release: cut the v9.0.0-next.4 release

This avoids warning such as the following ([example][1]):

```
warn: Invalid tags found -
  doc "platform-browser/ɵBROWSER_SANITIZATION_PROVIDERS__POST_R3__" (const)
  from file "platform-browser/src/browser.ts"
```

[1]: https://circleci.com/gh/angular/angular/427064

PR Close #32207

.bazelrc

@@ -36,22 +36,6 @@ build --incompatible_strict_action_env
 run --incompatible_strict_action_env
 test --incompatible_strict_action_env
 
-###############################
-# Saucelabs support           #
-# Turn on these settings with #
-#  --config=saucelabs         #
-###############################
-
-# Expose SauceLabs environment to actions
-# These environment variables are needed by
-# web_test_karma to run on Saucelabs
-test:saucelabs --action_env=SAUCE_USERNAME
-test:saucelabs --action_env=SAUCE_ACCESS_KEY
-test:saucelabs --action_env=SAUCE_READY_FILE
-test:saucelabs --action_env=SAUCE_PID_FILE
-test:saucelabs --action_env=SAUCE_TUNNEL_IDENTIFIER
-test:saucelabs --define=KARMA_WEB_TEST_MODE=SL_REQUIRED
-
 ###############################
 # Release support             #
 # Turn on these settings with #
@@ -78,7 +62,7 @@ test --test_output=errors
 # Settings for CircleCI        #
 ################################
 
-# Bazel flags for CircleCI are in /.circleci/bazel.rc
+# Bazel flags for CircleCI are in /.circleci/bazel.linux.rc and /.circleci/bazel.windows.rc
 
 ################################
 # Temporary Settings for Ivy   #
@@ -162,6 +146,11 @@ build --incompatible_list_based_execution_strategy_selection=false
 test --incompatible_list_based_execution_strategy_selection=false
 run --incompatible_list_based_execution_strategy_selection=false
 
+# Use workers for tsc and ngc when building locally.
+# This config is overwritten on CI to as the worker strategy causes flakes on CI.
+build --strategy=AngularTemplateCompile=worker
+build --strategy=TypeScriptCompile=worker
+
 ####################################################
 # User bazel configuration
 # NOTE: This needs to be the *last* entry in the config.

.circleci/bazel.common.rc

@@ -1,28 +1,13 @@
-# These options are enabled when running on CI
-# We do this by copying this file to /etc/bazel.bazelrc at the start of the build.
-# See documentation in /docs/BAZEL.md
-
-# Save downloaded repositories in a location that can be cached by CircleCI. This helps us
-# speeding up the analysis time significantly with Bazel managed node dependencies on the CI.
-build --repository_cache=/home/circleci/bazel_repository_cache
+# Settings in this file should be OS agnostic. Use the bazel.<OS>.rc files for OS specific settings.
 
 # Don't be spammy in the logs
-# TODO(gmagolan): Hide progress again once build performance improves
-# Presently, CircleCI can timeout during bazel test ... with the following
-# error: Too long with no output (exceeded 10m0s)
-# build --noshow_progress
+build --noshow_progress
 
 # Print all the options that apply to the build.
 # This helps us diagnose which options override others
 # (e.g. /etc/bazel.bazelrc vs. tools/bazel.rc)
 build --announce_rc
 
-# Workaround https://github.com/bazelbuild/bazel/issues/3645
-# Bazel doesn't calculate the memory ceiling correctly when running under Docker.
-# Limit Bazel to consuming resources that fit in CircleCI "xlarge" class
-# https://circleci.com/docs/2.0/configuration-reference/#resource_class
-build --local_resources=14336,8.0,1.0
-
 # Retry in the event of flakes, eg. https://circleci.com/gh/angular/angular/31309
 test --flaky_test_attempts=2
 

.circleci/bazel.linux.rc

@@ -0,0 +1,17 @@
+# These options are enabled when running on CI
+# We do this by copying this file to /etc/bazel.bazelrc at the start of the build.
+# See documentation in /docs/BAZEL.md
+
+# Import config items common to both Linux and Windows setups.
+# https://docs.bazel.build/versions/master/guide.html#bazelrc-syntax-and-semantics
+import %workspace%/.circleci/bazel.common.rc
+
+# Save downloaded repositories in a location that can be cached by CircleCI. This helps us
+# speeding up the analysis time significantly with Bazel managed node dependencies on the CI.
+build --repository_cache=/home/circleci/bazel_repository_cache
+
+# Workaround https://github.com/bazelbuild/bazel/issues/3645
+# Bazel doesn't calculate the memory ceiling correctly when running under Docker.
+# Limit Bazel to consuming resources that fit in CircleCI "xlarge" class
+# https://circleci.com/docs/2.0/configuration-reference/#resource_class
+build --local_resources=14336,8.0,1.0

.circleci/bazel.windows.rc

@@ -0,0 +1,11 @@
+# These options are enabled when running on CI
+# We do this by copying this file to $env:ProgramData\bazel.bazelrc at the start of the build.
+# See documentation in /docs/BAZEL.md
+
+# Import config items common to both Linux and Windows setups.
+# https://docs.bazel.build/versions/master/guide.html#bazelrc-syntax-and-semantics
+import %workspace%/.circleci/bazel.common.rc
+
+# Save downloaded repositories in a location that can be cached by CircleCI. This helps us
+# speeding up the analysis time significantly with Bazel managed node dependencies on the CI.
+build --repository_cache=C:/Users/circleci/bazel_repository_cache

.circleci/config.yml

@@ -27,6 +27,7 @@ var_2: &browsers_docker_image circleci/node:10.16-browsers
 # **NOTE 2 **: Keep the static part of the cache key as prefix to enable correct fallbacks.
 # See https://circleci.com/docs/2.0/caching/#restoring-cache for how prefixes work in CircleCI.
 var_3: &cache_key v3-angular-node-10.16-{{ checksum "yarn.lock" }}-{{ checksum "WORKSPACE" }}-{{ checksum "packages/bazel/package.bzl" }}-{{ checksum "aio/yarn.lock" }}
+var_3_win: &cache_key_win v4-angular-win-node-12.0-{{ checksum "yarn.lock" }}-{{ checksum "WORKSPACE" }}-{{ checksum "packages/bazel/package.bzl" }}-{{ checksum "aio/yarn.lock" }}
 
 # Initializes the CI environment by setting up common environment variables.
 var_4: &init_environment
@@ -48,6 +49,12 @@ var_4: &init_environment
       git config --global url."ssh://git@github.com".insteadOf "https://github.com" || true
       git config --global gc.auto 0 || true
 
+var_4_win: &init_environment_win
+  run:
+    # Install Bazel pre-requisites that aren't in the preconfigured CircleCI Windows VM.
+    name: Setup windows node environment
+    command: ./.circleci/windows-env.ps1
+
 
 var_5: &setup_bazel_remote_execution
   run:
@@ -65,6 +72,24 @@ var_6: &job_defaults
   working_directory: ~/ng
   docker:
   - image: *default_docker_image
+var_6_win: &job_defaults_win
+  working_directory: ~/ng
+  resource_class: windows.medium
+  # CircleCI windows VMs do have the GitBash shell available:
+  # https://github.com/CircleCI-Public/windows-preview-docs#shells
+  # But in this specific case we really should not use it because Bazel must not be ran from
+  # GitBash. These issues discuss why:
+  # https://github.com/bazelbuild/bazel/issues/5751
+  # https://github.com/bazelbuild/bazel/issues/5724#issuecomment-410194038
+  # https://github.com/bazelbuild/bazel/issues/6339#issuecomment-441600879
+  shell: powershell.exe -ExecutionPolicy Bypass
+  machine:
+    # Preview image that includes the following:
+    # - Visual Studio 2019 build tools
+    # - Node 12
+    # - yarn 1.17
+    # - Python 3 3.7.4
+    image: windows-server-2019-vs2019:201908-02
 
 # After checkout, rebase on top of target branch.
 var_7: &post_checkout
@@ -80,6 +105,17 @@ var_7: &post_checkout
       else
         echo "This build is not over a PR, nothing to do."
       fi
+var_7_win: &post_checkout_win
+  run:
+    name: Rebase PR on target branch
+    command: >
+      if (Test-Path env:CIRCLE_PR_NUMBER) {
+        git config user.name "angular-ci"
+        git config user.email "angular-ci"
+        node tools\rebase-pr.js angular/angular-cli $env:CIRCLE_PR_NUMBER
+      } else {
+        echo "This build is not over a PR, nothing to do."
+      }
 
 var_8: &yarn_install
   run:
@@ -95,7 +131,12 @@ var_8: &yarn_install
 var_9: &setup_circleci_bazel_config
   run:
     name: Setting up CircleCI bazel configuration
-    command: sudo cp .circleci/bazel.rc /etc/bazel.bazelrc
+    command: sudo cp .circleci/bazel.linux.rc $HOME/.bazelrc
+
+var_9_win: &setup_circleci_bazel_config_win
+  run:
+    name: Setting up CircleCI bazel configuration
+    command: copy .circleci\bazel.windows.rc $env:USERPROFILE\.bazelrc
 
 var_10: &restore_cache
   restore_cache:
@@ -103,6 +144,12 @@ var_10: &restore_cache
       - *cache_key
       # This fallback should be the cache_key without variables.
       - v3-angular-node-10.16-
+var_10_win: &restore_cache_win
+  restore_cache:
+    keys:
+      - *cache_key_win
+      # This fallback should be the cache_key without variables.
+      - v4-angular-win-node-12.0-
 
 # Branch filter that can be specified for jobs that should only run on publish branches
 # (e.g. master or the patch branch)
@@ -143,7 +190,7 @@ var_14: &notify_dev_infra_on_fail
 
 # Cache key for the Material unit tests job. **Note** when updating the SHA in the cache keys,
 # also update the SHA for the "MATERIAL_REPO_COMMIT" environment variable.
-var_15: &material_unit_tests_cache_key v4-angular-material-097f4335a4e0b6e6b579829ae3a9cffce6292d2b
+var_15: &material_unit_tests_cache_key v4-angular-material-18b9ef3f5529f0fa8f034944681486447af7b879
 var_16: &material_unit_tests_cache_key_short v4-angular-material
 
 version: 2
@@ -197,14 +244,9 @@ jobs:
       - *setup_circleci_bazel_config
       # Setup remote execution and run RBE-compatible tests.
       - *setup_bazel_remote_execution
-      - run: yarn bazel test //... --build_tag_filters=-ivy-only --test_tag_filters=-ivy-only
-      - run: mkdir ~/testlogs
-      - run: cp -Lr dist/testlogs/* ~/testlogs
-      - store_test_results:
-          # Bazel always writes test.xml files under this directory
-          path: ~/testlogs
-      - store_artifacts:
-          path: ~/testlogs
+      - run:
+          command: yarn bazel test //... --build_tag_filters=-ivy-only --test_tag_filters=-ivy-only
+          no_output_timeout: 20m
 
   # Temporary job to test what will happen when we flip the Ivy flag to true
   test_ivy_aot:
@@ -219,7 +261,9 @@ jobs:
         # We need to explicitly specify the --symlink_prefix option because otherwise we would
         # not be able to easily find the output bin directory when uploading artifacts for size
         # measurements.
-      - run: yarn test-ivy-aot //... --symlink_prefix=dist/
+      - run:
+          command: yarn test-ivy-aot //... --symlink_prefix=dist/
+          no_output_timeout: 20m
 
         # Publish bundle artifacts which will be used to calculate the size change. **Note**: Make
         # sure that the size plugin from the Angular robot fetches the artifacts from this CircleCI
@@ -256,23 +300,20 @@ jobs:
       - *init_environment
       - *setup_circleci_bazel_config
       - run:
-          name: Preparing environment for running tests on Saucelabs.
-          command: setSecretVar SAUCE_ACCESS_KEY $(echo $SAUCE_ACCESS_KEY | rev)
-      - run:
-          name: Starting Saucelabs tunnel
-          command: ./scripts/saucelabs/start-tunnel.sh
-          background: true
-        # Waits for the Saucelabs tunnel to be ready. This ensures that we don't run tests
-        # too early without Saucelabs not being ready.
-      - run: ./scripts/saucelabs/wait-for-tunnel.sh
-        # All web tests are contained within a single //:test_web_all target for Saucelabs
-        # as running each set of tests as a separate target will attempt to acquire too
-        # many browsers on Saucelabs (7 per target currently) and some tests will always
-        # fail to acquire browsers. For example:
-        # 14 02 2019 19:52:33.170:WARN [launcher]: chrome beta on SauceLabs have not captured in 180000 ms, killing.
-        # //packages/forms/test:web_test_sauce TIMEOUT in 315.0s
-      - run: yarn bazel test --config=saucelabs //:test_web_all
-      - run: ./scripts/saucelabs/stop-tunnel.sh
+          name: Run Bazel tests in saucelabs
+          # All web tests are contained within a single //:test_web_all target for Saucelabs
+          # as running each set of tests as a separate target will attempt to acquire too
+          # many browsers on Saucelabs (7 per target currently) and some tests will always
+          # fail to acquire browsers. For example:
+          # 14 02 2019 19:52:33.170:WARN [launcher]: chrome beta on SauceLabs have not captured in 180000 ms, killing.
+          # //packages/forms/test:web_test_sauce TIMEOUT in 315.0s
+          command:  |
+            ./scripts/saucelabs/run-bazel-via-tunnel.sh \
+              --tunnel-id angular-${CIRCLE_BUILD_NUM}-${CIRCLE_NODE_INDEX} \
+              --username $SAUCE_USERNAME \
+              --key $(echo $SAUCE_ACCESS_KEY | rev) \
+              yarn bazel test //:test_web_all
+          no_output_timeout: 20m
       - *notify_dev_infra_on_fail
 
   test_aio:
@@ -669,11 +710,63 @@ jobs:
              cp dist/bin/packages/zone.js/npm_package/dist/zone-patch-electron.js ./packages/zone.js/test/extra/ &&
              yarn --cwd packages/zone.js electrontest
 
+  # Windows jobs
+  # Docs: https://circleci.com/docs/2.0/hello-world-windows/
+  # Skipping workspace for now because it fails to extract on windows.
+  # TODO: when CircleCI fixes it, split this single job into install/test ones.
+  # Notes:
+  # - windows needs its own cache key because binaries in node_modules are different.
+  # - windows might need its own workspace for the same reason.
+  test_win:
+    <<: *job_defaults_win
+    steps:
+      - checkout
+      - *init_environment_win
+      - *post_checkout_win
+      # TODO: windows cache restoration is currently failing. Re-enable when it's fixed.
+      # Example failure: https://circleci.com/gh/angular/angular/423738
+      # - *restore_cache_win
+      - *setup_circleci_bazel_config_win
+      - run: yarn install --frozen-lockfile --non-interactive
+      # Install @bazel/bazel globally and use that for the first run.
+      # Workaround for https://github.com/bazelbuild/rules_nodejs/issues/894
+      - run: yarn global add @bazel/bazel@$env:BAZEL_VERSION
+      - run: bazel info
+      # Ran into a command parsing problem where `-browser:chromium-local` was converted to
+      # `-browser: chromium-local` (a space was added) in https://circleci.com/gh/angular/angular/357511.
+      # Probably a powershell command parsing thing. This way there's no problem.
+      - run:
+          command: yarn circleci-win-ve
+          no_output_timeout: 45m
+      # - save_cache:
+      #     key: *cache_key_win
+      #     paths:
+      #       - "node_modules"
+      #       - "C:/Users/circleci/bazel_repository_cache"
+  test_ivy_aot_win:
+    <<: *job_defaults_win
+    steps:
+      - checkout
+      - *init_environment_win
+      - *post_checkout_win
+      # - *restore_cache_win
+      - *setup_circleci_bazel_config_win
+      - run: yarn install --frozen-lockfile --non-interactive
+      - run: yarn global add @bazel/bazel@$env:BAZEL_VERSION
+      - run: bazel info
+      - run:
+          command: yarn circleci-win-ivy
+          no_output_timeout: 45m
+
+
 workflows:
   version: 2
   default_workflow:
     jobs:
-      - setup
+      - setup:
+          filters:
+            branches:
+              ignore: g3
       - lint:
           requires:
             - setup
@@ -766,6 +859,25 @@ workflows:
       - test_zonejs:
           requires:
             - setup
+      # Windows jobs very slow so we run it on non-PRs only for now.
+      # TODO: remove the filter when CircleCI makes Windows FS faster.
+      # The Windows jobs are only run after their non-windows counterparts finish successfully.
+      # This isn't strictly necessary as there is no artifact dependency, but helps economize
+      # CI resources by not attempting to build when we know should fail.
+      - test_win:
+          requires:
+            - test
+          filters:
+            branches:
+              ignore:
+                - /pull\/.*/
+      - test_ivy_aot_win:
+          requires:
+            - test_ivy_aot
+          filters:
+            branches:
+              ignore:
+                - /pull\/.*/
 
   aio_monitoring:
     jobs:
@@ -784,9 +896,3 @@ workflows:
             branches:
               only:
                 - master
-
-# TODO:
-# - don't build the g3 branch
-# - verify that we are bootstrapping with the right yarn version coming from the docker image
-# - check local chrome version pulled from docker image
-# - remove /tools/ngcontainer

.circleci/env.sh

@@ -61,6 +61,7 @@ else
   setPublicVar SAUCE_USERNAME "angular-ci";
   setSecretVar SAUCE_ACCESS_KEY "9b988f434ff8-fbca-8aa4-4ae3-35442987";
 fi
+# TODO(josephperrott): Remove environment variables once all saucelabs tests are via bazel method.
 setPublicVar SAUCE_LOG_FILE /tmp/angular/sauce-connect.log
 setPublicVar SAUCE_READY_FILE /tmp/angular/sauce-connect-ready-file.lock
 setPublicVar SAUCE_PID_FILE /tmp/angular/sauce-connect-pid-file.lock
@@ -79,7 +80,7 @@ setPublicVar MATERIAL_REPO_TMP_DIR "/tmp/material2"
 setPublicVar MATERIAL_REPO_URL "https://github.com/angular/material2.git"
 setPublicVar MATERIAL_REPO_BRANCH "master"
 # **NOTE**: When updating the commit SHA, also update the cache key in the CircleCI "config.yml".
-setPublicVar MATERIAL_REPO_COMMIT "097f4335a4e0b6e6b579829ae3a9cffce6292d2b"
+setPublicVar MATERIAL_REPO_COMMIT "18b9ef3f5529f0fa8f034944681486447af7b879"
 
 # Source `$BASH_ENV` to make the variables available immediately.
 source $BASH_ENV;

.circleci/windows-env.ps1

@@ -0,0 +1,47 @@
+# Install Bazel pre-reqs on Windows
+# https://docs.bazel.build/versions/master/install-windows.html
+# https://docs.bazel.build/versions/master/windows.html
+# Install MSYS2 and packages
+choco install msys2 --version 20180531.0.0 --no-progress --package-parameters "/NoUpdate"
+C:\tools\msys64\usr\bin\bash.exe -l -c "pacman --needed --noconfirm -S zip unzip patch diffutils git"
+
+# Add PATH modifications to the Powershell profile. This is the win equivalent of .bash_profile.
+# https://docs.microsoft.com/en-us/previous-versions//bb613488(v=vs.85)
+new-item -path $profile -itemtype file -force
+# Paths for nodejs, npm, yarn, and msys2. Use single quotes to prevent interpolation.
+# Add before the original path to use msys2 instead of the installed gitbash.
+Add-Content $profile '$Env:path = "${Env:ProgramFiles}\nodejs\;C:\Users\circleci\AppData\Roaming\npm\;${Env:ProgramFiles(x86)}\Yarn\bin\;C:\Users\circleci\AppData\Local\Yarn\bin\;C:\tools\msys64\usr\bin\;" + $Env:path'
+# Environment variables for Bazel
+Add-Content $profile '$Env:BAZEL_SH = "C:\tools\msys64\usr\bin\bash.exe"'
+
+# Get the bazel version devdep and store it in a global var for use in the circleci job.
+$bazelVersion = & ${Env:ProgramFiles}\nodejs\node.exe -e "console.log(require('./package.json').devDependencies['@bazel/bazel'])"
+# This is a tricky situation: we want $bazelVersion to be evaluated but not $Env:BAZEL_VERSION.
+# Formatting works https://stackoverflow.com/questions/32127583/expand-variable-inside-single-quotes
+$bazelVersionGlobalVar = '$Env:BAZEL_VERSION = "{0}"' -f $bazelVersion
+Add-Content $profile $bazelVersionGlobalVar
+
+# Remove the CircleCI checkout SSH override, because it breaks cloning repositories through Bazel.
+# See https://circleci.com/gh/angular/angular/401454 for an example.
+# TODO: is this really needed? Maybe there's a better way. It doesn't happen on Linux or on Codefresh.
+git config --global --unset url.ssh://git@github.com.insteadOf
+
+# Print node and yarn versions.
+echo "Node version:"
+node -v
+echo "Yarn version:"
+yarn -v
+
+
+# These Bazel prereqs aren't needed because the CircleCI image already includes them.
+# choco install nodejs --version 10.16.0 --no-progress
+# choco install yarn --version 1.16.0 --no-progress
+# choco install vcredist2015 --version 14.0.24215.20170201
+
+# We don't need VS Build Tools for the tested bazel targets.
+# If it's needed again, uncomment these lines.
+# VS Build Tools are needed for Bazel C++ targets (like com_google_protobuf)
+# choco install visualstudio2019buildtools --version 16.1.2.0 --no-progress --package-parameters "--add Microsoft.VisualStudio.Workload.VCTools --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 --add Microsoft.Component.VC.Runtime.UCRTSDK --add Microsoft.VisualStudio.Component.Windows10SDK.17763"
+# Add-Content $profile '$Env:BAZEL_VC = "${Env:ProgramFiles(x86)}\Microsoft Visual Studio\2019\BuildTools\VC\"'
+# Python is needed for Bazel Python targets
+# choco install python --version 3.5.1 --no-progress

.github/CODEOWNERS

@@ -101,7 +101,6 @@
 #
 #   - brandonroberts
 #   - gkalpak
-#   - jenniferfell
 #   - petebacondarwin
 
 

.gitignore

@@ -20,6 +20,8 @@ pubspec.lock
 *.swo
 modules/.settings
 modules/.vscode
+.vimrc
+.nvimrc
 
 # Don't check in secret files
 *secret.js

CHANGELOG.md

@@ -1,3 +1,102 @@
+<a name="9.0.0-next.4"></a>
+# [9.0.0-next.4](https://github.com/angular/angular/compare/9.0.0-next.3...9.0.0-next.4) (2019-08-28)
+
+
+### Bug Fixes
+
+* **ivy:** debug node names should match user declaration ([#32328](https://github.com/angular/angular/issues/32328)) ([14feb56](https://github.com/angular/angular/commit/14feb56))
+* **ivy:** ngtsc throws if "flatModuleOutFile" is set to null ([#32235](https://github.com/angular/angular/issues/32235)) ([4f7c971](https://github.com/angular/angular/commit/4f7c971))
+* **ivy:** reset binding index before executing a template in `refreshView` call ([#32201](https://github.com/angular/angular/issues/32201)) ([6b245a3](https://github.com/angular/angular/commit/6b245a3))
+* **ngcc:** do not analyze dependencies for non Angular entry-points ([#32303](https://github.com/angular/angular/issues/32303)) ([e563d77](https://github.com/angular/angular/commit/e563d77)), closes [#32302](https://github.com/angular/angular/issues/32302)
+
+
+### Features
+
+* **core:** add undecorated classes with decorated fields schematic ([#32130](https://github.com/angular/angular/issues/32130)) ([904a201](https://github.com/angular/angular/commit/904a201))
+* **ivy:** use the schema registry to check DOM bindings ([#32171](https://github.com/angular/angular/issues/32171)) ([0677cf0](https://github.com/angular/angular/commit/0677cf0))
+
+
+### Performance Improvements
+
+* **ivy:** minimise writes to the lView[BINDING_INDEX] / binding root ([#32263](https://github.com/angular/angular/issues/32263)) ([e3422e0](https://github.com/angular/angular/commit/e3422e0))
+* **ivy:** store binding metadata in the ngDevMode only ([#32317](https://github.com/angular/angular/issues/32317)) ([0874bf4](https://github.com/angular/angular/commit/0874bf4))
+
+
+
+
+<a name="8.2.4"></a>
+## [8.2.4](https://github.com/angular/angular/compare/8.2.3...8.2.4) (2019-08-28)
+
+This release contains various API docs improvements.
+
+
+
+<a name="9.0.0-next.3"></a>
+# [9.0.0-next.3](https://github.com/angular/angular/compare/9.0.0-next.2...9.0.0-next.3) (2019-08-21)
+
+
+### Bug Fixes
+
+* **bazel:** pin `[@microsoft](https://github.com/microsoft)/api-extractor` ([#32187](https://github.com/angular/angular/issues/32187)) ([5da5ca5](https://github.com/angular/angular/commit/5da5ca5))
+* **common:** update $locationShim to notify onChange listeners before emitting AngularJS events ([#32037](https://github.com/angular/angular/issues/32037)) ([5064dc7](https://github.com/angular/angular/commit/5064dc7))
+* **compiler:** return enableIvy true when using `readConfiguration` ([#32234](https://github.com/angular/angular/issues/32234)) ([424ab48](https://github.com/angular/angular/commit/424ab48))
+* **ivy:** get name directly from nativeNode ([#32198](https://github.com/angular/angular/issues/32198)) ([3dbc4ab](https://github.com/angular/angular/commit/3dbc4ab))
+* **ivy:** handle empty bindings in template type checker ([#31594](https://github.com/angular/angular/issues/31594)) ([0db1b5d](https://github.com/angular/angular/commit/0db1b5d)), closes [#30076](https://github.com/angular/angular/issues/30076) [#30929](https://github.com/angular/angular/issues/30929)
+* **ivy:** in ngcc, handle inline exports in commonjs code ([#32129](https://github.com/angular/angular/issues/32129)) ([02bab8c](https://github.com/angular/angular/commit/02bab8c))
+* **ivy:** ngcc should only index .d.ts exports within the package ([#32129](https://github.com/angular/angular/issues/32129)) ([964d726](https://github.com/angular/angular/commit/964d726))
+* **ivy:** ngTemplateOutlet error when switching between null and template value ([#32160](https://github.com/angular/angular/issues/32160)) ([c2868de](https://github.com/angular/angular/commit/c2868de)), closes [#32060](https://github.com/angular/angular/issues/32060)
+* **ivy:** run template type-checking for all components ([#31952](https://github.com/angular/angular/issues/31952)) ([bfc26bc](https://github.com/angular/angular/commit/bfc26bc))
+* **language-service:** Instantiate MetadataResolver once ([#32145](https://github.com/angular/angular/issues/32145)) ([6a0b1d5](https://github.com/angular/angular/commit/6a0b1d5))
+* **language-service:** Remove 'context' used for module resolution ([#32015](https://github.com/angular/angular/issues/32015)) ([a91ab15](https://github.com/angular/angular/commit/a91ab15))
+* **ngcc:** handle deep imports that already have an extension ([#32181](https://github.com/angular/angular/issues/32181)) ([4bbf16e](https://github.com/angular/angular/commit/4bbf16e)), closes [#32097](https://github.com/angular/angular/issues/32097)
+* **ngcc:** ignore format properties that exist but are undefined ([#32205](https://github.com/angular/angular/issues/32205)) ([f8b995d](https://github.com/angular/angular/commit/f8b995d)), closes [#32052](https://github.com/angular/angular/issues/32052) [#32188](https://github.com/angular/angular/issues/32188)
+
+
+### Features
+
+* **core:** add undecorated classes migration schematic ([#31650](https://github.com/angular/angular/issues/31650)) ([024c31d](https://github.com/angular/angular/commit/024c31d))
+* **forms:** formControlName also accepts a number ([#30606](https://github.com/angular/angular/issues/30606)) ([628b0c1](https://github.com/angular/angular/commit/628b0c1))
+* **compiler:** allow selector-less directives as base classes in View Engine ([#31379](https://github.com/angular/angular/issues/31379)) ([4055150](https://github.com/angular/angular/commit/4055150))
+* **ivy:** support selector-less directive as base classes in Ivy ([#32125](https://github.com/angular/angular/issues/32125)) ([cfed0c0](https://github.com/angular/angular/commit/cfed0c0)), closes [#31379](https://github.com/angular/angular/issues/31379)
+* **ivy:** make the Ivy compiler the default for ngc ([#32219](https://github.com/angular/angular/issues/32219)) ([ec4381d](https://github.com/angular/angular/commit/ec4381d))
+* **ivy:** convert all ngtsc diagnostics to ts.Diagnostics ([#31952](https://github.com/angular/angular/issues/31952)) ([0287b23](https://github.com/angular/angular/commit/0287b23))
+
+
+### Performance Improvements
+
+* **core:** make sanitization tree-shakable in Ivy mode ([#31934](https://github.com/angular/angular/issues/31934)) ([2e4d17f](https://github.com/angular/angular/commit/2e4d17f))
+* **ivy:** auto-call select(0) for non-empty views only ([#32131](https://github.com/angular/angular/issues/32131)) ([4d549f6](https://github.com/angular/angular/commit/4d549f6))
+* **ivy:** avoid first template pass checks during view creation ([#32120](https://github.com/angular/angular/issues/32120)) ([4c3b791](https://github.com/angular/angular/commit/4c3b791))
+* **ivy:** avoid for-of loops at runtime ([#32157](https://github.com/angular/angular/issues/32157)) ([abb44f7](https://github.com/angular/angular/commit/abb44f7))
+* **ivy:** improve NaN checks in change detection ([#32212](https://github.com/angular/angular/issues/32212)) ([53bfa7c](https://github.com/angular/angular/commit/53bfa7c))
+* **ivy:** interpolation micro-benchmark ([#32104](https://github.com/angular/angular/issues/32104)) ([be665d8](https://github.com/angular/angular/commit/be665d8))
+* **ivy:** noop change detection micro-benchmark ([#32104](https://github.com/angular/angular/issues/32104)) ([c422c72](https://github.com/angular/angular/commit/c422c72))
+* don't create holey arrays ([#32155](https://github.com/angular/angular/issues/32155)) ([6477057](https://github.com/angular/angular/commit/6477057))
+* **ivy:** read selected index only when need in prop bindings ([#32212](https://github.com/angular/angular/issues/32212)) ([53f33c1](https://github.com/angular/angular/commit/53f33c1))
+* **ivy:** split hooks processing into init and check phases ([#32131](https://github.com/angular/angular/issues/32131)) ([1062960](https://github.com/angular/angular/commit/1062960))
+* **ivy:** split view processing into render (create) and refresh (update) pass ([#32020](https://github.com/angular/angular/issues/32020)) ([b9dfe66](https://github.com/angular/angular/commit/b9dfe66))
+
+
+### BREAKING CHANGES
+
+Angular now compiles with Ivy by default ([#32219](https://github.com/angular/angular/issues/32219)) ([ec4381d](https://github.com/angular/angular/commit/ec4381d)). 
+
+If you aren't familiar with Ivy, read our [blog post about the Ivy preview](https://blog.angular.io/its-time-for-the-compatibility-opt-in-preview-of-ivy-38f3542a282f?gi=8bfeb44b05c) and see the list of changes [here](https://docs.google.com/document/d/1Dije0AsJ0PxL3NaeNPxpYDeapj30b_QC0xfeIvIIzgg/preview).
+
+* **ivy:** make Hammer support tree-shakable. Previously, in Ivy applications, Hammer providers were included by default. With this commit, apps that want Hammer support must import `HammerModule`in their root module. ([#32203](https://github.com/angular/angular/issues/32203)) ([de8ebbd](https://github.com/angular/angular/commit/de8ebbd))
+
+
+
+<a name="8.2.3"></a>
+## [8.2.3](https://github.com/angular/angular/compare/8.2.2...8.2.3) (2019-08-21)
+
+
+### Bug Fixes
+
+* **bazel:** pin `[@microsoft](https://github.com/microsoft)/api-extractor` ([#32187](https://github.com/angular/angular/issues/32187)) ([a7b9478](https://github.com/angular/angular/commit/a7b9478))
+
+
+
 <a name="9.0.0-next.2"></a>
 # [9.0.0-next.2](https://github.com/angular/angular/compare/9.0.0-next.1...9.0.0-next.2) (2019-08-12)
 

CONTRIBUTING.md

@@ -233,6 +233,7 @@ There are currently a few exceptions to the "use package name" rule:
 * **docs-infra**: used for docs-app (angular.io) related changes within the /aio directory of the
   repo
 * **ivy**: used for changes to the [Ivy renderer](https://github.com/angular/angular/issues/21706).
+* **ngcc**: used for changes to the [Angular Compatibility Compiler](./packages/compiler-cli/ngcc/README.md)
 * none/empty string: useful for `style`, `test` and `refactor` changes that are done across all
   packages (e.g. `style: add missing semicolons`) and for docs changes that are not related to a
   specific package (e.g. `docs: fix typo in tutorial`).

README.md

@@ -6,7 +6,7 @@
 
 # Angular
 
-Angular is a development platform for building mobile and desktop web applications using Typescript/JavaScript and other languages.
+Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages.
 
 ## Quickstart
 
@@ -14,7 +14,7 @@ Angular is a development platform for building mobile and desktop web applicatio
 
 ## Changelog
 
-[Learn about the latest improvements][changelog]. 
+[Learn about the latest improvements][changelog].
 
 ## Want to help?
 

aio/README.md

@@ -46,6 +46,15 @@ Here are the most important tasks you might need to use:
   - `yarn example-e2e --filter=foo` - limit e2e tests to those containing the word "foo"
   - `yarn example-e2e --setup --local` - run e2e tests with the local version of Angular contained in the "dist" folder
 
+> **Note for Windows users**
+>
+> Setting up the examples involves creating some [symbolic links](https://en.wikipedia.org/wiki/Symbolic_link) (see [here](./tools/examples/README.md#symlinked-node_modules) for details). On Windows, this requires to either have [Developer Mode enabled](https://blogs.windows.com/windowsdeveloper/2016/12/02/symlinks-windows-10) (supported on Windows 10 or newer) or run the setup commands as administrator.
+>
+> The affected commands are:
+> - `yarn setup` / `yarn setup-*`
+> - `yarn build` / `yarn build-*`
+> - `yarn boilerplate:add`
+> - `yarn example-e2e --setup`
 
 ## Using ServiceWorker locally
 

aio/content/examples/getting-started/src/app/cart/cart.component.3.ts

@@ -1,6 +1,6 @@
 // #docplaster
 // #docregion imports
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 import { CartService } from '../cart.service';
 // #enddocregion imports
 
@@ -10,12 +10,14 @@ import { CartService } from '../cart.service';
   styleUrls: ['./cart.component.css']
 })
 // #docregion props-services, submit
-export class CartComponent {
+export class CartComponent implements OnInit {
   items;
 
   constructor(
     private cartService: CartService
-  ) {
+  ) { }
+
+  ngOnInit() {
     this.items = this.cartService.getItems();
   }
 }

aio/content/examples/getting-started/src/app/shipping/shipping.component.ts

@@ -1,6 +1,6 @@
 // #docplaster
 // #docregion imports
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 
 import { CartService } from '../cart.service';
 // #enddocregion
@@ -11,7 +11,7 @@ import { CartService } from '../cart.service';
   styleUrls: ['./shipping.component.css']
 })
 // #docregion props, ctor
-export class ShippingComponent {
+export class ShippingComponent implements OnInit {
   shippingCosts;
 // #enddocregion props
 
@@ -19,10 +19,12 @@ export class ShippingComponent {
   constructor(
     private cartService: CartService
   ) {
-// #enddocregion inject-cart-service
-    this.shippingCosts = this.cartService.getShippingPrices();
-// #docregion inject-cart-service
   }
 // #enddocregion inject-cart-service
+
+  ngOnInit() {
+    this.shippingCosts = this.cartService.getShippingPrices();
+  }
+
 // #docregion props
 }

aio/content/examples/http/src/app/app.component.html

@@ -1,6 +1,6 @@
 <h1>HTTP Sample</h1>
 <div>
-  <input type="checkbox" id="heroes" [checked]="toggleHeroes" (click)="toggleHeroes()">
+  <input type="checkbox" id="heroes" [checked]="showHeroes" (click)="toggleHeroes()">
   <label for="heroes">Heroes</label>
 
   <input type="checkbox" id="config" [checked]="showConfig" (click)="toggleConfig()">

aio/content/examples/i18n/doc-files/main.2.ts

@@ -12,7 +12,7 @@ if (environment.production) {
 // use the require method provided by webpack
 declare const require;
 // we use the webpack raw-loader to return the content as a string
-const translations = require(`raw-loader!./locale/messages.fr.xlf`);
+const translations = require('raw-loader!./locale/messages.fr.xlf').default;
 
 platformBrowserDynamic().bootstrapModule(AppModule, {
   providers: [

aio/content/examples/providers-viewproviders/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,24 @@
+import { browser, element, by } from 'protractor';
+import { logging } from 'selenium-webdriver';
+
+describe('Providers and ViewProviders', function () {
+
+
+  beforeEach(() => {
+    browser.get('');
+  });
+
+  it('shows basic flower emoji', function() {
+    expect(element.all(by.css('p')).get(0).getText()).toContain('🌺');
+  });
+
+  it('shows whale emoji', function() {
+    expect(element.all(by.css('p')).get(1).getText()).toContain('🐳');
+  });
+
+  it('shows sunflower from FlowerService', function() {
+    expect(element.all(by.css('p')).get(8).getText()).toContain('🌻');
+  });
+
+});
+

aio/content/examples/providers-viewproviders/src/app/animal.service.ts

@@ -0,0 +1,10 @@
+// #docregion animal-service
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AnimalService {
+  emoji = '🐳';
+}
+// #enddocregion animal-service

aio/content/examples/providers-viewproviders/src/app/app.component.1.ts

@@ -0,0 +1,15 @@
+import { Component } from '@angular/core';
+import { FlowerService } from './flower.service';
+import { AnimalService } from './animal.service';
+
+
+@Component({
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+  styleUrls: [ './app.component.css' ]
+})
+// #docregion injection
+export class AppComponent  {
+  constructor(public flower: FlowerService) {}
+}
+// #enddocregion injection

aio/content/examples/providers-viewproviders/src/app/app.component.html

@@ -0,0 +1,15 @@
+
+<h2>From AppComponent:</h2>
+<!-- #docregion binding-flower -->
+<p>Emoji from FlowerService: {{flower.emoji}}</p>
+<!-- #enddocregion binding-flower -->
+<!-- #docregion binding-animal -->
+<p>Emoji from AnimalService: {{animal.emoji}}</p>
+<!-- #enddocregion binding-animal -->
+
+<hr />
+
+<h2>From ChildComponent:</h2>
+<!-- #docregion content-projection -->
+<app-child><app-inspector></app-inspector></app-child>
+<!-- #enddocregion content-projection -->

aio/content/examples/providers-viewproviders/src/app/app.component.ts

@@ -0,0 +1,15 @@
+import { Component } from '@angular/core';
+import { FlowerService } from './flower.service';
+import { AnimalService } from './animal.service';
+
+
+@Component({
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+  styleUrls: [ './app.component.css' ]
+})
+// #docregion inject-animal-service
+export class AppComponent  {
+  constructor(public flower: FlowerService, public animal: AnimalService) {}
+}
+// #enddocregion inject-animal-service

aio/content/examples/providers-viewproviders/src/app/app.module.ts

@@ -0,0 +1,17 @@
+import { NgModule } from '@angular/core';
+import { BrowserModule } from '@angular/platform-browser';
+import { FormsModule } from '@angular/forms';
+
+import { AppComponent } from './app.component';
+import { ChildComponent } from './child/child.component';
+import { InspectorComponent } from './inspector/inspector.component';
+
+// #docregion appmodule
+@NgModule({
+  imports:      [ BrowserModule, FormsModule ],
+  declarations: [ AppComponent, ChildComponent, InspectorComponent ],
+  bootstrap:    [ AppComponent ],
+  providers: []
+})
+export class AppModule { }
+// #enddocregion appmodule

aio/content/examples/providers-viewproviders/src/app/child/child.component.1.ts

@@ -0,0 +1,19 @@
+import { Component, OnInit, Host, SkipSelf, Optional } from '@angular/core';
+import { FlowerService } from '../flower.service';
+
+// #docregion flowerservice
+@Component({
+  selector: 'app-child',
+  templateUrl: './child.component.html',
+  styleUrls: ['./child.component.css'],
+  // use the providers array to provide a service
+  providers: [{ provide: FlowerService, useValue: { emoji: '🌻' } }]
+})
+
+export class ChildComponent {
+  // inject the service
+  constructor( public flower: FlowerService) { }
+}
+
+// #enddocregion flowerservice
+

aio/content/examples/providers-viewproviders/src/app/child/child.component.css

@@ -0,0 +1,4 @@
+.container {
+  border: 1px solid darkblue;
+  padding: 1rem;
+}

aio/content/examples/providers-viewproviders/src/app/child/child.component.html

@@ -0,0 +1,24 @@
+<!-- #docplaster -->
+<!-- #docregion child-component -->
+<!-- #docregion flower-binding -->
+<p>Emoji from FlowerService: {{flower.emoji}}</p>
+<!-- #enddocregion flower-binding -->
+<!-- #docregion animal-binding -->
+<p>Emoji from AnimalService: {{animal.emoji}}</p>
+<!-- #enddocregion animal-binding -->
+
+<div class="container">
+  <h3>Content projection</h3>
+  <!-- #enddocregion child-component -->
+  <p>The following is coming from content. It doesn't get to see the puppy because the puppy is declared inside the view only.</p>
+  <!-- #docregion child-component -->
+	<ng-content></ng-content>
+</div>
+
+<h3>Inside the view</h3>
+<!-- #enddocregion child-component -->
+<p>The following is inside the view so it does see the puppy.</p>
+<!-- #docregion child-component -->
+<app-inspector></app-inspector>
+<!-- #enddocregion child-component -->
+

aio/content/examples/providers-viewproviders/src/app/child/child.component.ts

@@ -0,0 +1,44 @@
+// #docplaster
+import { Component, OnInit, Host, SkipSelf, Optional } from '@angular/core';
+import { FlowerService } from '../flower.service';
+import { AnimalService } from '../animal.service';
+
+// #docregion provide-animal-service
+@Component({
+  selector: 'app-child',
+  templateUrl: './child.component.html',
+  styleUrls: ['./child.component.css'],
+  // provide services
+  providers: [{ provide: FlowerService, useValue: { emoji: '🌻' } }],
+  viewProviders: [{ provide: AnimalService, useValue: { emoji: '🐶' } }]
+})
+
+export class ChildComponent {
+  // inject service
+  constructor( public flower: FlowerService, public animal: AnimalService) { }
+// #enddocregion provide-animal-service
+
+  // viewProviders ensures that only the view gets to see this.
+  // With the AnimalService in the viewProviders, the
+  // InspectorComponent doesn't get to see it because the
+  // inspector is in the content.
+
+
+  // constructor( public flower: FlowerService, @Optional() @Host()  public animal: AnimalService) { }
+
+// Comment out the above constructor and alternately
+// uncomment the two following constructors to see the
+// effects of @Host() and @Host() + @SkipSelf().
+
+// constructor(
+//     @Host() public animal : AnimalService,
+//     @Host() @Optional() public flower : FlowerService) { }
+
+// constructor(
+//     @SkipSelf() @Host() public animal : AnimalService,
+//     @SkipSelf() @Host() @Optional() public flower : FlowerService) { }
+
+// #docregion provide-animal-service
+}
+// #enddocregion provide-animal-service
+

aio/content/examples/providers-viewproviders/src/app/flower.service.ts

@@ -0,0 +1,11 @@
+import { Injectable } from '@angular/core';
+
+// #docregion flowerservice
+@Injectable({
+  providedIn: 'root'
+})
+export class FlowerService {
+  emoji = '🌺';
+}
+// #enddocregion flowerservice
+

aio/content/examples/providers-viewproviders/src/app/inspector/inspector.component.html

@@ -0,0 +1,4 @@
+ <!-- #docregion binding -->
+<p>Emoji from FlowerService: {{flower.emoji}}</p>
+<p>Emoji from AnimalService: {{animal.emoji}}</p>
+ <!-- #enddocregion binding -->

aio/content/examples/providers-viewproviders/src/app/inspector/inspector.component.ts

@@ -0,0 +1,14 @@
+import { Component } from '@angular/core';
+import { FlowerService } from '../flower.service';
+import { AnimalService } from '../animal.service';
+
+@Component({
+  selector: 'app-inspector',
+  templateUrl: './inspector.component.html',
+  styleUrls: ['./inspector.component.css']
+})
+// #docregion injection
+export class InspectorComponent {
+  constructor(public flower: FlowerService, public animal: AnimalService) { }
+}
+// #enddocregion injection

aio/content/examples/providers-viewproviders/src/index.html

@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>providers vs. viewProviders</title>
+  <base href="/">
+
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="favicon.ico">
+</head>
+<body>
+  <app-root></app-root>
+</body>
+</html>

aio/content/examples/providers-viewproviders/src/main.ts

@@ -0,0 +1,12 @@
+import { enableProdMode } from '@angular/core';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+import { AppModule } from './app/app.module';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+platformBrowserDynamic().bootstrapModule(AppModule)
+  .catch(err => console.log(err));

aio/content/examples/providers-viewproviders/stackblitz.json

@@ -0,0 +1,10 @@
+{
+  "description": "Inputs and Outputs",
+  "files": [
+    "!**/*.d.ts",
+    "!**/*.js",
+    "!**/*.[1,2].*"
+  ],
+  "file": "src/app/app.component.ts",
+  "tags": ["Inputs and Outputs"]
+}

aio/content/examples/resolution-modifiers/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,21 @@
+import { browser, element, by } from 'protractor';
+
+describe('Resolution-modifiers-example', function () {
+
+  beforeAll(function () {
+    browser.get('');
+  });
+
+  it('shows basic flower emoji', function() {
+    expect(element.all(by.css('p')).get(0).getText()).toContain('🌸');
+  });
+
+  it('shows basic leaf emoji', function() {
+    expect(element.all(by.css('p')).get(1).getText()).toContain('🌿');
+  });
+
+  it('shows yellow flower in host child', function() {
+    expect(element.all(by.css('p')).get(9).getText()).toContain('🌼');
+  });
+
+});

aio/content/examples/resolution-modifiers/src/app/app.component.html

@@ -0,0 +1,14 @@
+<h1>DI resolution modifiers</h1>
+
+<p>Basic flower service: {{flower.emoji}}</p>
+<p>Basic leaf service: {{leaf.emoji}}</p>
+
+<app-optional></app-optional>
+
+<app-self></app-self>
+
+<app-self-no-data></app-self-no-data>
+
+<app-skipself></app-skipself>
+
+<app-host-parent></app-host-parent>

aio/content/examples/resolution-modifiers/src/app/app.component.ts

@@ -0,0 +1,13 @@
+import { Component } from '@angular/core';
+import { LeafService } from './leaf.service';
+import { FlowerService } from './flower.service';
+
+@Component({
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+  styleUrls: [ './app.component.css' ]
+})
+export class AppComponent {
+  name = 'Angular';
+  constructor(public flower: FlowerService, public leaf: LeafService) {}
+}

aio/content/examples/resolution-modifiers/src/app/app.module.ts

@@ -0,0 +1,33 @@
+;
+import { OptionalComponent } from './optional/optional.component';
+import { NgModule } from '@angular/core';
+import { BrowserModule } from '@angular/platform-browser';
+import { FormsModule } from '@angular/forms';
+
+import { AppComponent } from './app.component';
+import { SelfNoDataComponent } from './self-no-data/self-no-data.component';
+import { HostComponent } from './host/host.component';
+import { SelfComponent } from './self/self.component';
+import { SkipselfComponent } from './skipself/skipself.component';
+import { HostParentComponent } from './host-parent/host-parent.component';
+import { HostChildComponent } from './host-child/host-child.component';
+
+@NgModule({
+  imports: [
+    BrowserModule,
+    FormsModule
+  ],
+  declarations: [
+    AppComponent,
+    OptionalComponent,
+    SelfComponent,
+    SelfNoDataComponent,
+    HostComponent,
+    SkipselfComponent,
+    HostParentComponent,
+    HostChildComponent
+  ],
+  bootstrap: [AppComponent],
+  providers: []
+})
+export class AppModule { }

aio/content/examples/resolution-modifiers/src/app/flower.service.ts

@@ -0,0 +1,9 @@
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root' // provide this service in the root ModuleInjector
+
+})
+export class FlowerService {
+  emoji = '🌸';
+}

aio/content/examples/resolution-modifiers/src/app/host-child/host-child.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/host-child/host-child.component.html

@@ -0,0 +1,4 @@
+<div class="section">
+	<h2>Child of @Host() Component</h2>
+  <p>Flower emoji: {{flower.emoji}}</p>
+</div>

aio/content/examples/resolution-modifiers/src/app/host-child/host-child.component.ts

@@ -0,0 +1,11 @@
+import { Component } from '@angular/core';
+import { FlowerService } from '../flower.service';
+
+@Component({
+  selector: 'app-host-child',
+  templateUrl: './host-child.component.html',
+  styleUrls: ['./host-child.component.css']
+})
+export class HostChildComponent {
+  constructor(public flower: FlowerService) { }
+}

aio/content/examples/resolution-modifiers/src/app/host-parent/host-parent.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/host-parent/host-parent.component.html

@@ -0,0 +1,5 @@
+<div class="section">
+	<h2>Parent of @Host() Component</h2>
+	<p>Flower emoji: {{flower.emoji}}</p>
+	<app-host></app-host>
+</div>

aio/content/examples/resolution-modifiers/src/app/host-parent/host-parent.component.ts

@@ -0,0 +1,16 @@
+import { Component } from '@angular/core';
+import { FlowerService } from '../flower.service';
+
+
+@Component({
+  selector: 'app-host-parent',
+  templateUrl: './host-parent.component.html',
+  styleUrls: ['./host-parent.component.css'],
+  providers: [{ provide: FlowerService, useValue: { emoji: '🌺' } }]
+
+})
+export class HostParentComponent {
+
+  constructor(public flower: FlowerService) { }
+
+}

aio/content/examples/resolution-modifiers/src/app/host/host.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/host/host.component.html

@@ -0,0 +1,6 @@
+<div class="section">
+	<h2>@Host() Component</h2>
+	<p>Flower emoji: {{flower.emoji}}</p>
+	<p><i>(@Host() stops it here)</i></p>
+	<app-host-child></app-host-child>
+</div>

aio/content/examples/resolution-modifiers/src/app/host/host.component.ts

@@ -0,0 +1,21 @@
+import { Component, Host, Optional } from '@angular/core';
+import { FlowerService } from '../flower.service';
+
+// #docregion host-component
+@Component({
+  selector: 'app-host',
+  templateUrl: './host.component.html',
+  styleUrls: ['./host.component.css'],
+  //  provide the service
+  providers: [{ provide: FlowerService, useValue: { emoji: '🌼' } }]
+})
+export class HostComponent {
+  // use @Host() in the constructor when injecting the service
+  constructor(@Host() @Optional() public flower: FlowerService) { }
+
+}
+// #enddocregion host-component
+
+// if you take out @Host() and the providers array, flower will be red hibiscus
+
+

aio/content/examples/resolution-modifiers/src/app/leaf.service.ts

@@ -0,0 +1,11 @@
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+// #docregion leafservice
+export class LeafService {
+  emoji = '🌿';
+}
+// #enddocregion leafservice
+

aio/content/examples/resolution-modifiers/src/app/optional.service.ts

@@ -0,0 +1,7 @@
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class OptionalService {
+}
+
+// This service isn't provided anywhere.

aio/content/examples/resolution-modifiers/src/app/optional/optional.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/optional/optional.component.html

@@ -0,0 +1,4 @@
+<div class="section">
+	<h2>@Optional() Component</h2>
+	<p>This component still works even though the OptionalService (notice @Optional() in the consturctor isn't provided or configured anywhere. Angular goes through tree and visibilty rules, and if it doesn't find the requested service, returns null.</p>
+</div>

aio/content/examples/resolution-modifiers/src/app/optional/optional.component.ts

@@ -0,0 +1,21 @@
+import { Component, Optional } from '@angular/core';
+import { OptionalService } from '../optional.service';
+
+@Component({
+  selector: 'app-optional',
+  templateUrl: './optional.component.html',
+  styleUrls: ['./optional.component.css']
+})
+
+// #docregion optional-component
+export class OptionalComponent {
+  constructor(@Optional() public optional: OptionalService) {}
+}
+// #enddocregion optional-component
+
+// The OptionalService isn't provided here, in the @Injectable()
+// providers array, or in the NgModule. If you remove @Optional()
+// from the constructor, you'll get an error.
+
+
+

aio/content/examples/resolution-modifiers/src/app/self-no-data/self-no-data.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/self-no-data/self-no-data.component.html

@@ -0,0 +1,4 @@
+<div class="section">
+	<h2>@Self() Component (without a provider)</h2>
+  <p>Leaf emoji: {{leaf?.emoji}}</p>
+</div>

aio/content/examples/resolution-modifiers/src/app/self-no-data/self-no-data.component.ts

@@ -0,0 +1,18 @@
+import { Component, Self, Optional } from '@angular/core';
+import { LeafService } from '../leaf.service';
+
+// #docregion self-no-data-component
+@Component({
+  selector: 'app-self-no-data',
+  templateUrl: './self-no-data.component.html',
+  styleUrls: ['./self-no-data.component.css']
+})
+export class SelfNoDataComponent {
+  constructor(@Self() @Optional() public leaf: LeafService) { }
+}
+
+// #enddocregion self-no-data-component
+
+// The app doesn't break because the value being available at self is optional.
+// If you remove @Optional(), the app breaks.
+

aio/content/examples/resolution-modifiers/src/app/self/self.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/self/self.component.html

@@ -0,0 +1,4 @@
+<div class="section">
+	<h2>@Self() Component</h2>
+  <p>Flower emoji: {{flower?.emoji}}</p>
+</div>

aio/content/examples/resolution-modifiers/src/app/self/self.component.ts

@@ -0,0 +1,19 @@
+import { Component, Self } from '@angular/core';
+import { FlowerService } from '../flower.service';
+
+// #docregion self-component
+@Component({
+  selector: 'app-self',
+  templateUrl: './self.component.html',
+  styleUrls: ['./self.component.css'],
+  providers: [{ provide: FlowerService, useValue: { emoji: '🌼' } }]
+
+})
+export class SelfComponent {
+  constructor(@Self() public flower: FlowerService) {}
+}
+// #enddocregion self-component
+
+// This component provides the FlowerService so the injector
+// doesn't have to look further up the injector tree
+

aio/content/examples/resolution-modifiers/src/app/skipself/skipself.component.css

@@ -0,0 +1,5 @@
+.section {
+  border: 2px solid #369;
+  padding: 1rem;
+  margin: 1rem 0;
+}

aio/content/examples/resolution-modifiers/src/app/skipself/skipself.component.html

@@ -0,0 +1,4 @@
+<div class="section">
+	<h2>@SkipSelf() Component</h2>
+  <p>Leaf emoji: {{leaf.emoji}}</p>
+</div>

aio/content/examples/resolution-modifiers/src/app/skipself/skipself.component.ts

@@ -0,0 +1,18 @@
+import { Component, SkipSelf } from '@angular/core';
+import { LeafService } from '../leaf.service';
+
+// #docregion skipself-component
+@Component({
+  selector: 'app-skipself',
+  templateUrl: './skipself.component.html',
+  styleUrls: ['./skipself.component.css'],
+  // Angular would ignore this LeafService instance
+  providers: [{ provide: LeafService, useValue: { emoji: '🍁' } }]
+})
+export class SkipselfComponent {
+  // Use @SkipSelf() in the constructor
+  constructor(@SkipSelf() public leaf: LeafService) { }
+}
+// #enddocregion skipself-component
+
+// @SkipSelf(): Specifies that the dependency resolution should start from the parent injector, not here.

aio/content/examples/resolution-modifiers/src/index.html

@@ -0,0 +1,14 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>DI Resolution Modifiers Example</title>
+  <base href="/">
+
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="favicon.ico">
+</head>
+<body>
+  <app-root>Loading...</app-root>
+</body>
+</html>

aio/content/examples/resolution-modifiers/src/main.ts

@@ -0,0 +1,11 @@
+import { enableProdMode } from '@angular/core';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+import { AppModule } from './app/app.module';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+platformBrowserDynamic().bootstrapModule(AppModule);

aio/content/examples/resolution-modifiers/stackblitz.json

@@ -0,0 +1,10 @@
+{
+  "description": "NgModules",
+  "files": [
+    "!**/*.d.ts",
+    "!**/*.js",
+    "!**/*.[1,2].*"
+  ],
+  "file": "src/app/app.component.ts",
+  "tags": ["NgModules"]
+}

aio/content/examples/upgrade-phonecat-1-typescript/tsconfig.json

@@ -6,7 +6,10 @@
     "sourceMap": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "lib": [ "es2015", "dom" ],
+    "lib": [
+      "es2015",
+      "dom"
+    ],
     "noImplicitAny": true,
     "skipLibCheck": true,
     "suppressImplicitAnyIndexErrors": true
@@ -16,5 +19,8 @@
     "node_modules/*",
     "**/*-aot.ts",
     "aot/**/*"
-  ]
-}
+  ],
+  "angularCompilerOptions": {
+    "enableIvy": false
+  }
+}

aio/content/examples/upgrade-phonecat-2-hybrid/tsconfig-aot.json

@@ -19,6 +19,7 @@
   ],
 
   "angularCompilerOptions": {
-    "skipMetadataEmit" : true
+    "skipMetadataEmit" : true,
+    "enableIvy": false,
  }
 }

aio/content/examples/upgrade-phonecat-2-hybrid/tsconfig.json

@@ -6,7 +6,10 @@
     "sourceMap": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "lib": [ "es2015", "dom" ],
+    "lib": [
+      "es2015",
+      "dom"
+    ],
     "noImplicitAny": true,
     "skipLibCheck": true,
     "suppressImplicitAnyIndexErrors": true
@@ -15,5 +18,8 @@
   "exclude": [
     "node_modules/*",
     "**/*-aot.ts"
-  ]
-}
+  ],
+  "angularCompilerOptions": {
+    "enableIvy": false
+  }
+}

aio/content/examples/upgrade-phonecat-3-final/tsconfig.json

@@ -6,7 +6,10 @@
     "sourceMap": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "lib": [ "es2015", "dom" ],
+    "lib": [
+      "es2015",
+      "dom"
+    ],
     "noImplicitAny": true,
     "skipLibCheck": true,
     "suppressImplicitAnyIndexErrors": true
@@ -15,5 +18,8 @@
   "exclude": [
     "node_modules/*",
     "**/*-aot.ts"
-  ]
-}
+  ],
+  "angularCompilerOptions": {
+    "enableIvy": false
+  }
+}

aio/content/examples/visual-studio-2015/tsconfig.json

@@ -13,5 +13,8 @@
       "node_modules/@types"
     ]
   },
-  "compileOnSave": true
-}
+  "compileOnSave": true,
+  "angularCompilerOptions": {
+    "enableIvy": false
+  }
+}

aio/content/guide/accessibility.md

@@ -99,7 +99,7 @@ The following example shows how to make a simple progress bar accessible by usin
 
       // Sets the minimum and maximum values for the progressbar role.
        'aria-valuemin': '0',
-       'aria-valuemax': '0',
+       'aria-valuemax': '100',
 
        // Binding that updates the current value of the progressbar.
        '[attr.aria-valuenow]': 'value',

aio/content/guide/angular-compiler-options.md

@@ -1,6 +1,6 @@
 # Angular compiler options
 
-When you use [AOT compilation](guide/aot-compiler), you can control how your application is compiled by specifying *template* compiler options in the `tsconfig.json` [TypeScript configuration file](guide/typescript-configuration).
+When you use [AoT compilation](guide/aot-compiler), you can control how your application is compiled by specifying *template* compiler options in the `tsconfig.json` [TypeScript configuration file](guide/typescript-configuration).
 
 The template options object, `angularCompilerOptions`, is a sibling to the `compilerOptions` object that supplies standard options to the TypeScript compiler.
 
@@ -17,7 +17,38 @@ The template options object, `angularCompilerOptions`, is a sibling to the `comp
       }
   }
   ```
-This page describes the available Angular template compiler options.
+
+{@a tsconfig-extends}
+## Configuration inheritance with extends
+
+Like the TypeScript compiler, The Angular AoT compiler also supports `extends` in the `angularCompilerOptions` section of the TypeScript configuration file, `tsconfig.json`.
+The `extends` property is at the top level, parallel to `compilerOptions` and `angularCompilerOptions`.
+
+A TypeScript configuration can inherit settings from another file using the `extends` property.
+The configuration options from the base file are loaded first, then overridden by those in the inheriting `tsconfig` file.
+
+For example:
+
+```json
+{
+  "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "experimentalDecorators": true,
+    ...
+  },
+  "angularCompilerOptions": {
+    "fullTemplateTypeCheck": true,
+    "preserveWhitespaces": true,
+    ...
+  }
+}
+```
+
+For more informaton, see the [TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/tsconfig-json.html).
+
+## Template options
+
+The following options are available for configuring the AoT template compiler.
 
 ### `allowEmptyCodegenFiles`
 
@@ -29,7 +60,7 @@ Modifies how Angular-specific annotations are emitted to improve tree-shaking. N
 
 * By default, the compiler replaces decorators with a static field in the class, which allows advanced tree-shakers like [Closure compiler](https://github.com/google/closure-compiler) to remove unused classes.
 
-* The `decorators` value leaves the decorators in place, which makes compilation faster. TypeScript emits calls to the` __decorate` helper. Use `--emitDecoratorMetadata` for runtime reflection (but note taht the resulting code will not properly tree-shake.
+* The `decorators` value leaves the decorators in place, which makes compilation faster. TypeScript emits calls to the` __decorate` helper. Use `--emitDecoratorMetadata` for runtime reflection (but note that the resulting code will not properly tree-shake.
 
 ### `annotateForClosureCompiler`
 

aio/content/guide/animations.md

@@ -260,7 +260,7 @@ What it does
 </tr>
 
 <tr>
-<td><code>state()</code></td>
+<td><code><a href="api/animations/state" class="code-anchor">state()</a></code></td>
 <td>Creates a named set of CSS styles that should be applied on successful transition to a given state. The state can then be referenced by name within other animation functions.</td>
 </tr>
 
@@ -280,7 +280,7 @@ What it does
 </tr>
 
 <tr>
-<td><code>group()</code></td>
+<td><code><a href="api/animations/group" class="code-anchor">group()</a></code></td>
 <td>Specifies a group of animation steps (<em>inner animations</em>) to be run in parallel. Animation continues only after all inner animation steps have completed. Used within <code>sequence()</code> or <code>transition().</code></td>
 </tr>
 

aio/content/guide/aot-metadata-errors.md

@@ -0,0 +1,540 @@
+# AoT metadata errors
+
+The following are metadata errors you may encounter, with explanations and suggested corrections.
+
+[Expression form not supported](#expression-form-not-supported)<br>
+[Reference to a local (non-exported) symbol](#reference-to-a-local-symbol)<br>
+[Only initialized variables and constants](#only-initialized-variables)<br>
+[Reference to a non-exported class](#reference-to-a-non-exported-class)<br>
+[Reference to a non-exported function](#reference-to-a-non-exported-function)<br>
+[Function calls are not supported](#function-calls-not-supported)<br>
+[Destructured variable or constant not supported](#destructured-variable-not-supported)<br>
+[Could not resolve type](#could-not-resolve-type)<br>
+[Name expected](#name-expected)<br>
+[Unsupported enum member name](#unsupported-enum-member-name)<br>
+[Tagged template expressions are not supported](#tagged-template-expressions-not-supported)<br>
+[Symbol reference expected](#symbol-reference-expected)<br>
+
+<hr>
+
+{@a expression-form-not-supported}
+## Expression form not supported
+
+<div class="alert is-helpful">
+
+*The compiler encountered an expression it didn't understand while evaluating Angular metadata.*
+
+</div>
+
+Language features outside of the compiler's [restricted expression syntax](guide/aot-compiler#expression-syntax)
+can produce this error, as seen in the following example:
+
+```ts
+// ERROR
+export class Fooish { ... }
+...
+const prop = typeof Fooish; // typeof is not valid in metadata
+  ...
+  // bracket notation is not valid in metadata
+  { provide: 'token', useValue: { [prop]: 'value' } };
+  ...
+```
+
+You can use `typeof` and bracket notation in normal application code.
+You just can't use those features within expressions that define Angular metadata.
+
+Avoid this error by sticking to the compiler's [restricted expression syntax](guide/aot-compiler#expression-syntax)
+when writing Angular metadata
+and be wary of new or unusual TypeScript features.
+
+<hr>
+
+{@a reference-to-a-local-symbol}
+## Reference to a local (non-exported) symbol
+
+<div class="alert is-helpful">
+
+_Reference to a local (non-exported) symbol 'symbol name'. Consider exporting the symbol._
+
+</div>
+
+The compiler encountered a referenced to a locally defined symbol that either wasn't exported or wasn't initialized.
+
+Here's a `provider` example of the problem.
+
+```ts
+// ERROR
+let foo: number; // neither exported nor initialized
+
+@Component({
+  selector: 'my-component',
+  template: ... ,
+  providers: [
+    { provide: Foo, useValue: foo }
+  ]
+})
+export class MyComponent {}
+```
+The compiler generates the component factory, which includes the `useValue` provider code, in a separate module. _That_ factory module can't reach back to _this_ source module to access the local (non-exported) `foo` variable.
+
+You could fix the problem by initializing `foo`.
+
+```ts
+let foo = 42; // initialized
+```
+
+The compiler will [fold](guide/aot-compiler#code-folding) the expression into the provider as if you had written this.
+
+```ts
+  providers: [
+    { provide: Foo, useValue: 42 }
+  ]
+```
+
+Alternatively, you can fix it by exporting `foo` with the expectation that `foo` will be assigned at runtime when you actually know its value.
+
+```ts
+// CORRECTED
+export let foo: number; // exported
+
+@Component({
+  selector: 'my-component',
+  template: ... ,
+  providers: [
+    { provide: Foo, useValue: foo }
+  ]
+})
+export class MyComponent {}
+```
+
+Adding `export` often works for variables referenced in metadata such as `providers` and `animations` because the compiler can generate _references_ to the exported variables in these expressions. It doesn't need the _values_ of those variables.
+
+Adding `export` doesn't work when the compiler needs the _actual value_
+in order to generate code.
+For example, it doesn't work for the `template` property.
+
+```ts
+// ERROR
+export let someTemplate: string; // exported but not initialized
+
+@Component({
+  selector: 'my-component',
+  template: someTemplate
+})
+export class MyComponent {}
+```
+
+The compiler needs the value of the `template` property _right now_ to generate the component factory.
+The variable reference alone is insufficient.
+Prefixing the declaration with `export` merely produces a new error, "[`Only initialized variables and constants can be referenced`](#only-initialized-variables)".
+
+<hr>
+
+{@a only-initialized-variables}
+## Only initialized variables and constants
+
+<div class="alert is-helpful">
+
+_Only initialized variables and constants can be referenced because the value of this variable is needed by the template compiler._
+
+</div>
+
+The compiler found a reference to an exported variable or static field that wasn't initialized.
+It needs the value of that variable to generate code.
+
+The following example tries to set the component's `template` property to the value of
+the exported `someTemplate` variable which is declared but _unassigned_.
+
+```ts
+// ERROR
+export let someTemplate: string;
+
+@Component({
+  selector: 'my-component',
+  template: someTemplate
+})
+export class MyComponent {}
+```
+
+You'd also get this error if you imported `someTemplate` from some other module and neglected to initialize it there.
+
+```ts
+// ERROR - not initialized there either
+import { someTemplate } from './config';
+
+@Component({
+  selector: 'my-component',
+  template: someTemplate
+})
+export class MyComponent {}
+```
+
+The compiler cannot wait until runtime to get the template information.
+It must statically derive the value of the `someTemplate` variable from the source code
+so that it can generate the component factory, which includes
+instructions for building the element based on the template.
+
+To correct this error, provide the initial value of the variable in an initializer clause _on the same line_.
+
+```ts
+// CORRECTED
+export let someTemplate = '<h1>Greetings from Angular</h1>';
+
+@Component({
+  selector: 'my-component',
+  template: someTemplate
+})
+export class MyComponent {}
+```
+
+<hr>
+
+{@a reference-to-a-non-exported-class}
+## Reference to a non-exported class
+
+<div class="alert is-helpful">
+
+_Reference to a non-exported class <class name>. Consider exporting the class._
+
+</div>
+
+Metadata referenced a class that wasn't exported.
+
+For example, you may have defined a class and used it as an injection token in a providers array
+but neglected to export that class.
+
+```ts
+// ERROR
+abstract class MyStrategy { }
+
+  ...
+  providers: [
+    { provide: MyStrategy, useValue: ... }
+  ]
+  ...
+```
+
+Angular generates a class factory in a separate module and that
+factory [can only access exported classes](guide/aot-compiler#exported-symbols).
+To correct this error, export the referenced class.
+
+```ts
+// CORRECTED
+export abstract class MyStrategy { }
+
+  ...
+  providers: [
+    { provide: MyStrategy, useValue: ... }
+  ]
+  ...
+```
+<hr>
+
+{@a reference-to-a-non-exported-function}
+## Reference to a non-exported function
+
+<div class="alert is-helpful">
+
+*Metadata referenced a function that wasn't exported.*
+
+</div>
+
+For example, you may have set a providers `useFactory` property to a locally defined function that you neglected to export.
+
+```ts
+// ERROR
+function myStrategy() { ... }
+
+  ...
+  providers: [
+    { provide: MyStrategy, useFactory: myStrategy }
+  ]
+  ...
+```
+
+Angular generates a class factory in a separate module and that
+factory [can only access exported functions](guide/aot-compiler#exported-symbols).
+To correct this error, export the function.
+
+```ts
+// CORRECTED
+export function myStrategy() { ... }
+
+  ...
+  providers: [
+    { provide: MyStrategy, useFactory: myStrategy }
+  ]
+  ...
+```
+<hr>
+
+{@a function-calls-not-supported}
+## Function calls are not supported
+
+<div class="alert is-helpful">
+
+_Function calls are not supported. Consider replacing the function or lambda with a reference to an exported function._
+
+</div>
+
+The compiler does not currently support [function expressions or lambda functions](guide/aot-compiler#function-expression).
+For example, you cannot set a provider's `useFactory` to an anonymous function or arrow function like this.
+
+```ts
+// ERROR
+  ...
+  providers: [
+    { provide: MyStrategy, useFactory: function() { ... } },
+    { provide: OtherStrategy, useFactory: () => { ... } }
+  ]
+  ...
+```
+You also get this error if you call a function or method in a provider's `useValue`.
+
+```ts
+// ERROR
+import { calculateValue } from './utilities';
+
+  ...
+  providers: [
+    { provide: SomeValue, useValue: calculateValue() }
+  ]
+  ...
+```
+
+To correct this error, export a function from the module and refer to the function in a `useFactory` provider instead.
+
+```ts
+// CORRECTED
+import { calculateValue } from './utilities';
+
+export function myStrategy() { ... }
+export function otherStrategy() { ... }
+export function someValueFactory() {
+  return calculateValue();
+}
+  ...
+  providers: [
+    { provide: MyStrategy, useFactory: myStrategy },
+    { provide: OtherStrategy, useFactory: otherStrategy },
+    { provide: SomeValue, useFactory: someValueFactory }
+  ]
+  ...
+```
+
+<hr>
+
+{@a destructured-variable-not-supported}
+## Destructured variable or constant not supported
+
+<div class="alert is-helpful">
+
+_Referencing an exported destructured variable or constant is not supported by the template compiler. Consider simplifying this to avoid destructuring._
+
+</div>
+
+The compiler does not support references to variables assigned by [destructuring](https://www.typescriptlang.org/docs/handbook/variable-declarations.html#destructuring).
+
+For example, you cannot write something like this:
+
+```ts
+// ERROR
+import { configuration } from './configuration';
+
+// destructured assignment to foo and bar
+const {foo, bar} = configuration;
+  ...
+  providers: [
+    {provide: Foo, useValue: foo},
+    {provide: Bar, useValue: bar},
+  ]
+  ...
+```
+
+To correct this error, refer to non-destructured values.
+
+```ts
+// CORRECTED
+import { configuration } from './configuration';
+  ...
+  providers: [
+    {provide: Foo, useValue: configuration.foo},
+    {provide: Bar, useValue: configuration.bar},
+  ]
+  ...
+```
+
+<hr>
+
+{@a could-not-resolve-type}
+## Could not resolve type
+
+<div class="alert is-helpful">
+
+*The compiler encountered a type and can't determine which module exports that type.*
+
+</div>
+
+This can happen if you refer to an ambient type.
+For example, the `Window` type is an ambient type declared in the global `.d.ts` file.
+
+You'll get an error if you reference it in the component constructor,
+which the compiler must statically analyze.
+
+```ts
+// ERROR
+@Component({ })
+export class MyComponent {
+  constructor (private win: Window) { ... }
+}
+```
+TypeScript understands ambient types so you don't import them.
+The Angular compiler does not understand a type that you neglect to export or import.
+
+In this case, the compiler doesn't understand how to inject something with the `Window` token.
+
+Do not refer to ambient types in metadata expressions.
+
+If you must inject an instance of an ambient type,
+you can finesse the problem in four steps:
+
+1. Create an injection token for an instance of the ambient type.
+1. Create a factory function that returns that instance.
+1. Add a `useFactory` provider with that factory function.
+1. Use `@Inject` to inject the instance.
+
+Here's an illustrative example.
+
+```ts
+// CORRECTED
+import { Inject } from '@angular/core';
+
+export const WINDOW = new InjectionToken('Window');
+export function _window() { return window; }
+
+@Component({
+  ...
+  providers: [
+    { provide: WINDOW, useFactory: _window }
+  ]
+})
+export class MyComponent {
+  constructor (@Inject(WINDOW) private win: Window) { ... }
+}
+```
+
+The `Window` type in the constructor is no longer a problem for the compiler because it
+uses the `@Inject(WINDOW)` to generate the injection code.
+
+Angular does something similar with the `DOCUMENT` token so you can inject the browser's `document` object (or an abstraction of it, depending upon the platform in which the application runs).
+
+```ts
+import { Inject }   from '@angular/core';
+import { DOCUMENT } from '@angular/platform-browser';
+
+@Component({ ... })
+export class MyComponent {
+  constructor (@Inject(DOCUMENT) private doc: Document) { ... }
+}
+```
+<hr>
+
+{@a name-expected}
+## Name expected
+
+<div class="alert is-helpful">
+
+*The compiler expected a name in an expression it was evaluating.*
+
+</div>
+
+This can happen if you use a number as a property name as in the following example.
+
+```ts
+// ERROR
+provider: [{ provide: Foo, useValue: { 0: 'test' } }]
+```
+
+Change the name of the property to something non-numeric.
+
+```ts
+// CORRECTED
+provider: [{ provide: Foo, useValue: { '0': 'test' } }]
+```
+
+<hr>
+
+{@a unsupported-enum-member-name}
+## Unsupported enum member name
+
+<div class="alert is-helpful">
+
+*Angular couldn't determine the value of the [enum member](https://www.typescriptlang.org/docs/handbook/enums.html) that you referenced in metadata.*
+
+</div>
+
+The compiler can understand simple enum values but not complex values such as those derived from computed properties.
+
+```ts
+// ERROR
+enum Colors {
+  Red = 1,
+  White,
+  Blue = "Blue".length // computed
+}
+
+  ...
+  providers: [
+    { provide: BaseColor,   useValue: Colors.White } // ok
+    { provide: DangerColor, useValue: Colors.Red }   // ok
+    { provide: StrongColor, useValue: Colors.Blue }  // bad
+  ]
+  ...
+```
+
+Avoid referring to enums with complicated initializers or computed properties.
+
+<hr>
+
+{@a tagged-template-expressions-not-supported}
+## Tagged template expressions are not supported
+
+<div class="alert is-helpful">
+
+_Tagged template expressions are not supported in metadata._
+
+</div>
+
+The compiler encountered a JavaScript ES2015 [tagged template expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals#Tagged_template_literals) such as the following.
+
+```ts
+// ERROR
+const expression = 'funky';
+const raw = String.raw`A tagged template ${expression} string`;
+ ...
+ template: '<div>' + raw + '</div>'
+ ...
+```
+[`String.raw()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/raw)
+is a _tag function_ native to JavaScript ES2015.
+
+The AoT compiler does not support tagged template expressions; avoid them in metadata expressions.
+
+<hr>
+
+{@a symbol-reference-expected}
+## Symbol reference expected
+
+<div class="alert is-helpful">
+
+*The compiler expected a reference to a symbol at the location specified in the error message.*
+
+</div>
+
+This error can occur if you use an expression in the `extends` clause of a class.
+
+<!--
+
+Chuck: After reviewing your PR comment I'm still at a loss. See [comment there](https://github.com/angular/angular/pull/17712#discussion_r132025495).
+
+-->

aio/content/guide/app-shell.md

@@ -21,11 +21,10 @@ For an existing application, you have to manually add the `RouterModule` and def
 Use the CLI to automatically create the app shell.
 
 <code-example language="bash">
-ng generate app-shell --client-project my-app --universal-project server-app
+ng generate app-shell --client-project my-app
 </code-example>
 
-* `my-app` takes the name of your client application.
-* `server-app` takes the name of the Universal (or server) application.
+* `client-project` takes the name of your client application.
 
 After running this command you will notice that the `angular.json` configuration file has been updated to add two new targets, with a few other changes.
 

aio/content/guide/dependency-injection.md

@@ -134,7 +134,7 @@ The `@NgModule()` and `@Component()` decorators have the `providers` metadata op
 
 Components are directives, and the `providers` option is inherited from `@Directive()`. You can also configure providers for directives and pipes at the same level as the component.
 
-Learn more about [where to configure providers](guide/hierarchical-dependency-injection#where-to-register).
+Learn more about [where to configure providers](guide/hierarchical-dependency-injection).
 
 </div>
 

aio/content/guide/deployment.md

@@ -8,7 +8,7 @@ When you are ready to deploy your Angular application to a remote server, you ha
 
 ## Simple deployment options
 
-Before fully deploying your application, you can test the process, build configuration, and deployed behavior by using one of these interim techniques
+Before fully deploying your application, you can test the process, build configuration, and deployed behavior by using one of these interim techniques.
 
 ### Building and serving from disk
 
@@ -41,7 +41,7 @@ You will need two terminals to get the live-reload experience.
 
   <code-example language="none" class="code-shell">
 
-   lite-server --baseDir="dist"
+   lite-server --baseDir="dist/project-name"
 
   </code-example>
 
@@ -53,6 +53,35 @@ This method is for development and testing only, and is not a supported or secur
 
 </div>
 
+### Automatic deployment with the CLI
+
+The Angular CLI command `ng deploy` (introduced in version 8.3.0) executes the `deploy` [CLI builder](https://angular.io/guide/cli-builder) associated with your project. A number of third-party builders implement deployment capabilities to different platforms. You can add any of them to your project by running `ng add [package name]`.
+
+When you add a package with deployment capability, it'll automatically update your workspace configuration (`angular.json` file) with a `deploy` section for the selected project. You can then use the `ng deploy` command to deploy that project.
+
+For example, the following command automatically deploys a project to Firebase.
+
+<code-example language="none" class="code-shell">
+ng add @angular/fire
+ng deploy
+</code-example>
+
+The command is interactive. In this case, you must have or create a Firebase account, and authenticate using that account. The command prompts you to select a Firebase project for deployment
+
+After the command produces an optimal build of your application (equivalent to `ng deploy --prod`), it'll upload the production assets to Firebase.
+
+In the table below, you can find a list of packages which implement deployment functionality to different platforms. The `deploy` command for each package may require different command line options. You can read more by following the links associated with the package names below:
+
+| Deployment to                                                 | Package                                                                        |
+|---------------------------------------------------------------|--------------------------------------------------------------------------------|
+| [Firebase hosting](https://firebase.google.com/docs/hosting)  | [`@angular/fire`](https://npmjs.org/package/@angular/fire)                     |
+| [Azure](https://azure.microsoft.com/en-us/)                   | [`@azure/ng-deploy`](https://npmjs.org/package/@azure/ng-deploy)               |
+| [Now](https://zeit.co/now)                                    | [`@zeit/ng-deploy`](https://npmjs.org/package/@zeit/ng-deploy)                 |
+| [Netlify](https://www.netlify.com/)                           | [`@netlify-builder/deploy`](https://npmjs.org/package/@netlify-builder/deploy) |
+| [GitHub pages](https://pages.github.com/)                     | [`angular-cli-ghpages`](https://npmjs.org/package/angular-cli-ghpages)         |
+
+If you're deploying to a self-managed server or there's no builder for your favorite cloud platform, you can either create a builder that allows you to use the `ng deploy` command, or read through this guide to learn how to manually deploy your app.
+
 ### Basic deployment to a remote server
 
 For the simplest deployment, create a production build and copy the output directory to a web server.

aio/content/guide/http.md

@@ -40,7 +40,7 @@ into an application class as shown in the following `ConfigService` example.
   header="app/config/config.service.ts (excerpt)">
 </code-example>
 
-## Getting JSON data
+## Requesting data from server
 
 Applications often request JSON data from the server.
 For example, the app might need a configuration file on the server, `config.json`,
@@ -73,45 +73,37 @@ the component **subscribes** to the method's return value.
 The subscription callback copies the data fields into the component's `config` object,
 which is data-bound in the component template for display.
 
-### Why write a service
+<div class="callout is-helpful">
+ <header>Why write a service?</header>
 
 This example is so simple that it is tempting to write the `Http.get()` inside the
 component itself and skip the service.
-
-However, data access rarely stays this simple.
-You typically post-process the data, add error handling, and maybe some retry logic to
+In practice, however, data access rarely stays this simple.
+You typically need to post-process the data, add error handling, and maybe some retry logic to
 cope with intermittent connectivity.
 
 The component quickly becomes cluttered with data access minutia.
 The component becomes harder to understand, harder to test, and the data access logic can't be re-used or standardized.
 
-That's why it is a best practice to separate presentation of data from data access by
+That's why it's a best practice to separate presentation of data from data access by
 encapsulating data access in a separate service and delegating to that service in
 the component, even in simple cases like this one.
+</div>
 
-### Type-checking the response
+### Requesting a typed response
 
-The subscribe callback above requires bracket notation to extract the data values.
+You can structure your `HttpClient` request to declare the type of the response object, to make consuming the output easier and more obvious.
+Specifying the response type acts as a type assertion during the compile time.
 
-<code-example
-  path="http/src/app/config/config.component.ts"
-  region="v1_callback">
-</code-example>
-
-You can't write `data.heroesUrl` because TypeScript correctly complains that the `data` object from the service does not have a `heroesUrl` property.
-
-The `HttpClient.get()` method parsed the JSON server response into the anonymous `Object` type. It doesn't know what the shape of that object is.
-
-You can tell `HttpClient` the type of the response to make consuming the output easier and more obvious.
-
-First, define an interface with the correct shape:
+To specify the response object type, first define an interface with the required properties.
+(Use an interface rather than a class; a response cannot be automatically converted to an instance of a class.)
 
 <code-example
   path="http/src/app/config/config.service.ts"
   region="config-interface">
 </code-example>
 
-Then, specify that interface as the `HttpClient.get()` call's type parameter in the service:
+Next, specify that interface as the `HttpClient.get()` call's type parameter in the service.
 
 <code-example
   path="http/src/app/config/config.service.ts"
@@ -119,6 +111,12 @@ Then, specify that interface as the `HttpClient.get()` call's type parameter in
   header="app/config/config.service.ts (getConfig v.2)">
 </code-example>
 
+<div class="alert is-helpful">
+
+ When you pass an interface as a type parameter to the `HttpClient.get()` method, use the RxJS `map` operator to transform the response data as needed by the UI. You can then pass the transformed data to the [async pipe](api/common/AsyncPipe).
+
+</div>
+
 The callback in the updated component method receives a typed data object, which is
 easier and safer to consume:
 
@@ -128,6 +126,24 @@ easier and safer to consume:
   header="app/config/config.component.ts (showConfig v.2)">
 </code-example>
 
+<div class="alert is-important">
+
+Specifying the response type is a declaration to TypeScript that it should expect your response to be of the given type.
+This is a build-time check and doesn't guarantee that the server will actually respond with an object of this type. It is up to the server to ensure that the type specified by the server API is returned.
+
+</div>
+
+To access properties that are defined in an interface, you must explicitly convert the Object you get from the JSON to the required response type.
+For example, the following `subscribe` callback receives `data` as an Object, and then type-casts it in order to access the properties.
+
+<code-example>
+   .subscribe(data => this.config = {
+    heroesUrl: (data as any).heroesUrl,
+    textfile:  (data as any).textfile,
+   });
+</code-example>
+
+
 ### Reading the full response
 
 The response body doesn't return all the data you may need. Sometimes servers return special headers or status codes to indicate certain conditions that are important to the application workflow.
@@ -139,7 +155,7 @@ Tell `HttpClient` that you want the full response with the `observe` option:
   region="getConfigResponse">
 </code-example>
 
-Now `HttpClient.get()` returns an `Observable` of typed `HttpResponse` rather than just the JSON data.
+Now `HttpClient.get()` returns an `Observable` of type `HttpResponse` rather than just the JSON data.
 
 The component's `showConfigResponse()` method displays the response headers as well as the configuration:
 
@@ -152,6 +168,54 @@ The component's `showConfigResponse()` method displays the response headers as w
 
 As you can see, the response object has a `body` property of the correct type.
 
+### Making a JSONP request
+
+Apps can use the the `HttpClient` to make [JSONP](https://en.wikipedia.org/wiki/JSONP) requests across domains when the server doesn't support [CORS protocol](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS).
+
+Angular JSONP requests return an `Observable`.
+Follow the pattern for subscribing to observables and use the RxJS `map` operator to transform the response before using the [async pipe](api/common/AsyncPipe) to manage the results.
+
+In Angular, use JSONP by including `HttpClientJsonpModule` in the `NgModule` imports.
+In the following example, the `searchHeroes()` method uses a JSONP request to query for heroes whose names contain the search term.
+
+```ts
+/* GET heroes whose name contains search term */
+searchHeroes(term: string): Observable {
+  term = term.trim();
+
+  let heroesURL = `${this.heroesURL}?${term}`;
+  return this.http.jsonp(heroesUrl, 'callback').pipe(
+      catchError(this.handleError('searchHeroes', []) // then handle the error
+    );
+};
+```
+
+This request passes the `heroesURL` as the first parameter and the callback function name as the second parameter.
+The response is wrapped in the callback function, which takes the observables returned by the JSONP method and pipes them through to the error handler.
+
+### Requesting non-JSON data
+
+Not all APIs return JSON data.
+In this next example, a `DownloaderService` method reads a text file from the server and logs the file contents, before returning those contents to the caller as an `Observable<string>`.
+
+<code-example
+  path="http/src/app/downloader/downloader.service.ts"
+  region="getTextFile"
+  header="app/downloader/downloader.service.ts (getTextFile)" linenums="false">
+</code-example>
+
+`HttpClient.get()` returns a string rather than the default JSON because of the `responseType` option.
+
+The RxJS `tap` operator (as in "wiretap") lets the code inspect both success and error values passing through the observable without disturbing them.
+
+A `download()` method in the `DownloaderComponent` initiates the request by subscribing to the service method.
+
+<code-example
+  path="http/src/app/downloader/downloader.component.ts"
+  region="download"
+  header="app/downloader/downloader.component.ts (download)" linenums="false">
+</code-example>
+
 ## Error handling
 
 What happens if the request fails on the server, or if a poor network connection prevents it from even reaching the server? `HttpClient` will return an _error_ object instead of a successful response.
@@ -204,7 +268,7 @@ and _pipe them through_ to the error handler.
   header="app/config/config.service.ts (getConfig v.3 with error handler)">
 </code-example>
 
-### `retry()`
+### Retrying
 
 Sometimes the error is transient and will go away automatically if you try again.
 For example, network interruptions are common in mobile scenarios, and trying again
@@ -242,29 +306,34 @@ If you're following along with these code snippets, note that you must import th
   header="app/config/config.service.ts (RxJS imports)">
 </code-example>
 
-## Requesting non-JSON data
+## HTTP headers
 
-Not all APIs return JSON data. In this next example,
-a `DownloaderService` method reads a text file from the server
-and logs the file contents, before returning those contents to the caller
-as an `Observable<string>`.
+Many servers require extra headers for save operations.
+For example, they may require a "Content-Type" header to explicitly declare the MIME type of the request body; or the server may require an authorization token.
+
+### Adding headers
+
+The `HeroesService` defines such headers in an `httpOptions` object that will be passed
+to every `HttpClient` save method.
 
 <code-example
-  path="http/src/app/downloader/downloader.service.ts"
-  region="getTextFile"
-  header="app/downloader/downloader.service.ts (getTextFile)">
+  path="http/src/app/heroes/heroes.service.ts"
+  region="http-options"
+  header="app/heroes/heroes.service.ts (httpOptions)">
 </code-example>
 
-`HttpClient.get()` returns a string rather than the default JSON because of the `responseType` option.
+### Updating headers
 
-The RxJS `tap` operator (as in "wiretap") lets the code inspect good and error values passing through the observable without disturbing them.
+You can't directly modify the existing headers within the previous options
+object because instances of the `HttpHeaders` class are immutable.
 
-A `download()` method in the `DownloaderComponent` initiates the request by subscribing to the service method.
+Use the `set()` method instead, to return a clone of the current instance with the new changes applied.
+
+Here's how you might update the authorization header (after the old token expired) before making the next request.
 
 <code-example
-  path="http/src/app/downloader/downloader.component.ts"
-  region="download"
-  header="app/downloader/downloader.component.ts (download)">
+  path="http/src/app/heroes/heroes.service.ts"
+   region="update-headers" linenums="false">
 </code-example>
 
 ## Sending data to the server
@@ -276,22 +345,6 @@ that fetches heroes and enables users to add, delete, and update them.
 
 The following sections excerpt methods of the sample's `HeroesService`.
 
-### Adding headers
-
-Many servers require extra headers for save operations.
-For example, they may require a "Content-Type" header to explicitly declare
-the MIME type of the request body.
-Or perhaps the server requires an authorization token.
-
-The `HeroesService` defines such headers in an `httpOptions` object that will be passed
-to every `HttpClient` save method.
-
-<code-example
-  path="http/src/app/heroes/heroes.service.ts"
-  region="http-options"
-  header="app/heroes/heroes.service.ts (httpOptions)">
-</code-example>
-
 ### Making a POST request
 
 Apps often POST data to a server. They POST when submitting a form.
@@ -413,118 +466,8 @@ in order to initiate the request.
 
 We have discussed the basic HTTP functionality in `@angular/common/http`, but sometimes you need to do more than make simple requests and get data back.
 
-### Configuring the request
-
-Other aspects of an outgoing request can be configured via the options object
-passed as the last argument to the `HttpClient` method.
-
-You [saw earlier](#adding-headers) that the `HeroesService` sets the default headers by
-passing an options object (`httpOptions`) to its save methods.
-You can do more.
-
-#### Update headers
-
-You can't directly modify the existing headers within the previous options
-object because instances of the `HttpHeaders` class are immutable.
-
-Use the `set()` method instead.
-It returns a clone of the current instance with the new changes applied.
-
-Here's how you might update the authorization header (after the old token expired)
-before making the next request.
-
-<code-example
-  path="http/src/app/heroes/heroes.service.ts"
-  region="update-headers">
-</code-example>
-
-#### URL Parameters
-
-Adding URL search parameters works a similar way.
-Here is a `searchHeroes` method that queries for heroes whose names contain the search term.
-
-<code-example
-  path="http/src/app/heroes/heroes.service.ts"
-  region="searchHeroes">
-</code-example>
-
-If there is a search term, the code constructs an options object with an HTML URL-encoded search parameter. If the term were "foo", the GET request URL would be `api/heroes/?name=foo`.
-
-The `HttpParams` are immutable so you'll have to use the `set()` method to update the options.
-
-### Debouncing requests
-
-The sample includes an _npm package search_ feature.
-
-When the user enters a name in a search-box, the `PackageSearchComponent` sends
-a search request for a package with that name to the NPM web API.
-
-Here's a pertinent excerpt from the template:
-
-<code-example
-  path="http/src/app/package-search/package-search.component.html"
-  region="search"
-  header="app/package-search/package-search.component.html (search)">
-</code-example>
-
-The `(keyup)` event binding sends every keystroke to the component's `search()` method.
-
-Sending a request for every keystroke could be expensive.
-It's better to wait until the user stops typing and then send a request.
-That's easy to implement with RxJS operators, as shown in this excerpt.
-
-<code-example
-  path="http/src/app/package-search/package-search.component.ts"
-  region="debounce"
-  header="app/package-search/package-search.component.ts (excerpt)">
-</code-example>
-
-The `searchText$` is the sequence of search-box values coming from the user.
-It's defined as an RxJS `Subject`, which means it is a multicasting `Observable`
-that can also produce values for itself by calling `next(value)`,
-as happens in the `search()` method.
-
-Rather than forward every `searchText` value directly to the injected `PackageSearchService`,
-the code in `ngOnInit()` _pipes_ search values through three operators:
-
-1. `debounceTime(500)` - wait for the user to stop typing (1/2 second in this case).
-1. `distinctUntilChanged()` - wait until the search text changes.
-1. `switchMap()` - send the search request to the service.
-
-The code sets `packages$` to this re-composed `Observable` of search results.
-The template subscribes to `packages$` with the [AsyncPipe](api/common/AsyncPipe)
-and displays search results as they arrive.
-
-A search value reaches the service only if it's a new value and the user has stopped typing.
-
-<div class="alert is-helpful">
-
-The `withRefresh` option is explained [below](#cache-refresh).
-
-</div>
-
-#### _switchMap()_
-
-The `switchMap()` operator has three important characteristics.
-
-1. It takes a function argument that returns an `Observable`.
-`PackageSearchService.search` returns an `Observable`, as other data service methods do.
-
-2. If a previous search request is still _in-flight_ (as when the connection is poor),
-it cancels that request and sends a new one.
-
-3. It returns service responses in their original request order, even if the
-server returns them out of order.
-
-
-<div class="alert is-helpful">
-
-If you think you'll reuse this debouncing logic,
-consider moving it to a utility function or into the `PackageSearchService` itself.
-
-</div>
-
-### Intercepting requests and responses
+{@a intercepting-requests-and-responses }
+### HTTP interceptors
 
 _HTTP Interception_ is a major feature of `@angular/common/http`.
 With interception, you declare _interceptors_ that inspect and transform HTTP requests from your application to the server.
@@ -642,7 +585,7 @@ You may have expected the `intercept()` and `handle()` methods to return observa
 
 Instead they return observables of `HttpEvent<any>`.
 
-That's because interceptors work at a lower level than those `HttpClient` methods. A single HTTP request can generate multiple _events_, including upload and download progress events. The `HttpResponse` class itself is actually an event, whose type is `HttpEventType.HttpResponseEvent`.
+That's because interceptors work at a lower level than those `HttpClient` methods. A single HTTP request can generate multiple _events_, including upload and download progress events. The `HttpResponse` class itself is actually an event, whose type is `HttpEventType.Response`.
 
 Many interceptors are only concerned with the outgoing request and simply return the event stream from `next.handle()` without modifying it.
 
@@ -845,6 +788,117 @@ the cached response first (and immediately), followed later
 by the response from the server.
 Subscribers see a sequence of _two_ responses.
 
+### Configuring the request
+
+Other aspects of an outgoing request can be configured via the options object
+passed as the last argument to the `HttpClient` method.
+
+In [Adding headers](#adding-headers), the `HeroesService` set the default headers by
+passing an options object (`httpOptions`) to its save methods.
+You can do more.
+
+#### URL query strings
+
+In this section, you will see how to use the `HttpParams` class to add URL query strings in your `HttpRequest`.
+
+The following `searchHeroes` method queries for heroes whose names contain the search term.
+Start by importing `HttpParams` class.
+
+<code-example hideCopy language="typescript">
+import {HttpParams} from "@angular/common/http";
+</code-example>
+
+<code-example
+  path="http/src/app/heroes/heroes.service.ts"
+  region="searchHeroes" linenums="false">
+</code-example>
+
+If there is a search term, the code constructs an options object with an HTML URL-encoded search parameter.
+If the term were "foo", the GET request URL would be `api/heroes?name=foo`.
+
+The `HttpParams` are immutable so you'll have to save the returned value of the `.set()` method in order  to update the options.
+
+#### Use `fromString` to create HttpParams
+
+You can also create HTTP parameters directly from a query string by using the `fromString` variable:
+
+<code-example hideCopy language="typescript">
+const params = new HttpParams({fromString: 'name=foo'});
+</code-example>
+
+### Debouncing requests
+
+The sample includes an _npm package search_ feature.
+
+When the user enters a name in a search-box, the `PackageSearchComponent` sends
+a search request for a package with that name to the NPM web API.
+
+Here's a pertinent excerpt from the template:
+
+<code-example
+  path="http/src/app/package-search/package-search.component.html"
+  region="search"
+  header="app/package-search/package-search.component.html (search)">
+</code-example>
+
+The `keyup` event binding sends every keystroke to the component's `search()` method.
+
+Sending a request for every keystroke could be expensive.
+It's better to wait until the user stops typing and then send a request.
+That's easy to implement with RxJS operators, as shown in this excerpt.
+
+<code-example
+  path="http/src/app/package-search/package-search.component.ts"
+  region="debounce"
+  header="app/package-search/package-search.component.ts (excerpt)">
+</code-example>
+
+The `searchText$` is the sequence of search-box values coming from the user.
+It's defined as an RxJS `Subject`, which means it is a multicasting `Observable`
+that can also emit values for itself by calling `next(value)`,
+as happens in the `search()` method.
+
+Rather than forward every `searchText` value directly to the injected `PackageSearchService`,
+the code in `ngOnInit()` _pipes_ search values through three operators:
+
+1. `debounceTime(500)` - wait for the user to stop typing (1/2 second in this case).
+
+2. `distinctUntilChanged()` - wait until the search text changes.
+
+3. `switchMap()` - send the search request to the service.
+
+The code sets `packages$` to this re-composed `Observable` of search results.
+The template subscribes to `packages$` with the [AsyncPipe](api/common/AsyncPipe)
+and displays search results as they arrive.
+
+A search value reaches the service only if it's a new value and the user has stopped typing.
+
+<div class="alert is-helpful">
+
+The `withRefresh` option is explained [below](#cache-refresh).
+
+</div>
+
+#### _switchMap()_
+
+The `switchMap()` operator has three important characteristics.
+
+1. It takes a function argument that returns an `Observable`.
+`PackageSearchService.search` returns an `Observable`, as other data service methods do.
+
+2. If a previous search request is still _in-flight_ (as when the network connection is poor),
+it cancels that request and sends a new one.
+
+3. It returns service responses in their original request order, even if the
+server returns them out of order.
+
+<div class="alert is-helpful">
+
+If you think you'll reuse this debouncing logic,
+consider moving it to a utility function or into the `PackageSearchService` itself.
+
+</div>
+
 ### Listening to progress events
 
 Sometimes applications transfer large amounts of data and those transfers can take a long time.
@@ -895,22 +949,26 @@ by returning an observable of simulated events.
 
 </div>
 
-## Security: XSRF Protection
+## Security: XSRF protection
 
-[Cross-Site Request Forgery (XSRF)](https://en.wikipedia.org/wiki/Cross-site_request_forgery) is an attack technique by which the attacker can trick an authenticated user into unknowingly executing actions on your website. `HttpClient` supports a [common mechanism](https://en.wikipedia.org/wiki/Cross-site_request_forgery#Cookie-to-Header_Token) used to prevent XSRF attacks. When performing HTTP requests, an interceptor reads a token from a cookie, by default `XSRF-TOKEN`, and sets it as an HTTP header, `X-XSRF-TOKEN`. Since only code that runs on your domain could read the cookie, the backend can be certain that the HTTP request came from your client application and not an attacker.
+[Cross-Site Request Forgery (XSRF)](https://en.wikipedia.org/wiki/Cross-site_request_forgery) is an attack technique by which the attacker can trick an authenticated user into unknowingly executing actions on your website.
+`HttpClient` supports a [common mechanism](https://en.wikipedia.org/wiki/Cross-site_request_forgery#Cookie-to-Header_Token) used to prevent XSRF attacks.
+When performing HTTP requests, an interceptor reads a token from a cookie, by default `XSRF-TOKEN`, and sets it as an HTTP header, `X-XSRF-TOKEN`.
+Since only code that runs on your domain could read the cookie, the backend can be certain that the HTTP request came from your client application and not an attacker.
 
-By default, an interceptor sends this header on all mutating requests (POST, etc.)
-to relative URLs but not on GET/HEAD requests or
-on requests with an absolute URL.
+By default, an interceptor sends this header on all mutating requests (such as POST)
+to relative URLs, but not on GET/HEAD requests or on requests with an absolute URL.
 
-To take advantage of this, your server needs to set a token in a JavaScript readable session cookie called `XSRF-TOKEN` on either the page load or the first GET request. On subsequent requests the server can verify that the cookie matches the `X-XSRF-TOKEN` HTTP header, and therefore be sure that only code running on your domain could have sent the request. The token must be unique for each user and must be verifiable by the server; this prevents the client from making up its own tokens. Set the token to a digest of your site's authentication
-cookie with a salt for added security.
+To take advantage of this, your server needs to set a token in a JavaScript readable session cookie called `XSRF-TOKEN` on either the page load or the first GET request.
+On subsequent requests the server can verify that the cookie matches the `X-XSRF-TOKEN` HTTP header, and therefore be sure that only code running on your domain could have sent the request.
+The token must be unique for each user and must be verifiable by the server; this prevents the client from making up its own tokens.
+Set the token to a digest of your site's authentication cookie with a salt for added security.
 
 In order to prevent collisions in environments where multiple Angular apps share the same domain or subdomain, give each application a unique cookie name.
 
 <div class="alert is-important">
 
-*Note that `HttpClient` supports only the client half of the XSRF protection scheme.*
+*`HttpClient` supports only the client half of the XSRF protection scheme.*
 Your backend service must be configured to set the cookie for your page, and to verify that
 the header is present on all eligible requests.
 If not, Angular's default protection will be ineffective.
@@ -929,19 +987,13 @@ use `HttpClientXsrfModule.withOptions()` to override the defaults.
 
 ## Testing HTTP requests
 
-Like any external dependency, the HTTP backend needs to be mocked
-so your tests can simulate interaction with a remote server.
-The `@angular/common/http/testing` library makes
-setting up such mocking straightforward.
+As for any external dependency, you must mock the HTTP backend so your tests can simulate interaction with a remote server.
+The `@angular/common/http/testing` library makes it straightforward to set up such mocking .
 
-### Mocking philosophy
-
-Angular's HTTP testing library is designed for a pattern of testing wherein
-the app executes code and makes requests first.
-
-Then a test expects that certain requests have or have not been made,
+Angular's HTTP testing library is designed for a pattern of testing in which the app executes code and makes requests first.
+The test then expects that certain requests have or have not been made,
 performs assertions against those requests,
-and finally provide responses by "flushing" each expected request.
+and finally provides responses by "flushing" each expected request.
 
 At the end, tests may verify that the app has made no unexpected requests.
 

aio/content/guide/i18n.md

@@ -707,22 +707,24 @@ the CLI configuration file, `angular.json`.
         "i18nLocale": "fr",
         "i18nMissingTranslation": "error",
       }
-// ...
-"serve": {
-  "builder": "@angular-devkit/build-angular:dev-server",
-  "options": {
-    "browserTarget": "my-project:build"
+    }
   },
-  "configurations": {
-    "production": {
-      "browserTarget": "my-project:build:production"
+  ...
+  "serve": {
+    "builder": "@angular-devkit/build-angular:dev-server",
+    "options": {
+      "browserTarget": "my-project:build"
     },
-    "fr": {
-      "browserTarget": "my-project:build:fr"
+    "configurations": {
+      "production": {
+        "browserTarget": "my-project:build:production"
+      },
+      "fr": {
+        "browserTarget": "my-project:build:fr"
+      }
     }
   }
-},
-
+}
 ```
 
 The same configuration options can also be provided through the CLI with your existing `production` configuration.

aio/content/guide/ivy.md

@@ -1,38 +1,24 @@
-# Opting into Angular Ivy
+# Opting out of Angular Ivy
 
-Ivy is the code name for Angular's [next-generation compilation and rendering pipeline](https://blog.angular.io/a-plan-for-version-8-0-and-ivy-b3318dfc19f7). Starting with Angular version 8, you can choose to opt in to start using a preview version of Ivy and help in its continuing development and tuning.
+Ivy is the code name for Angular's [next-generation compilation and rendering pipeline](https://blog.angular.io/a-plan-for-version-8-0-and-ivy-b3318dfc19f7). 
+Starting with Angular version 9, Ivy compilation and rendering pipeline is enabled by default.
+The previous compilation and rendering pipeline, View Engine, is deprecated in version 9, and will be removed at a later date.
+You can choose to opt out of Ivy and continue using View Engine while making the transition.
 
-<div class="alert is-helpful">
-
-   To preview Ivy, use `@angular/core@next` version of Angular (8.1.x), rather than `@angular/core@latest` (8.0.x), as it contains all the latest bug fixes and improvements.
-
-</div>
-
-
-## Using Ivy in a new project
-
-To start a new project with Ivy enabled, use the `--enable-ivy` flag with the [`ng new`](cli/new) command:
-
-```sh
-ng new shiny-ivy-app --enable-ivy
-```
-
-The new project is automatically configured for Ivy. Specifically, the enableIvy option is set to `true` in the project's `tsconfig.app.json` file.
-
-
-## Using Ivy in an existing project
-
-To update an existing project to use Ivy, set the `enableIvy` option in the `angularCompilerOptions` in your project's `tsconfig.app.json`.
+To opt out of Ivy and continue using View Engine for an existing project, set the `enableIvy` option in the `angularCompilerOptions` in your project's `tsconfig.json` to `false`.
 ```json
 {
   "compilerOptions": { ... },
   "angularCompilerOptions": {
-    "enableIvy": true
+    "enableIvy": false
   }
 }
 ```
 
-AOT compilation with Ivy is faster and should be used by default. In the `angular.json` workspace configuration file, set the default build options for your project to always use AOT compilation.
+AOT compilation with Ivy is faster than with View Engine, and can be used for development. 
+If you opt out of Ivy, AOT compilation will be slower, and should not be used for development in large projects. 
+When Ivy is disabled for a large project, make sure that the `aot` build option in that project configuration is 
+set to `false` and it's only set to `true` in the `production` configuration.
 
 ```json
 {
@@ -42,7 +28,13 @@ AOT compilation with Ivy is faster and should be used by default. In the `angula
         "build": {
           "options": {
             ...
-            "aot": true,
+            "aot": false,
+          },
+          "configurations": {
+            "production": {
+              ...
+              "aot": true
+            }
           }
         }
       }
@@ -50,6 +42,3 @@ AOT compilation with Ivy is faster and should be used by default. In the `angula
   }
 }
 ```
-
-To stop using the Ivy compiler, set `enableIvy` to `false` in `tsconfig.app.json`, or remove it completely. Also remove `"aot": true` from your default build options if you didn't have it there before.
- 

aio/content/guide/router.md

@@ -519,7 +519,8 @@ During each navigation, the `Router` emits navigation events through the `Router
     <td>
 
       An [event](api/router/NavigationCancel) triggered when navigation is canceled.
-      This is due to a [Route Guard](#guards) returning false during navigation.
+      This can happen when a [Route Guard](#guards) returns false during navigation,
+      or redirects by returning a `UrlTree`.
 
     </td>
   </tr>

aio/content/guide/service-worker-config.md

@@ -137,8 +137,9 @@ export interface DataGroup {
 Similar to `assetGroups`, every data group has a `name` which uniquely identifies it.
 
 ### `urls`
-A list of URL patterns. URLs that match these patterns will be cached according to this data group's policy.<br>
-  _(Negative glob patterns are not supported and `?` will be matched literally; i.e. it will not match any character other than `?`.)_
+A list of URL patterns. URLs that match these patterns are cached according to this data group's policy. Only non-mutating requests (GET and HEAD) are cached.
+ * Negative glob patterns are not supported.
+ * `?` is matched literally; that is, it matches *only* the character `?`.
 
 ### `version`
 Occasionally APIs change formats in a way that is not backward-compatible. A new version of the app may not be compatible with the old API format and thus may not be compatible with existing cached resources from that API.

aio/content/guide/service-worker-intro.md

@@ -31,22 +31,54 @@ Installing the Angular service worker is as simple as including an `NgModule`. I
 
 ## Prerequisites
 
-Your application must run in a web browser that supports service workers. Currently, service workers are supported in the latest versions of Chrome, Firefox, Edge, Safari, Opera, UC Browser (Android version) and Samsung Internet. Browsers like IE and Opera Mini do not provide the support. To learn more about other browsers that are service worker ready, see the [Can I Use](https://caniuse.com/#feat=serviceworkers) page and [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API).
+To make use of all the features of Angular service worker, use the latest versions of Angular and the Angular CLI.
 
-In addition, in order for service workers to be registered, the app must be accessed over HTTPS, not HTTP. Browsers will ignore service workers on pages that are served over an insecure connection. The reason is that service workers are quite powerful, so extra care needs to be taken to ensure the service worker script has not been tampered with.
+In order for service workers to be registered, the app must be accessed over HTTPS, not HTTP.
+Browsers ignore service workers on pages that are served over an insecure connection.
+The reason is that service workers are quite powerful, so extra care needs to be taken to ensure the service worker script has not been tampered with.
+
+There is one exception to this rule: to make local development easier, browsers do _not_ require a secure connection when accessing an app on `localhost`.
+
+### Browser support
+
+To benefit from the Angular service worker, your app must run in a web browser that supports service workers in general.
+Currently, service workers are supported in the latest versions of Chrome, Firefox, Edge, Safari, Opera, UC Browser (Android version) and Samsung Internet.
+Browsers like IE and Opera Mini do not support service workers.
+
+If the user is accessing your app via a browser that does not support service workers, the service worker is not registered and related behavior such as offline cache management and push notifications does not happen.
+More specifically:
+
+* The browser does not download the service worker script and `ngsw.json` manifest file.
+* Active attempts to interact with the service worker, such as calling `SwUpdate.checkForUpdate()`, return rejected promises.
+* The observable events of related services, such as `SwUpdate.available`, are not triggered.
+
+It is highly recommended that you ensure that your app works even without service worker support in the browser.
+Although an unsupported browser ignores service worker caching, it will still report errors if the app attempts to interact with the service worker.
+For example, calling `SwUpdate.checkForUpdate()` will return rejected promises.
+To avoid such an error, you can check whether the Angular service worker is enabled using `SwUpdate.isEnabled()`.
+
+To learn more about other browsers that are service worker ready, see the [Can I Use](https://caniuse.com/#feat=serviceworkers) page and [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API).
 
-There is one exception to this rule: To make local development easier, browsers do _not_ require a secure connection when accessing an app on `localhost`.
 
 ## Related resources
 
+The rest of the articles in this section specifically address the Angular implementation of service workers.
+
+* [App Shell](guide/app-shell)
+* [Service Worker Communication](guide/service-worker-communications)
+* [Service Worker in Production](guide/service-worker-devops)
+* [Service Worker Configuration](guide/service-worker-config)
+
 For more information about service workers in general, see [Service Workers: an Introduction](https://developers.google.com/web/fundamentals/primers/service-workers/).
 
 For more information about browser support, see the [browser support](https://developers.google.com/web/fundamentals/primers/service-workers/#browser_support) section of [Service Workers: an Introduction](https://developers.google.com/web/fundamentals/primers/service-workers/), Jake Archibald's [Is Serviceworker ready?](https://jakearchibald.github.io/isserviceworkerready/), and
 [Can I Use](http://caniuse.com/#feat=serviceworkers).
 
-The remainder of this Angular documentation specifically addresses the Angular implementation of service workers.
+For additional recommendations and examples, see:
 
-## More on Angular service workers
+* [Precaching with Angular Service Worker](https://web.dev/precaching-with-the-angular-service-worker/)
+* [Creating a PWA with Angular CLI](https://web.dev/creating-pwa-with-angular-cli/)
 
-You may also be interested in the following:
-* [Getting Started with service workers](guide/service-worker-getting-started).
+## Next steps
+
+To begin using Angular service workers, see [Getting Started with service workers](guide/service-worker-getting-started).

aio/content/guide/singleton-services.md

@@ -1,6 +1,6 @@
 # Singleton services
 
-A singleton service is a service for which only once instance exists in an app.
+A singleton service is a service for which only one instance exists in an app.
 
 For a sample app using the app-wide singleton service that this page describes, see the
 <live-example name="ngmodules"></live-example> showcasing all the documented features of NgModules.

aio/content/guide/template-syntax.md

@@ -6,8 +6,7 @@
   h4 .syntax { font-size: 100%; }
 </style>
 
-The Angular application manages what the user sees and can do, achieving this through the interaction of a
-component class instance (the *component*) and its user-facing template.
+The Angular application manages what the user sees and can do, achieving this through the interaction of a component class instance (the *component*) and its user-facing template.
 
 You may be familiar with the component/template duality from your experience with model-view-controller (MVC) or model-view-viewmodel (MVVM).
 In Angular, the component plays the part of the controller/viewmodel, and the template represents the view.
@@ -85,12 +84,10 @@ converts the expression results to strings, and links them with neighboring lite
 it assigns this composite interpolated result to an **element or directive property**.
 
 You appear to be inserting the result between element tags and assigning it to attributes.
+However, interpolation is a special syntax that Angular converts into a *property binding*.
 
 <div class="alert is-helpful">
 
-However, interpolation is a special syntax that Angular converts into a
-property binding.
-
 If you'd like to use something other than `{{` and `}}`, you can
 configure the interpolation delimiter via the
 [interpolation](api/core/Component#interpolation)
@@ -124,8 +121,8 @@ including:
 Other notable differences from JavaScript syntax include:
 
 * No support for the bitwise operators such as `|` and `&`
-* New template expression operators, such as `|`, `?.` and `!`
-<!-- link to: guide/template-syntax#expression-operators -->
+* New [template expression operators](guide/template-syntax#expression-operators), such as `|`, `?.` and `!`
+
 
 ### Expression context
 
@@ -171,12 +168,29 @@ members of the expression context.
 
 When using template expressions follow these guidelines:
 
-* [No visible side effects](guide/template-syntax#no-visible-side-effects)
-* [Quick execution](guide/template-syntax#quick-execution)
 * [Simplicity](guide/template-syntax#simplicity)
+* [Quick execution](guide/template-syntax#quick-execution)
+* [No visible side effects](guide/template-syntax#no-visible-side-effects)
 
+#### Simplicity
 
-### No visible side effects
+Although it's possible to write complex template expressions, it's a better
+practice to avoid them.
+
+A property name or method call should be the norm, but an occasional Boolean negation, `!`, is OK.
+Otherwise, confine application and business logic to the component,
+where it is easier to develop and test.
+
+#### Quick execution
+
+Angular executes template expressions after every change detection cycle.
+Change detection cycles are triggered by many asynchronous activities such as
+promise resolutions, HTTP results, timer events, key presses and mouse moves.
+
+Expressions should finish quickly or the user experience may drag, especially on slower devices.
+Consider caching values when their computation is expensive.
+
+#### No visible side effects
 
 A template expression should not change any application state other than the value of the
 target property.
@@ -187,40 +201,18 @@ The view should be stable throughout a single rendering pass.
 
 An [idempotent](https://en.wikipedia.org/wiki/Idempotence) expression is ideal because
 it is free of side effects and improves Angular's change detection performance.
-
 In Angular terms, an idempotent expression always returns
-*exactly the same thing* until
-one of its dependent values changes.
+*exactly the same thing* until one of its dependent values changes.
 
 Dependent values should not change during a single turn of the event loop.
 If an idempotent expression returns a string or a number, it returns the same string or number when called twice in a row. If the expression returns an object, including an `array`, it returns the same object *reference* when called twice in a row.
 
 <div class="alert is-helpful">
 
-There is one exception to this behavior that applies to `*ngFor`. `*ngFor` has `trackBy` functionality that can deal with referential inequality of objects that when iterating over them.
-
-For more information, see the [*ngFor with `trackBy`](guide/template-syntax#ngfor-with-trackby) section of this guide.
+There is one exception to this behavior that applies to `*ngFor`. `*ngFor` has `trackBy` functionality that can deal with referential inequality of objects when iterating over them. See [*ngFor with `trackBy`](guide/template-syntax#ngfor-with-trackby) for details.
 
 </div>
 
-### Quick execution
-
-Angular executes template expressions after every change detection cycle.
-Change detection cycles are triggered by many asynchronous activities such as
-promise resolutions, HTTP results, timer events, key presses and mouse moves.
-
-Expressions should finish quickly or the user experience may drag, especially on slower devices.
-Consider caching values when their computation is expensive.
-
-### Simplicity
-
-Although it's possible to write complex template expressions, it's a better
-practice to avoid them.
-
-A property name or method call should be the norm, but an occasional Boolean negation, `!`, is OK.
-Otherwise, confine application and business logic to the component,
-where it is easier to develop and test.
-
 <!-- end of Interpolation doc -->
 
 <hr/>
@@ -278,19 +270,15 @@ Template context names take precedence over component context names.
 In `deleteHero(hero)` above, the `hero` is the template input variable,
 not the component's `hero` property.
 
+### Statement guidelines
+
 Template statements cannot refer to anything in the global namespace. They
 can't refer to `window` or `document`.
 They can't call `console.log` or `Math.max`.
 
-### Statement guidelines
-
 As with expressions, avoid writing complex template statements.
 A method call or simple property assignment should be the norm.
 
-Now that you have a feel for template expressions and statements,
-you're ready to learn about the varieties of data binding syntax beyond interpolation.
-
-
 <hr/>
 
 {@a binding-syntax}
@@ -396,7 +384,7 @@ Every public member of a **source** directive is automatically available for bin
 You don't have to do anything special to access a directive member in a template expression or statement.
 
 
-## Data-binding and HTML
+### Data-binding and HTML
 
 In the normal course of HTML development, you create a visual structure with HTML elements, and
 you modify those elements by setting element attributes with string constants.
@@ -415,10 +403,10 @@ Notice that the binding is to the `disabled` property of the button's DOM elemen
 **not** the attribute. This applies to data-binding in general. Data-binding works with *properties* of DOM elements, components, and directives, not HTML *attributes*.
 
 
-## HTML attribute vs. DOM property
+### HTML attribute vs. DOM property
 
 The distinction between an HTML attribute and a DOM property is key to understanding
-how Angular binding works. **Attributes are defined by HTML. Properties are accessed from DOM, or the Document Object Model, nodes.**
+how Angular binding works. **Attributes are defined by HTML. Properties are accessed from DOM (Document Object Model) nodes.**
 
 * A few HTML attributes have 1:1 mapping to properties; for example, `id`.
 
@@ -426,31 +414,30 @@ how Angular binding works. **Attributes are defined by HTML. Properties are acce
 
 * Some DOM properties don't have corresponding attributes; for example, `textContent`.
 
-This general rule can help you build a mental model of attributes and DOM properties:
-**attributes initialize DOM properties and then they are done.
-Property values can change; attribute values can't.**
+It is important to remember that *HTML attribute* and the *DOM property* are different things, even when they have the same name.
+In Angular, the only role of HTML attributes is to initialize element and directive state.
+
+**Template binding works with *properties* and *events*, not *attributes*.**
+
+When you write a data-binding, you're dealing exclusively with the *DOM properties* and *events* of the target object.
 
 <div class="alert is-helpful">
 
-There is, of course, an exception to this rule because attributes can be changed by `setAttribute()`, which will re-initialize corresponding DOM properties again.
+This general rule can help you build a mental model of attributes and DOM properties:
+**Attributes initialize DOM properties and then they are done.
+Property values can change; attribute values can't.**
+
+There is one exception to this rule.
+Attributes can be changed by `setAttribute()`, which re-initializes corresponding DOM properties.
 
 </div>
 
-Comparing the [`<td>` attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td)
- attributes to the [`<td>` properties](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableCellElement)
- provides a helpful
-example for differentiation. In particular, you can navigate from the attributes
-page to the properties via "DOM interface" link, and navigate the inheritance
-hierarchy up to `HTMLTableCellElement`.
-
-**The HTML attribute and the DOM property are not the same thing, even when they have the same name.**
-
 For more information, see the [MDN Interfaces documentation](https://developer.mozilla.org/en-US/docs/Web/API#Interfaces) which has API docs for all the standard DOM elements and their properties.
+Comparing the [`<td>` attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td) attributes to the [`<td>` properties](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableCellElement) provides a helpful example for differentiation.
+In particular, you can navigate from the attributes page to the properties via "DOM interface" link, and navigate the inheritance hierarchy up to `HTMLTableCellElement`.
 
 
-
-
-### Example 1: an `<input>`
+#### Example 1: an `<input>`
 
 When the browser renders `<input type="text" value="Sarah">`, it creates a
 corresponding DOM node with a `value` property initialized to "Sarah".
@@ -466,7 +453,7 @@ The HTML attribute `value` specifies the *initial* value; the DOM `value` proper
 
 To see attributes versus DOM properties in a functioning app, see the <live-example name="binding-syntax"></live-example> especially for binding syntax.
 
-### Example 2: a disabled button
+#### Example 2: a disabled button
 
 The `disabled` attribute is another example. A button's `disabled`
 *property* is `false` by default so the button is enabled.
@@ -479,8 +466,7 @@ so the button is disabled.
 <button disabled>Test Button</button>
 ```
 
-Adding and removing the `disabled` *attribute* disables and
-enables the button.
+Adding and removing the `disabled` *attribute* disables and enables the button.
 However, the value of the *attribute* is irrelevant,
 which is why you cannot enable a button by writing `<button disabled="false">Still Disabled</button>`.
 
@@ -488,7 +474,7 @@ To control the state of the button, set the `disabled` *property*,
 
 <div class="alert is-helpful">
 
-**Note:** Though you could technically set the `[attr.disabled]` attribute binding, the values are different in that the property binding requires to a boolean value, while its corresponding attribute binding relies on whether the value is `null` or not. Consider the following:
+Though you could technically set the `[attr.disabled]` attribute binding, the values are different in that the property binding requires to a boolean value, while its corresponding attribute binding relies on whether the value is `null` or not. Consider the following:
 
 ```html
 <input [disabled]="condition ? true : false">
@@ -499,26 +485,15 @@ Generally, use property binding over attribute binding as it is more intuitive (
 
 </div>
 
-**The HTML attribute and the DOM property are different things, even when they have the same name.**
-
-**Template binding works with *properties* and *events*, not *attributes*.**
 
 To see the `disabled` button example in a functioning app, see the <live-example name="binding-syntax"></live-example> especially for binding syntax. This example shows you how to toggle the disabled property from the component.
 
-
-### Angular and attributes
-
-In Angular, the only role of attributes is to initialize element and directive state.
-When you write a data-binding, you're dealing exclusively with properties and events of the target object.
-
-
-## Binding targets
+## Binding types and targets
 
 The **target of a data-binding** is something in the DOM.
-Depending on the binding type, the target can be a
-property (element, component, or directive), an
-event (element, component, or directive), or sometimes an attribute name.
-The following table summarizes:
+Depending on the binding type, the target can be a property (element, component, or directive),
+an event (element, component, or directive), or sometimes an attribute name.
+The following table summarizes the targets for the different binding types.
 
 <style>
   td, th {vertical-align: top}
@@ -678,10 +653,9 @@ for parent and child components to communicate:
 
 <code-example path="property-binding/src/app/app.component.html" region="model-property-binding" header="src/app/app.component.html"></code-example>
 
-### Binding target
+### Binding targets
 
-An element property between enclosing square brackets identifies
-the target property.
+An element property between enclosing square brackets identifies the target property.
 The target property in the following code is the image element's `src` property.
 
 <code-example path="property-binding/src/app/app.component.html" region="property-binding" header="src/app/app.component.html"></code-example>
@@ -847,10 +821,10 @@ property binding but both approaches render the
 content harmlessly. The following is the browser output
 of the `evilTitle` examples.
 
-```
+<code-example language="bash">
 "Template <script>alert("evil never sleeps")</script> Syntax" is the interpolated evil title.
 "Template alert("evil never sleeps")Syntax" is the property bound evil title.
-```
+</code-example>
 
 <hr/>
 {@a other-bindings}
@@ -898,7 +872,7 @@ If you wrote something like this:
 
 You'd get this error:
 
-<code-example format="nocode">
+<code-example language="bash">
   Template parse errors:
   Can't bind to 'colspan' since it isn't a known native property
 </code-example>
@@ -968,8 +942,8 @@ The following example conditionally sets the font size in  “em” and “%”
 
 <code-example path="attribute-binding/src/app/app.component.html" region="style-binding-condition" header="src/app/app.component.html"></code-example>
 
-**This technique is suitable for setting a single style, but consider
-the [`NgStyle`](guide/template-syntax#ngStyle) directive when setting several inline styles at the same time.**
+This technique is suitable for setting a single style, but consider
+the [`NgStyle`](guide/template-syntax#ngStyle) directive when setting several inline styles at the same time.
 
 <div class="alert is-helpful">
 
@@ -1156,7 +1130,7 @@ Angular desugars the `SizerComponent` binding into this:
 The `$event` variable contains the payload of the `SizerComponent.sizeChange` event.
 Angular assigns the `$event` value to the `AppComponent.fontSizePx` when the user clicks the buttons.
 
-## Two-way binding in forms
+### Two-way binding in forms
 
 The two-way binding syntax is a great convenience compared to
 separate property and event bindings. It would be convenient to
@@ -1417,7 +1391,7 @@ efficient alternative to showing/hiding.
 
 <div class="alert is-helpful">
 
-**Note:** For more information on `NgIf` and `ngIfElse`, see the [API documentation about NgIf](api/common/NgIf).
+For more information on `NgIf` and `ngIfElse`, see the [API documentation about NgIf](api/common/NgIf).
 
 </div>
 
@@ -1448,26 +1422,20 @@ See also the
 `NgFor` is a repeater directive&mdash;a way to present a list of items.
 You define a block of HTML that defines how a single item should be displayed
 and then you tell Angular to use that block as a template for rendering each item in the list.
+The text assigned to `*ngFor` is the instruction that guides the repeater process.
 
-Here is an example of `NgFor` applied to a simple `<div>`:
+The following example shows `NgFor` applied to a simple `<div>`. (Don't forget the asterisk (`*`) in front of `ngFor`.)
 
 <code-example path="built-in-directives/src/app/app.component.html" region="NgFor-1" header="src/app/app.component.html"></code-example>
 
-You can also apply an `NgFor` to a component element, as in this example:
+You can also apply an `NgFor` to a component element, as in the following example.
 
 <code-example path="built-in-directives/src/app/app.component.html" region="NgFor-2" header="src/app/app.component.html"></code-example>
 
-<div class="alert is-critical">
-
-Don't forget the asterisk (`*`) in front of `ngFor`.
-
-</div>
-
-The text assigned to `*ngFor` is the instruction that guides the repeater process.
-
 {@a microsyntax}
 
-#### `*ngFor` microsyntax
+<div class="callout is-critical">
+<header>*ngFor microsyntax</header>
 
 The string assigned to `*ngFor` is not a [template expression](guide/template-syntax#template-expressions). Rather,
 it's a *microsyntax*&mdash;a little language of its own that Angular interprets.
@@ -1479,15 +1447,15 @@ make it available to the templated HTML for each iteration.*
 Angular translates this instruction into an `<ng-template>` around the host element,
 then uses this template repeatedly to create a new set of elements and bindings for each `item`
 in the list.
-
 For more information about microsyntax, see the [Structural Directives](guide/structural-directives#microsyntax) guide.
 
+</div>
+
 
 {@a template-input-variable}
 
 {@a template-input-variables}
 
-
 #### Template input variables
 
 The `let` keyword before `item` creates a template input variable called `item`.
@@ -1930,7 +1898,7 @@ in the child template UI.
 
 Now, in order to see the `@Output()` working, add the following to the parent's template:
 
-```
+```html
   <ul>
     <li *ngFor="let item of items">{{item}}</li>
   </ul>
@@ -1989,7 +1957,7 @@ properties do indeed exist, double check
 that your properties are annotated with `@Input()` / `@Output()` or that you've declared
 them in an `inputs`/`outputs` array:
 
-<code-example language="sh" class="code-shell">
+<code-example language="bash">
 Uncaught Error: Template parse errors:
 Can't bind to 'item' since it isn't a known property of 'app-item-detail'
 </code-example>
@@ -2067,7 +2035,7 @@ The generated output would look something like this:
 
 <div class="alert is-helpful">
 
-**Note**: The pipe operator has a higher precedence than the ternary operator (`?:`),
+The pipe operator has a higher precedence than the ternary operator (`?:`),
 which means `a ? b : c | x` is parsed as `a ? b : (c | x)`.
 Nevertheless, for a number of reasons,
 the pipe operator cannot be used without parentheses in the first and second operands of `?:`.
@@ -2097,7 +2065,7 @@ Consider the next example, with a `nullItem`.
 
 Since there is no safe navigation operator and `nullItem` is `null`, JavaScript and Angular would throw a `null` reference error and break the rendering process of Angular:
 
-<code-example format="nocode">
+<code-example language="bash">
   TypeError: Cannot read property 'name' of null.
 </code-example>
 
@@ -2151,9 +2119,9 @@ The non-null assertion operator, `!`, is optional with the exception that you mu
 
 ### The `$any()` type cast function
 
-Sometimes a binding expression triggers a type error during [AOT compilation](guide/aot-compiler) and it is not possible or difficult
-to fully specify the type. To silence the error, you can use the `$any()` cast function to cast
-the expression to [the `any` type](http://www.typescriptlang.org/docs/handbook/basic-types.html#any) as in the following example:
+Sometimes a binding expression triggers a type error during [AOT compilation](guide/aot-compiler) and it is not possible or difficult to fully specify the type.
+To silence the error, you can use the `$any()` cast function to cast
+the expression to the [`any` type](http://www.typescriptlang.org/docs/handbook/basic-types.html#any) as in the following example:
 
 <code-example path="built-in-template-functions/src/app/app.component.html" region="any-type-cast-function-1" header="src/app/app.component.html"></code-example>
 
@@ -2183,7 +2151,7 @@ Refer to the sample code snippet below for a syntax example:
 
 <code-example path="template-syntax/src/app/svg.component.ts" header="src/app/svg.component.ts"></code-example>
 
-Add the below code to your `svg.component.svg` file:
+Add the following code to your `svg.component.svg` file:
 
 <code-example path="template-syntax/src/app/svg.component.svg" header="src/app/svg.component.svg"></code-example>
 

aio/content/guide/testing.md

@@ -1212,7 +1212,8 @@ value becomes available. The test must become _asynchronous_.
 
 #### Async test with _fakeAsync()_
 
-To use `fakeAsync()` functionality, you need to import `zone-testing`, for details, please read [setup guide](guide/setup#appendix-test-using-fakeasyncasync).
+To use `fakeAsync()` functionality, you must import `zone.js/dist/zone-testing` in your test setup file.
+If you created your project with the Angular CLI, `zone-testing` is already imported in `src/test.ts`.
 
 The following test confirms the expected behavior when the service returns an `ErrorObservable`.
 
@@ -1231,6 +1232,13 @@ The `fakeAsync()` function enables a linear coding style by running the test bod
 The test body appears to be synchronous.
 There is no nested syntax (like a `Promise.then()`) to disrupt the flow of control.
 
+<div class="alert is-helpful">
+
+Limitation: The `fakeAsync()` function won't work if the test body makes an `XMLHttpRequest` (XHR) call.
+XHR calls within a test are rare, but if you need to call XHR, see [`async()`](#async), below.
+
+</div>
+
 {@a tick}
 
 #### The _tick()_ function
@@ -1406,13 +1414,13 @@ Then you can assert that the quote element displays the expected text.
 
 #### Async test with _async()_
 
-To use `async()` functionality, you need to import `zone-testing`, for details, please read [setup guide](guide/setup#appendix-test-using-fakeasyncasync).
+To use `async()` functionality, you must import `zone.js/dist/zone-testing` in your test setup file.
+If you created your project with the Angular CLI, `zone-testing` is already imported in `src/test.ts`.
 
 The `fakeAsync()` utility function has a few limitations.
-In particular, it won't work if the test body makes an `XHR` call.
-
-`XHR` calls within a test are rare so you can generally stick with `fakeAsync()`.
-But if you ever do need to call `XHR`, you'll want to know about `async()`.
+In particular, it won't work if the test body makes an `XMLHttpRequest` (XHR) call.
+XHR calls within a test are rare so you can generally stick with [`fakeAsync()`](#fake-async).
+But if you ever do need to call `XMLHttpRequest`, you'll want to know about `async()`.
 
 <div class="alert is-helpful">
 

aio/content/guide/typescript-configuration.md

@@ -28,9 +28,34 @@ For details about `tsconfig.json`, see the official
 
 </div>
 
-The [Setup](guide/setup-local) guide uses the following `tsconfig.json`:
+The initial `tsconfig.json` for an Angular app typically looks like this example:
+
+
+<code-example lang="json" header="tsconfig.json" linenums="false">
+   {
+    "compileOnSave": false,
+    "compilerOptions": {
+    "compilerOptions": {
+      "baseUrl": "./",
+      "outDir": "./dist/out-tsc",
+      "sourceMap": true,
+      "declaration": false,
+      "module": "es2015",
+      "moduleResolution": "node",
+      "emitDecoratorMetadata": true,
+      "experimentalDecorators": true,
+      "importHelpers": true,
+      "target": "es5",
+      "typeRoots": [
+        "node_modules/@types"
+      ],
+      "lib": [
+        "es2018",
+        "dom"
+      ]
+    }
+</code-example>
 
-<code-example path="getting-started/tsconfig.0.json" header="tsconfig.json"></code-example>
 
 This file contains options and flags that are essential for Angular applications.
 

aio/content/guide/upgrade-performance.md

@@ -216,7 +216,7 @@ the recipe.
 
 In order to start using any `upgrade/static` APIs, you still need to load the Angular framework as
 you would in a normal Angular app. You can see how this can be done with SystemJS by following the
-instructions in the [Setup](guide/setup) guide, selectively copying code from the
+instructions in the [Upgrade Setup](guide/upgrade-setup "Setup for Upgrading from AngularJS") guide, selectively copying code from the
 [QuickStart github repository](https://github.com/angular/quickstart).
 
 You also need to install the `@angular/upgrade` package via `npm install @angular/upgrade --save`

aio/content/guide/upgrade-setup.md

@@ -1,15 +1,15 @@
 # Setup for Upgrading from AngularJS
 
-<!-- 
+<!--
 Question: Can we remove this file and instead direct readers to https://github.com/angular/quickstart/blob/master/README.md
 -->
 
 <div class="alert is-critical">
 
-**Audience:** Use this guide **only** in the context of  [Upgrading from AngularJS](guide/upgrade "Upgrading from AngularJS to Angular") or [Upgrading for Performance](guide/upgrade-performance "Upgrading for Performance"). 
-Those Upgrade guides refer to this Setup guide for information about using the [deprecated QuickStart GitHub repository](https://github.com/angular/quickstart "Deprecated Angular QuickStart GitHub repository"), which was created prior to the current Angular [CLI](cli "CLI Overview"). 
+**Audience:** Use this guide **only** in the context of  [Upgrading from AngularJS](guide/upgrade "Upgrading from AngularJS to Angular") or [Upgrading for Performance](guide/upgrade-performance "Upgrading for Performance").
+Those Upgrade guides refer to this Setup guide for information about using the [deprecated QuickStart GitHub repository](https://github.com/angular/quickstart "Deprecated Angular QuickStart GitHub repository"), which was created prior to the current Angular [CLI](cli "CLI Overview").
 
-**For all other scenarios,** see the current instructions in [Local Environment Setup](guide/setup-local "Setting up for Local Development").
+**For all other scenarios,** see the current instructions in [Setting up the Local Environment and Workspace](guide/setup-local "Setting up for Local Development").
 
 
 </div>
@@ -139,6 +139,11 @@ Consequently, there are many files in the project folder on your machine,
 most of which you can [learn about later](guide/file-structure).
 
 
+<div class="alert is-helpful">
+
+**Reminder:** The "QuickStart seed" example was created prior to the Angular CLI, so there are some differences between what is described here and an Angular CLI application.
+
+</div>
 
 {@a app-files}
 
@@ -265,8 +270,8 @@ The following are all in `src/`
 
 
       Defines `AppModule`, the  [root module](guide/bootstrapping "AppModule: the root module") that tells Angular how to assemble the application.
-      Right now it declares only the `AppComponent`.
-      Soon there will be more components to declare.
+      When initially created, it declares only the `AppComponent`.
+      Over time, you add more components to declare.
     </td>
 
   </tr>
@@ -284,8 +289,8 @@ The following are all in `src/`
       [bootstraps](guide/bootstrapping)
       the application's main module (`AppModule`) to run in the browser.
       The JIT compiler is a reasonable choice during the development of most projects and
-      it's the only viable choice for a sample running in a _live-coding_ environment like Stackblitz.
-      You'll learn about alternative compiling and [deployment](guide/deployment) options later in the documentation.
+      it's the only viable choice for a sample running in a _live-coding_ environment such as Stackblitz.
+      Alternative [compilation](guide/aot-compiler), [build](guide/build), and [deployment](guide/deployment) options are available.
 
     </td>
 
@@ -294,43 +299,6 @@ The following are all in `src/`
 </table>
 
 
-
-<div class="alert is-helpful">
-
-
-
-### Next Step
-
-If you're new to Angular, we recommend you follow the [tutorial](tutorial "Tour of Heroes tutorial").
-
-
-</div>
-
-<br></br><br></br>
-
-{@a install-prerequisites}
-
-
-
-## Appendix: Node.js and npm
-
-
-[Node.js](https://nodejs.org/en/) and the [npm](https://www.npmjs.com/) package manager are essential to modern web development with Angular and other platforms.
-Node.js powers client development and build tools.
-The _npm_ package manager, which is itself a _Node.js_ application, installs JavaScript libraries.
-
-<a href="https://docs.npmjs.com/getting-started/installing-node" target="_blank" title="Installing Node.js and updating npm">
-Get them now</a> if they're not already installed on your machine.
-
-**Verify that you are running Node.js `v8.x` or higher and npm `5.x` or higher**
-by running the commands `node -v` and `npm -v` in a terminal/console window.
-Older versions produce errors.
-
-We recommend [nvm](https://github.com/creationix/nvm) for managing multiple versions of Node.js and npm.
-You may need [nvm](https://github.com/creationix/nvm) if you already have projects running on your machine that use other versions of Node.js and npm.
-
-
-
 ## Appendix: Develop locally with IE
 
 If you develop angular locally with `ng serve`, a `websocket` connection is set up automatically between browser and local dev server, so when your code changes, the browser can automatically refresh.

aio/content/guide/upgrade.md

@@ -422,8 +422,7 @@ will result in the same thing:
 </code-example>
 
 To begin converting your AngularJS application to a hybrid, you need to load the Angular framework.
-You can see how this can be done with SystemJS by following the instructions in [Setup](guide/setup),
-selectively copying code from the [QuickStart github repository](https://github.com/angular/quickstart).
+You can see how this can be done with SystemJS by following the instructions in [Setup for Upgrading to AngularJS](guide/upgrade-setup) for selectively copying code from the [QuickStart github repository](https://github.com/angular/quickstart).
 
 You also need to install the `@angular/upgrade` package via `npm install @angular/upgrade --save`
 and add a mapping for the `@angular/upgrade/static` package:
@@ -1311,7 +1310,7 @@ Turn to the [Angular animations](guide/animations) guide to learn about that.
 </div>
 
 Install Angular into the project, along with the SystemJS module loader.
-Take a look at the results of the [Setup](guide/setup) instructions
+Take a look at the results of the [upgrade setup instructions](guide/upgrade-setup)
 and get the following configurations from there:
 
 * Add Angular and the other new dependencies to `package.json`
@@ -1352,7 +1351,7 @@ to load the actual application:
 </code-example>
 
 You also need to make a couple of adjustments
-to the `systemjs.config.js` file installed during [setup](guide/setup).
+to the `systemjs.config.js` file installed during [upgrade setup](guide/upgrade-setup).
 
 Point the browser to the project root when loading things through SystemJS,
 instead of using the  `<base>` URL.

aio/content/images/guide/dependency-injection/injectors.svg

@@ -0,0 +1 @@
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aio/content/marketing/contributors.json

@@ -276,8 +276,7 @@
     "twitter": "deborahkurata",
     "website": "http://blogs.msmvps.com/deborahk/",
     "bio": "Deborah is a software developer, author, and Google Developer Expert. She is author of several Pluralsight courses including: 'Angular 2: Getting Started' and ‘Angular Routing’",
-    "groups": ["Collaborators", "GDE"],
-    "mentor": "kara"
+    "groups": ["GDE"]
   },
   "alyssa": {
     "name": "Alyssa Nicoll",

aio/content/marketing/resources.json

@@ -265,6 +265,12 @@
             "title": "Angular UI Toolkit",
             "url": "https://www.angular-ui-tools.com"
           },
+          "SenchaforAngular": {
+            "desc": "Build modern web apps faster with 115+ pre-built UI components. Try for free and download today.",
+            "rev": true,
+            "title": "Sencha for Angular",
+            "url": "https://www.sencha.com/products/extangular/"
+          },
           "IgniteUIforAngular": {
             "desc": "Ignite UI for Angular is a dependency-free Angular toolkit for building modern web apps.",
             "rev": true,

aio/content/navigation.json

@@ -506,6 +506,12 @@
           "title": "Upgrading from AngularJS",
           "tooltip": "Incrementally upgrade an AngularJS application to Angular.",
           "children": [
+            {
+              "url": "guide/upgrade-setup",
+              "title": "Setup for Upgrading from AngularJS",
+              "tooltip": "Use code from the Angular QuickStart seed as part of upgrading from AngularJS.",
+              "hidden": true
+            },
             {
               "url": "guide/upgrade",
               "title": "Upgrading Instructions",
@@ -573,7 +579,7 @@
         {
           "url": "guide/ivy",
           "title": "Angular Ivy",
-          "tooltip": "Opting into Angular Ivy with Angular CLI."
+          "tooltip": "Opting out of Angular Ivy with Angular CLI."
         },
         {
           "url": "guide/web-worker",
@@ -587,21 +593,32 @@
       "tooltip": "Build, testing, and deployment information.",
       "children": [
         {
-          "url": "guide/setup",
+          "url": "guide/upgrade-setup",
           "title": "Upgrade setup",
           "tooltip": "How to set up the Angular QuickStart seed in the context of upgrading from AngularJS.",
           "hidden": true
         },
         {
-          "url": "guide/aot-compiler",
-          "title": "Ahead-of-Time Compilation",
-          "tooltip": "Learn why and how to use the Ahead-of-Time (AOT) compiler."
-        },
-        {
-          "url": "guide/angular-compiler-options",
-          "title": "Compiler Options",
-          "tooltip": "Configuration options for the AOT compiler."
-        },
+          "title": "AoT Compiler",
+          "tooltip": "Understanding ahead-of-time compilation.",
+          "children": [
+            {
+              "url": "guide/aot-compiler",
+              "title": "Ahead-of-Time Compilation",
+              "tooltip": "Learn why and how to use the Ahead-of-Time (AoT) compiler."
+            },
+            {
+              "url": "guide/angular-compiler-options",
+              "title": "Angular Compiler Options",
+              "tooltip": "Configuring AoT compilation."
+           },
+           {
+              "url": "guide/aot-metadata-errors",
+              "title": "AoT Metadata Errors",
+              "tooltip": "Troubleshooting AoT compilation."
+           }
+        ]
+      },
         {
           "url": "guide/build",
           "title": "Building & Serving",