diff --git a/.circleci/config.yml b/.circleci/config.yml
index 31c1f4e11b..24335167d0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -293,6 +293,8 @@ jobs:
       - run: yarn --cwd aio e2e --configuration=ci
         # Run PWA-score tests
       - run: yarn --cwd aio test-pwa-score-localhost $CI_AIO_MIN_PWA_SCORE
+        # Run accessibility tests
+      - run: yarn --cwd aio test-a11y-score-localhost
         # Check the bundle sizes.
       - run: yarn --cwd aio payload-size
         # Run unit tests for Firebase redirects
diff --git a/aio/package.json b/aio/package.json
index 79bf03ec0b..3af574929a 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -33,8 +33,10 @@
     "set-opensearch-url": "node --eval \"const sh = require('shelljs'); sh.set('-e'); sh.sed('-i', /PLACEHOLDER_URL/g, process.argv[1], 'dist/assets/opensearch.xml');\"",
     "presmoke-tests": "yarn update-webdriver",
     "smoke-tests": "protractor tests/deployment/e2e/protractor.conf.js --suite smoke --baseUrl",
+    "test-a11y-score": "node scripts/test-aio-a11y",
+    "test-a11y-score-localhost": "run-p --race \"~~light-server -s dist -p 4200 --quiet\" \"test-a11y-score http://localhost:4200\" --",
     "test-pwa-score": "run-s \"~~audit-web-app {1} all:0,pwa:{2} {3}\" --",
-    "test-pwa-score-localhost": "run-p --race \"~~http-server dist -p 4200 --silent\" \"test-pwa-score http://localhost:4200 {1} {2}\" --",
+    "test-pwa-score-localhost": "run-p --race \"~~light-server -s dist -p 4200 --quiet\" \"test-pwa-score http://localhost:4200 {1} {2}\" --",
     "example-e2e": "yarn example-check-local && node ./tools/examples/run-example-e2e",
     "example-lint": "tslint --config \"content/examples/tslint.json\" \"content/examples/**/*.ts\" --exclude \"content/examples/styleguide/**/*.avoid.ts\"",
     "example-use-local": "node tools/ng-packages-installer overwrite ./tools/examples/shared --debug",
@@ -69,7 +71,7 @@
     "~~clean-generated": "node --eval \"require('shelljs').rm('-rf', 'src/generated')\"",
     "~~build": "ng build --configuration=stable",
     "post~~build": "yarn build-404-page",
-    "~~http-server": "http-server"
+    "~~light-server": "light-server --bind=localhost --historyindex=/index.html --no-reload"
   },
   "engines": {
     "node": ">=10.9.0 <11.0.0",
@@ -124,7 +126,6 @@
     "hast-util-is-element": "^1.0.0",
     "hast-util-to-string": "^1.0.0",
     "html": "^1.0.0",
-    "http-server": "^0.11.1",
     "ignore": "^3.3.3",
     "image-size": "^0.5.1",
     "jasmine": "^2.6.0",
@@ -141,6 +142,7 @@
     "karma-coverage-istanbul-reporter": "^1.3.0",
     "karma-jasmine": "^1.1.0",
     "karma-jasmine-html-reporter": "^0.2.2",
+    "light-server": "^2.6.2",
     "lighthouse": "^5.1.0",
     "lighthouse-logger": "^1.2.0",
     "lodash": "^4.17.4",
diff --git a/aio/scripts/test-aio-a11y.js b/aio/scripts/test-aio-a11y.js
new file mode 100644
index 0000000000..f4c89aae0a
--- /dev/null
+++ b/aio/scripts/test-aio-a11y.js
@@ -0,0 +1,38 @@
+#!/bin/env node
+'use strict';
+
+/**
+ * Usage:
+ * ```sh
+ * node scripts/test-aio-a11y <origin>
+ * ```
+ *
+ * Runs accessibility audits on several (pre-defined) pages on the specified origin. It fails, if
+ * the score for any page is below the minimum (see `MIN_SCORES_PER_PAGE` below).
+ *
+ * `<origin>` is the origin (scheme + hostname + port) of an angular.io deployment. It can be remote
+ * (e.g. `https://next.angular.io`) or local (e.g. `http://localhost:4200`).
+ */
+
+// Imports
+const sh = require('shelljs');
+sh.set('-e');
+
+// Constants
+const MIN_SCORES_PER_PAGE = {
+  '': 100,
+  'api': 90,
+  'api/core/Directive': 90,
+  'cli': 91,
+  'cli/add': 91,
+  'docs': 100,
+  'guide/docs-style-guide': 88,
+  'start': 90,
+};
+
+// Run
+const auditWebAppCmd = `"${process.execPath}" "${__dirname}/audit-web-app"`;
+const origin = process.argv[2];
+for (const [page, minScore] of Object.entries(MIN_SCORES_PER_PAGE)) {
+  sh.exec(`${auditWebAppCmd} ${origin}/${page} accessibility:${minScore}`);
+}
diff --git a/aio/scripts/test-production.sh b/aio/scripts/test-production.sh
index a79ee210c9..bd5b534680 100755
--- a/aio/scripts/test-production.sh
+++ b/aio/scripts/test-production.sh
@@ -25,5 +25,8 @@ set +x -eu -o pipefail
   # Run PWA-score tests.
   yarn test-pwa-score "$targetUrl" "$minPwaScore"
 
+  # Run a11y tests.
+  yarn test-a11y-score "$targetUrl"
+
   echo -e "\nAll checks passed!"
 )
diff --git a/aio/yarn.lock b/aio/yarn.lock
index 1a9df8f1e5..c35cad3ad4 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -2345,6 +2345,16 @@ connect-history-api-fallback@^1.6.0:
   resolved "https://registry.yarnpkg.com/connect-history-api-fallback/-/connect-history-api-fallback-1.6.0.tgz#8b32089359308d111115d81cad3fceab888f97bc"
   integrity sha512-e54B99q/OUoH64zYYRf3HBP5z24G38h5D3qXu23JGRoigpX5Ss4r9ZnDk3g0Z8uQC2x2lPaJ+UlWBc1ZWBWdLg==
 
+connect-injector@^0.4.4:
+  version "0.4.4"
+  resolved "https://registry.yarnpkg.com/connect-injector/-/connect-injector-0.4.4.tgz#a81959c31ecf5caa0f3dcc325c28ed90b830aa90"
+  integrity sha1-qBlZwx7PXKoPPcwyXCjtkLgwqpA=
+  dependencies:
+    debug "^2.0.0"
+    q "^1.0.1"
+    stream-buffers "^0.2.3"
+    uberproto "^1.1.0"
+
 connect-query@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/connect-query/-/connect-query-1.0.0.tgz#de44f577209da2404d1fc04692d1a4118e582119"
@@ -2360,6 +2370,16 @@ connect@^3.6.0, connect@^3.6.2:
     parseurl "~1.3.2"
     utils-merge "1.0.1"
 
+connect@^3.6.6:
+  version "3.7.0"
+  resolved "https://registry.yarnpkg.com/connect/-/connect-3.7.0.tgz#5d49348910caa5e07a01800b030d0c35f20484f8"
+  integrity sha512-ZqRXc+tZukToSNmh5C2iWMSoV3X1YUcPbqEM4DkEG5tNQXrQUZCNVGGv3IuicnkMtPfGf3Xtp8WCXs295iQ1pQ==
+  dependencies:
+    debug "2.6.9"
+    finalhandler "1.1.2"
+    parseurl "~1.3.3"
+    utils-merge "1.0.1"
+
 console-browserify@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/console-browserify/-/console-browserify-1.1.0.tgz#f0241c45730a9fc6323b206dbf38edc741d0bb10"
@@ -2482,10 +2502,6 @@ core-util-is@1.0.2, core-util-is@~1.0.0:
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
   integrity sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=
 
-corser@~2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/corser/-/corser-2.0.1.tgz#8eda252ecaab5840dcd975ceb90d9370c819ff87"
-
 cosmiconfig@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/cosmiconfig/-/cosmiconfig-4.0.0.tgz#760391549580bbd2df1e562bc177b13c290972dc"
@@ -2722,7 +2738,7 @@ debug@2.3.3:
   dependencies:
     ms "0.7.2"
 
-debug@2.6.9, debug@^2.1.1, debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8:
+debug@2.6.9, debug@^2.0.0, debug@^2.1.1, debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   integrity sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
@@ -2915,7 +2931,7 @@ detect-libc@^1.0.2:
   resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
   integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
 
-detect-node@^2.0.4:
+detect-node@^2.0.3, detect-node@^2.0.4:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/detect-node/-/detect-node-2.0.4.tgz#014ee8f8f669c5c58023da64b8179c083a28c46c"
   integrity sha512-ZIzRpLJrOj7jjP2miAtgqIfmzbxa4ZOr5jJc601zklsfEx9oTzmmj2nVpIPRpNlRTIh8lc1kyViIY7BWSGNmKw==
@@ -3147,16 +3163,6 @@ ecdsa-sig-formatter@1.0.9:
     base64url "^2.0.0"
     safe-buffer "^5.0.1"
 
-ecstatic@^3.0.0:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/ecstatic/-/ecstatic-3.3.1.tgz#b15b5b036c2233defc78d7bacbd8765226c95577"
-  integrity sha512-/rrctvxZ78HMI/tPIsqdvFKHHscxR3IJuKrZI2ZoUgkt2SiufyLFBmcco+aqQBIu6P1qBsUNG3drAAGLx80vTQ==
-  dependencies:
-    he "^1.1.1"
-    mime "^1.6.0"
-    minimist "^1.1.0"
-    url-join "^2.0.5"
-
 editions@^1.1.1, editions@^1.1.2, editions@^1.3.1, editions@^1.3.3:
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/editions/-/editions-1.3.3.tgz#0907101bdda20fac3cbe334c27cbd0688dc99a5b"
@@ -3931,7 +3937,7 @@ finalhandler@1.1.1:
     statuses "~1.4.0"
     unpipe "~1.0.0"
 
-finalhandler@~1.1.2:
+finalhandler@1.1.2, finalhandler@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/finalhandler/-/finalhandler-1.1.2.tgz#b7e7d000ffd11938d0fdb053506f6ebabe9f587d"
   integrity sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==
@@ -4221,6 +4227,13 @@ gauge@~2.7.3:
     strip-ansi "^3.0.1"
     wide-align "^1.1.0"
 
+gaze@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/gaze/-/gaze-1.1.3.tgz#c441733e13b927ac8c0ff0b4c3b033f28812924a"
+  integrity sha512-BRdNm8hbWzFzWHERTrejLqwHDfS4GibPoq5wjTPIoJHoBtKGPg3xAFfxmM+9ztbXelxcf2hwQcaz1PtmFeue8g==
+  dependencies:
+    globule "^1.0.0"
+
 gcp-metadata@^0.3.0:
   version "0.3.1"
   resolved "https://registry.yarnpkg.com/gcp-metadata/-/gcp-metadata-0.3.1.tgz#313814456e7c3d0eeb8f8b084b33579e886f829a"
@@ -4348,7 +4361,7 @@ glob@7.0.x:
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
-glob@7.1.4:
+glob@7.1.4, glob@~7.1.1:
   version "7.1.4"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.4.tgz#aa608a2f6c577ad357e1ae5a5c26d9a8d1969255"
   integrity sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==
@@ -4415,6 +4428,15 @@ globby@^7.1.1:
     pify "^3.0.0"
     slash "^1.0.0"
 
+globule@^1.0.0:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/globule/-/globule-1.2.1.tgz#5dffb1b191f22d20797a9369b49eab4e9839696d"
+  integrity sha512-g7QtgWF4uYSL5/dn71WxubOrS7JVGCnFPEnoeChJmBnyR9Mw8nGoEwOgJL/RC2Te0WhbsEUCejfH8SZNJ+adYQ==
+  dependencies:
+    glob "~7.1.1"
+    lodash "~4.17.10"
+    minimatch "~3.0.2"
+
 google-auth-library@0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/google-auth-library/-/google-auth-library-0.12.0.tgz#a3fc6c296d00bb54e4d877ef581a05947330d07f"
@@ -4551,6 +4573,11 @@ gtoken@^2.3.0:
     mime "^2.2.0"
     pify "^3.0.0"
 
+handle-thing@^1.2.5:
+  version "1.2.5"
+  resolved "https://registry.yarnpkg.com/handle-thing/-/handle-thing-1.2.5.tgz#fd7aad726bf1a5fd16dfc29b2f7a6601d27139c4"
+  integrity sha1-/Xqtcmvxpf0W38KbL3pmAdJxOcQ=
+
 handle-thing@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/handle-thing/-/handle-thing-2.0.0.tgz#0e039695ff50c93fc288557d696f3c1dc6776754"
@@ -4808,11 +4835,6 @@ hawk@~6.0.2:
     hoek "4.x.x"
     sntp "2.x.x"
 
-he@^1.1.1:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
-  integrity sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==
-
 header-case@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/header-case/-/header-case-1.0.1.tgz#9535973197c144b09613cd65d317ef19963bd02d"
@@ -4963,7 +4985,7 @@ http-proxy-middleware@^0.19.1:
     lodash "^4.17.11"
     micromatch "^3.1.10"
 
-http-proxy@1.16.2, http-proxy@^1.13.0, http-proxy@^1.8.1:
+http-proxy@1.16.2, http-proxy@^1.13.0:
   version "1.16.2"
   resolved "https://registry.yarnpkg.com/http-proxy/-/http-proxy-1.16.2.tgz#06dff292952bf64dbe8471fa9df73066d4f37742"
   dependencies:
@@ -4979,20 +5001,6 @@ http-proxy@^1.17.0:
     follow-redirects "^1.0.0"
     requires-port "^1.0.0"
 
-http-server@^0.11.1:
-  version "0.11.1"
-  resolved "https://registry.yarnpkg.com/http-server/-/http-server-0.11.1.tgz#2302a56a6ffef7f9abea0147d838a5e9b6b6a79b"
-  integrity sha512-6JeGDGoujJLmhjiRGlt8yK8Z9Kl0vnl/dQoQZlc4oeqaUoAKQg94NILLfrY3oWzSyFaQCVNTcKE5PZ3cH8VP9w==
-  dependencies:
-    colors "1.0.3"
-    corser "~2.0.0"
-    ecstatic "^3.0.0"
-    http-proxy "^1.8.1"
-    opener "~1.4.0"
-    optimist "0.6.x"
-    portfinder "^1.0.13"
-    union "~0.4.3"
-
 http-signature@~1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/http-signature/-/http-signature-1.2.0.tgz#9aecd925114772f3d95b65a60abb8f7c18fbace1"
@@ -6291,6 +6299,26 @@ lie@~3.3.0:
   dependencies:
     immediate "~3.0.5"
 
+light-server@^2.6.2:
+  version "2.6.2"
+  resolved "https://registry.yarnpkg.com/light-server/-/light-server-2.6.2.tgz#dcca50484cab293be03679d083301a77a8d4fe0e"
+  integrity sha512-u0t8YBTAZkBs9td6/UKHe3qP8VwT7LpKVp9kzdisOllhVzaiLukSGh6JlOLVKW62uMu2bZzoogssjTYuc7XNrQ==
+  dependencies:
+    commander "^2.19.0"
+    connect "^3.6.6"
+    connect-history-api-fallback "^1.6.0"
+    connect-injector "^0.4.4"
+    gaze "^1.1.3"
+    http-proxy "^1.17.0"
+    morgan "~1.9.1"
+    opener "^1.5.1"
+    parseurl "^1.3.2"
+    serve-index "^1.9.1"
+    serve-static "~1.13.2"
+    spdy "^3.4.7"
+    strip-json-comments "^2.0.1"
+    ws "^1.0.1"
+
 lighthouse-logger@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/lighthouse-logger/-/lighthouse-logger-1.0.1.tgz#f073d83f7acbc96729bf100a121c8f006991ae61"
@@ -6509,7 +6537,7 @@ lodash@^3.10.1, lodash@^3.8.0:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
   integrity sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y=
 
-lodash@^4.0.0, lodash@^4.13.1, lodash@^4.14.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.4, lodash@^4.17.5:
+lodash@^4.0.0, lodash@^4.13.1, lodash@^4.14.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.4, lodash@^4.17.5, lodash@~4.17.10:
   version "4.17.11"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.11.tgz#b39ea6229ef607ecd89e2c8df12536891cac9b8d"
   integrity sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==
@@ -6889,7 +6917,7 @@ mime@1.4.1, mime@^1.3.4:
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.4.1.tgz#121f9ebc49e3766f311a76e1fa1c8003c4b03aa6"
   integrity sha512-KI1+qOZu5DcW6wayYHSzR/tXKCDC5Om4s1z2QJjDULzLcmf3DvzS7oluY4HCTrc+9FiKmWUgeNLg7W3uIQvxtQ==
 
-mime@1.6.0, mime@^1.4.1, mime@^1.6.0:
+mime@1.6.0, mime@^1.4.1:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.6.0.tgz#32cd9e5c64553bd58d19a568af452acff04981b1"
   integrity sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==
@@ -6937,7 +6965,7 @@ minimalistic-crypto-utils@^1.0.0, minimalistic-crypto-utils@^1.0.1:
   resolved "https://registry.yarnpkg.com/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz#f6c00c1c0b082246e5c4d99dfb8c7c083b2b582a"
   integrity sha1-9sAMHAsIIkblxNmd+4x8CDsrWCo=
 
-minimatch@3.0.4, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4:
+minimatch@3.0.4, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4, minimatch@~3.0.2:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==
@@ -7034,6 +7062,17 @@ morgan@^1.8.2:
     on-finished "~2.3.0"
     on-headers "~1.0.1"
 
+morgan@~1.9.1:
+  version "1.9.1"
+  resolved "https://registry.yarnpkg.com/morgan/-/morgan-1.9.1.tgz#0a8d16734a1d9afbc824b99df87e738e58e2da59"
+  integrity sha512-HQStPIV4y3afTiCYVxirakhlCfGkI161c76kKFca7Fk1JusM//Qeo1ej2XaMniiNeaZklMVrh3vTtIzpzwbpmA==
+  dependencies:
+    basic-auth "~2.0.0"
+    debug "2.6.9"
+    depd "~1.1.2"
+    on-finished "~2.3.0"
+    on-headers "~1.0.1"
+
 move-concurrently@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/move-concurrently/-/move-concurrently-1.0.1.tgz#be2c005fda32e0b29af1f05d7c4b33214c701f92"
@@ -7493,7 +7532,7 @@ objectdiff@^1.1.0:
   resolved "https://registry.yarnpkg.com/objectdiff/-/objectdiff-1.1.0.tgz#8d7a15be6cb8670df8a490cc6be12a4f05ea82f4"
   integrity sha1-jXoVvmy4Zw34pJDMa+EqTwXqgvQ=
 
-obuf@^1.0.0, obuf@^1.1.2:
+obuf@^1.0.0, obuf@^1.1.1, obuf@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/obuf/-/obuf-1.1.2.tgz#09bea3343d41859ebd446292d11c9d4db619084e"
   integrity sha512-PX1wu0AmAdPqOL1mWhqmlOd8kOIZQwGZw6rh7uby9fTc5lhaOWFLX3I6R1hrF9k3zUY40e6igsLGkDXK92LJNg==
@@ -7537,9 +7576,10 @@ open@6.3.0:
   dependencies:
     is-wsl "^1.1.0"
 
-opener@~1.4.0:
-  version "1.4.3"
-  resolved "https://registry.yarnpkg.com/opener/-/opener-1.4.3.tgz#5c6da2c5d7e5831e8ffa3964950f8d6674ac90b8"
+opener@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/opener/-/opener-1.5.1.tgz#6d2f0e77f1a0af0032aca716c2c1fbb8e7e8abed"
+  integrity sha512-goYSy5c2UXE4Ra1xixabeVh1guIX/ZV/YokJksb6q2lubWu6UbvPQ20p542/sFIll1nl8JnCyK9oBaOcCWXwvA==
 
 opn@4.0.2:
   version "4.0.2"
@@ -7561,7 +7601,7 @@ opn@^5.5.0:
   dependencies:
     is-wsl "^1.1.0"
 
-optimist@0.6.x, optimist@^0.6.1, optimist@~0.6.0, optimist@~0.6.1:
+optimist@^0.6.1, optimist@~0.6.0, optimist@~0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/optimist/-/optimist-0.6.1.tgz#da3ea74686fa21a19a111c326e90eb15a0196686"
   dependencies:
@@ -7887,16 +7927,16 @@ parseuri@0.0.5:
   dependencies:
     better-assert "~1.0.0"
 
+parseurl@^1.3.2, parseurl@~1.3.3:
+  version "1.3.3"
+  resolved "https://registry.yarnpkg.com/parseurl/-/parseurl-1.3.3.tgz#9da19e7bee8d12dff0513ed5b76957793bc2e8d4"
+  integrity sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==
+
 parseurl@~1.3.2:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/parseurl/-/parseurl-1.3.2.tgz#fc289d4ed8993119460c156253262cdc8de65bf3"
   integrity sha1-/CidTtiZMRlGDBViUyYs3I3mW/M=
 
-parseurl@~1.3.3:
-  version "1.3.3"
-  resolved "https://registry.yarnpkg.com/parseurl/-/parseurl-1.3.3.tgz#9da19e7bee8d12dff0513ed5b76957793bc2e8d4"
-  integrity sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==
-
 pascal-case@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/pascal-case/-/pascal-case-2.0.1.tgz#2d578d3455f660da65eca18ef95b4e0de912761e"
@@ -8337,7 +8377,7 @@ q@1.4.1:
   resolved "https://registry.yarnpkg.com/q/-/q-1.4.1.tgz#55705bcd93c5f3673530c2c2cbc0c2b3addc286e"
   integrity sha1-VXBbzZPF82c1MMLCy8DCs63cKG4=
 
-q@^1.4.1, q@^1.5.1:
+q@^1.0.1, q@^1.4.1, q@^1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"
   integrity sha1-fjL3W0E4EpHQRhHxvxQQmsAGUdc=
@@ -8360,10 +8400,6 @@ qs@6.7.0:
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.7.0.tgz#41dc1a015e3d581f1621776be31afb2876a9b1bc"
   integrity sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==
 
-qs@~2.3.3:
-  version "2.3.3"
-  resolved "https://registry.yarnpkg.com/qs/-/qs-2.3.3.tgz#e9e85adbe75da0bbe4c8e0476a086290f863b404"
-
 qs@~6.4.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.4.0.tgz#13e26d28ad6b0ffaa91312cd3bf708ed351e7233"
@@ -8586,7 +8622,7 @@ read@1.0.x:
   dependencies:
     mute-stream "~0.0.4"
 
-"readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.3, readable-stream@^2.3.6, readable-stream@~2.3.6:
+"readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.2.9, readable-stream@^2.3.3, readable-stream@^2.3.6, readable-stream@~2.3.6:
   version "2.3.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
   integrity sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==
@@ -9392,7 +9428,7 @@ serve-index@^1.9.1:
     mime-types "~2.1.17"
     parseurl "~1.3.2"
 
-serve-static@1.13.2:
+serve-static@1.13.2, serve-static@~1.13.2:
   version "1.13.2"
   resolved "https://registry.yarnpkg.com/serve-static/-/serve-static-1.13.2.tgz#095e8472fd5b46237db50ce486a43f4b86c6cec1"
   integrity sha512-p/tdJrO4U387R9oMjb1oj7qSMaMfmOyd4j9hOFoxZe2baQszgHcSWjuya/CiT5kgZZKRudHNOA0pYXOl8rQ5nw==
@@ -9812,6 +9848,19 @@ spdx-license-list@^2.1.0:
   resolved "https://registry.yarnpkg.com/spdx-license-list/-/spdx-license-list-2.1.0.tgz#3788ffb5c80b24afbe8283934e9e6684ea6a218d"
   integrity sha1-N4j/tcgLJK++goOTTp5mhOpqIY0=
 
+spdy-transport@^2.0.18:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/spdy-transport/-/spdy-transport-2.1.1.tgz#c54815d73858aadd06ce63001e7d25fa6441623b"
+  integrity sha512-q7D8c148escoB3Z7ySCASadkegMmUZW8Wb/Q1u0/XBgDKMO880rLQDj8Twiew/tYi7ghemKUi/whSYOwE17f5Q==
+  dependencies:
+    debug "^2.6.8"
+    detect-node "^2.0.3"
+    hpack.js "^2.1.6"
+    obuf "^1.1.1"
+    readable-stream "^2.2.9"
+    safe-buffer "^5.0.1"
+    wbuf "^1.7.2"
+
 spdy-transport@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/spdy-transport/-/spdy-transport-3.0.0.tgz#00d4863a6400ad75df93361a1608605e5dcdcf31"
@@ -9824,6 +9873,18 @@ spdy-transport@^3.0.0:
     readable-stream "^3.0.6"
     wbuf "^1.7.3"
 
+spdy@^3.4.7:
+  version "3.4.7"
+  resolved "https://registry.yarnpkg.com/spdy/-/spdy-3.4.7.tgz#42ff41ece5cc0f99a3a6c28aabb73f5c3b03acbc"
+  integrity sha1-Qv9B7OXMD5mjpsKKq7c/XDsDrLw=
+  dependencies:
+    debug "^2.6.8"
+    handle-thing "^1.2.5"
+    http-deceiver "^1.2.7"
+    safe-buffer "^5.0.1"
+    select-hose "^2.0.0"
+    spdy-transport "^2.0.18"
+
 spdy@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/spdy/-/spdy-4.0.0.tgz#81f222b5a743a329aa12cea6a390e60e9b613c52"
@@ -9933,6 +9994,11 @@ stream-browserify@^2.0.1:
     inherits "~2.0.1"
     readable-stream "^2.0.2"
 
+stream-buffers@^0.2.3:
+  version "0.2.6"
+  resolved "https://registry.yarnpkg.com/stream-buffers/-/stream-buffers-0.2.6.tgz#181c08d5bb3690045f69401b9ae6a7a0cf3313fc"
+  integrity sha1-GBwI1bs2kARfaUAbmuanoM8zE/w=
+
 stream-each@^1.1.0:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/stream-each/-/stream-each-1.2.3.tgz#ebe27a0c389b04fbcc233642952e10731afa9bae"
@@ -10119,7 +10185,7 @@ strip-eof@^1.0.0:
   resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"
   integrity sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=
 
-strip-json-comments@^2.0.0, strip-json-comments@~2.0.1:
+strip-json-comments@^2.0.0, strip-json-comments@^2.0.1, strip-json-comments@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
   integrity sha1-PFMZQukIwml8DsNEhYwobHygpgo=
@@ -10672,6 +10738,11 @@ typescript@^3.2.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.2.tgz#9ed4e6475d906f589200193be056f5913caed481"
   integrity sha512-Og2Vn6Mk7JAuWA1hQdDQN/Ekm/SchX80VzLhjKN9ETYrIepBFAd8PkOdOTK2nKt0FCkmMZKBJvQ1dV1gIxPu/A==
 
+uberproto@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/uberproto/-/uberproto-1.2.0.tgz#61d4eab024f909c4e6ea52be867c4894a4beeb76"
+  integrity sha1-YdTqsCT5CcTm6lK+hnxIlKS+63Y=
+
 uglify-js@^3.0.15, uglify-js@^3.1.4:
   version "3.4.9"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.4.9.tgz#af02f180c1207d76432e473ed24a28f4a782bae3"
@@ -10741,12 +10812,6 @@ union-value@^1.0.0:
     is-extendable "^0.1.1"
     set-value "^0.4.3"
 
-union@~0.4.3:
-  version "0.4.6"
-  resolved "https://registry.yarnpkg.com/union/-/union-0.4.6.tgz#198fbdaeba254e788b0efcb630bc11f24a2959e0"
-  dependencies:
-    qs "~2.3.3"
-
 unique-filename@^1.1.0, unique-filename@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/unique-filename/-/unique-filename-1.1.1.tgz#1d69769369ada0583103a1e6ae87681b56573230"
@@ -10938,11 +11003,6 @@ url-join@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/url-join/-/url-join-0.0.1.tgz#1db48ad422d3402469a87f7d97bdebfe4fb1e3c8"
 
-url-join@^2.0.5:
-  version "2.0.5"
-  resolved "https://registry.yarnpkg.com/url-join/-/url-join-2.0.5.tgz#5af22f18c052a000a48d7b82c5e9c2e2feeda728"
-  integrity sha1-WvIvGMBSoACkjXuCxenC4v7tpyg=
-
 url-parse-lax@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-1.0.0.tgz#7af8f303645e9bd79a272e7a14ac68bc0609da73"
@@ -11159,7 +11219,7 @@ watchr@^3.0.1:
     scandirectory "^2.5.0"
     taskgroup "^5.0.1"
 
-wbuf@^1.1.0, wbuf@^1.7.3:
+wbuf@^1.1.0, wbuf@^1.7.2, wbuf@^1.7.3:
   version "1.7.3"
   resolved "https://registry.yarnpkg.com/wbuf/-/wbuf-1.7.3.tgz#c1d8d149316d3ea852848895cb6a0bfe887b87df"
   integrity sha512-O84QOnr0icsbFGLS0O3bI5FswxzRr8/gHwWkDlQFskhSPryQXvrTMxjxGP4+iWYoauLoBvfDpkrOauZ+0iZpDA==
@@ -11517,6 +11577,14 @@ ws@3.3.2:
     safe-buffer "~5.1.0"
     ultron "~1.1.0"
 
+ws@^1.0.1:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-1.1.5.tgz#cbd9e6e75e09fc5d2c90015f21f0c40875e0dd51"
+  integrity sha512-o3KqipXNUdS7wpQzBHSe180lBGO60SoK0yVo3CYJgb2MkobuWuBX6dhkYP5ORCLd55y+SaflMOV5fqAB53ux4w==
+  dependencies:
+    options ">=0.0.5"
+    ultron "1.0.x"
+
 wtf-8@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/wtf-8/-/wtf-8-1.0.0.tgz#392d8ba2d0f1c34d1ee2d630f15d0efb68e1048a"