feat(core): upgrade rxjs to 6.0.0-alpha.4 (#22573)

PR Close #22573

scripts/ci/offline_compiler_test.sh

@@ -8,11 +8,12 @@ set -u -e -o pipefail
 # packages, then install them from the resulting .tgz files later.
 ANGULAR_PKGS=$(npm pack dist/packages-dist/{common,forms,core,compiler,compiler-cli,platform-{browser,server},platform-browser-dynamic,router,http,animations} | awk "{ printf \"$PWD/\"; print }")
 
-TYPESCRIPT_VERSION=typescript@2.7.2
+
 PKGS=(
-  reflect-metadata@0.1.8
-  zone.js@0.8.7
-  rxjs@5.4.2
+  $PWD/node_modules/typescript
+  $PWD/node_modules/reflect-metadata
+  $PWD/node_modules/rxjs
+  $PWD/node_modules/zone.js
   @types/{node@6.0.38,jasmine@2.2.33}
   jasmine@2.4.1
   webpack@2.1.0-beta.21
@@ -33,7 +34,7 @@ cp -v package.json $TMP
 (
   cd $TMP
   set -ex -o pipefail
-  npm install ${PKGS[*]} $TYPESCRIPT_VERSION
+  npm install ${PKGS[*]}
   npm install ${ANGULAR_PKGS[*]}
 
   ./node_modules/.bin/tsc --version