feat(build): optionally build an ES2015 distro (angular#13471)

PR Close angular#13471

build.sh

@@ -112,6 +112,7 @@ do
   PWD=`pwd`
   SRCDIR=${PWD}/modules/@angular/${PACKAGE}
   DESTDIR=${PWD}/dist/packages-dist/${PACKAGE}
+  ES2015_DESTDIR=${PWD}/dist/packages-dist-es2015/${PACKAGE}
   UMD_ES5_PATH=${DESTDIR}/bundles/${PACKAGE}.umd.js
   UMD_TESTING_ES5_PATH=${DESTDIR}/bundles/${PACKAGE}-testing.umd.js
   UMD_STATIC_ES5_PATH=${DESTDIR}/bundles/${PACKAGE}-static.umd.js
@@ -131,6 +132,13 @@ do
 
   echo "======      COMPILING: ${TSC} -p ${SRCDIR}/tsconfig-build.json        ====="
   $TSC -p ${SRCDIR}/tsconfig-build.json
+  # ES2015 distro is not ready yet; don't slow down all builds for it
+  # TODO(alexeagle,igorminar): figure out ES2015 story and enable
+  if [[ -n "${EXPERIMENTAL_ES2015_DISTRO}" ]]; then
+    $TSC -p ${SRCDIR}/tsconfig-build.json --target es2015 --outDir ${ES2015_DESTDIR}
+    cp ${SRCDIR}/package.json ${ES2015_DESTDIR}/
+    cp ${PWD}/modules/@angular/README.md ${ES2015_DESTDIR}/
+  fi
 
   if [[ -e ${SRCDIR}/tsconfig-upgrade.json ]]; then
     echo "======      COMPILING: ${TSC} -p ${SRCDIR}/tsconfig-upgrade.json        ====="
@@ -214,8 +222,12 @@ do
         $UGLIFYJS -c --screw-ie8 --comments -o ${UMD_UPGRADE_ES5_MIN_PATH} ${UMD_UPGRADE_ES5_PATH}
       fi
     ) 2>&1 | grep -v "as external dependency"
+
+    if [[ -n "${EXPERIMENTAL_ES2015_DISTRO}" ]]; then
+      cp -prv ${DESTDIR}/bundles ${ES2015_DESTDIR}
+    fi
   fi
-  
+
   (
     echo "======      VERSION: Updating version references"
     cd ${DESTDIR}

scripts/publish/publish-build-artifacts.sh

@@ -68,7 +68,11 @@ function publishRepo {
 
 # Publish all individual packages from packages-dist.
 function publishPackages {
-  for dir in dist/packages-dist/*/ dist/tools/@angular/tsc-wrapped
+  PKGS_DIST=dist/packages-dist
+  if [[ -n "${EXPERIMENTAL_ES2015_DISTRO}" ]]; then
+    PKGS_DIST=dist/packages-dist-es2015
+  fi
+  for dir in $PKGS_DIST/*/ dist/tools/@angular/tsc-wrapped
   do
     COMPONENT="$(basename ${dir})"