message: build: fix and re-enable elements tests on saucelabs
  The `elements` tests were disabled on Saucelabs, because they were failing on IE10. The problem was that we were loading an es2015 file from npm directly, causing a syntax error. These changes transpile the file to es5.
  PR Close
diff: load("//tools:defaults.bzl", "karma_web_test_suite", "ts_library")
  load("//tools/circular_dependency_test:index.bzl", "circular_dependency_test")
  +load("//tools:utils.bzl", "transpile_js_to_es5")
  circular_dependency_test(
  name = "circular_deps_test",
  @@ -25,13 +26,20 @@ ts_library(
  ],
  )
  +# This file is shipped as es2015 to npm. We have to transpile
  +# it to es5 in order to run the tests against older browsers.
  +transpile_js_to_es5(
  + name = "custom_elements_native_shim",
  + js_file = "@npm//:node_modules/@webcomponents/custom-elements/src/native-shim.js",
  +)
  +
  filegroup(
  name = "elements_test_bootstrap_scripts",
  testonly = True,
  # do not sort
  srcs = [
  "@npm//:node_modules/core-js/client/core.js",
  - "@npm//:node_modules/@webcomponents/custom-elements/src/native-shim.js",
  + ":custom_elements_native_shim",
  "@npm//:node_modules/reflect-metadata/Reflect.js",
  "//packages/zone.js/dist:zone.js",
  "//packages/zone.js/dist:zone-testing.js",
  @@ -43,17 +51,6 @@ karma_web_test_suite(
  bootstrap = [
  ":elements_test_bootstrap_scripts",
  ],
  - tags = [
  - # disabled on 2020-04-14 due to failure on saucelabs monitor job
  - # https://app.circleci.com/pipelines/github/angular/angular/13320/workflows/9ca3527a-d448-4a64-880a-fb4de9d1fece/jobs/680645
  - # ```
  - # IE 10.0.0 (Windows 8.0.0) ERROR
  - # An error was thrown in afterAll
  - # Syntax error
  - # ```
  - "fixme-saucelabs-ve",
  - "fixme-saucelabs-ivy",
  - ],
  deps = [
  ":test_lib",
  ],
  