Merge branch 'master' into fix/textarea/warning-passive

karma.conf.js

@@ -66,8 +66,11 @@ const istanbulInstrumenterLoader = {
 module.exports = function(config) {
   config.set({
     basePath: '',
+    // Refer https://github.com/karma-runner/karma-mocha
     frameworks: ['mocha'],
     files: [
+      // Refer https://github.com/babel/karma-babel-preprocessor
+      'node_modules/@babel/polyfill/dist/polyfill.js',
       'test/unit/index.js',
     ],
     preprocessors: {
@@ -112,6 +115,7 @@ module.exports = function(config) {
       },
     },
 
+    // Refer https://github.com/webpack-contrib/karma-webpack
     webpack: Object.assign({}, webpackConfig, {
       module: Object.assign({}, webpackConfig.module, {
         // Cover source files when not debugging tests. Otherwise, omit coverage instrumenting to get

package.json

@@ -41,7 +41,9 @@
     "test:site": "npm run clean:site && ./scripts/site-generator-test.sh"
   },
   "devDependencies": {
+    "@babel/core": "^7.4.5",
     "@babel/parser": "^7.2.3",
+    "@babel/polyfill": "^7.4.4",
     "@babel/traverse": "^7.3.4",
     "@babel/types": "^7.3.4",
     "@google-cloud/datastore": "^3.0.1",
@@ -97,6 +99,7 @@
     "jsdom": "^13.1.0",
     "json-stable-stringify": "^1.0.1",
     "karma": "^4.0.0",
+    "karma-babel-preprocessor": "^8.0.0",
     "karma-chrome-launcher": "^2.0.0",
     "karma-coverage-istanbul-reporter": "^2.0.4",
     "karma-firefox-launcher": "^1.0.0",