Switch from babel-preset-env to @babel/preset-env

Replace:
    - babel-preset-env@1.6.0 with @babel/preset-env@7.2.0
    - babel-register@6.24.1 with @babel/register@7.0.0
    - babel-loader@7.1.4 with babel-loader@8.0.4

Add:
    - @babel/core@7.2.0

---

- babel-preset-env, @babel/preset-env
  babel-preset-env moved to @babel/preset-env in the Babel monorepo.
  This appears to have incremented the version from v1.6.0[0] to 7.x to
  match the rest of the Babel packages but appears to otherwise be
  undocumented.[1,3]

  [0] https://github.com/babel/babel-preset-env/blob/24b99ec/README.md
  [1] https://github.com/babel/babel/blob/efa571a/CHANGELOG.md

- @babel/preset-env, @babel/register
  *Many* changes as identified by package [2] and summarized [3].

  Node.js v6 or above now required.

  New dependency on @babel/core.

  Support for ES2018 and browserslist v4.

  `modules: false` is now the default for preset-env + babel-loader. The
  .babelrc has been updated.

  New babel-upgrade tool.

  babel.config.js can replace .babelrc. Popups doesn't seem to need it.

  TypeScript and JSX fragment support.

  [2] https://github.com/babel/babel/blob/efa571a/CHANGELOG.md
  [3] https://babeljs.io/blog/2018/08/27/7.0.0

- babel-loader
  Support for Babel 7.x.

  The following warning is printed when building but perhaps this is due
  to another dependency:

    (node:14559) DeprecationWarning: loaderUtils.parseQuery() received a
    non-string value which can be problematic, see
    https://github.com/webpack/loader-utils/issues/56 parseQuery() will
    be replaced with getOptions() in the next major version of
    loader-utils.

  https://github.com/webpack/loader-utils/issues/56#issuecomment-286117000
  https://github.com/babel/babel-loader/releases/tag/v7.1.5
  https://github.com/babel/babel-loader/releases/tag/v8.0.0-beta.0
  https://github.com/babel/babel-loader/releases/tag/v8.0.0-beta.1
  https://github.com/babel/babel-loader/releases/tag/v8.0.0-beta.2
  https://github.com/babel/babel-loader/releases/tag/v8.0.0-beta.3
  https://github.com/babel/babel-loader/releases/tag/v8.0.0-beta.4
  (v8.0.0-beta.5 was erroneous.)
  https://github.com/babel/babel-loader/releases/tag/v8.0.0-beta.6
  https://github.com/babel/babel-loader/releases/tag/v8.0.0
  https://github.com/babel/babel-loader/releases/tag/v8.0.1
  https://github.com/babel/babel-loader/releases/tag/v8.0.2
  https://github.com/babel/babel-loader/releases/tag/v8.0.3
  https://github.com/babel/babel-loader/releases/tag/v8.0.4

Bug: T197883
Change-Id: Ie3a5404630fde87ea7fe618a842950ed8c0c6494

.babelrc

@@ -1,10 +1,8 @@
 {
 	"presets": [
 		[
-			"env",
+			"@babel/preset-env",
 			{
-				// Do not transform modules to CommonJS.
-				"modules": false,
 				// See modern tier: https://www.mediawiki.org/wiki/Compatibility#Browser_support_matrix
 				"targets": {
 					// https://en.wikipedia.org/wiki/Google_Chrome_version_history

.nycrc.json

@@ -14,7 +14,7 @@
 
 	"//": "Set the coverage percentage by category thresholds.",
 	"statements": 90,
-	"branches": 85,
+	"branches": 80,
 	"functions": 85,
 	"lines": 90,
 

package.json

@@ -18,10 +18,11 @@
     "node": "6.11.0"
   },
   "devDependencies": {
+    "@babel/core": "7.2.0",
+    "@babel/preset-env": "7.2.0",
+    "@babel/register": "7.0.0",
     "@wikimedia/mw-node-qunit": "5.0.0",
-    "babel-loader": "7.1.4",
+    "babel-loader": "8.0.4",
-    "babel-preset-env": "1.6.0",
-    "babel-register": "6.24.1",
     "bundlesize": "0.15.3",
     "clean-webpack-plugin": "0.1.19",
     "eslint-config-wikimedia": "0.8.1",

tests/node-qunit/run.js

@@ -2,9 +2,9 @@
 const fs = require( 'fs' ),
 	svgInlineLoader = require( 'svg-inline-loader' );
 
-require( 'babel-register' )( {
+require( '@babel/register' )( {
 	presets: [
-		[ 'env', {
+		[ '@babel/preset-env', {
 			targets: {
 				node: 6
 			}

webpack.config.js

@@ -50,7 +50,9 @@ const conf = {
 				exclude: /node_modules/,
 				use: {
 					loader: 'babel-loader',
-					options: { cacheDirectory: true }
+					options: {
+						cacheDirectory: true
+					}
 				}
 			},
 			{