chore(babel): Upgrade to Babel 7 (#5498)

Use npx babel-upgrade --write --install to initiate the upgrade. Then update grunt and rollup.

Decreases minified, gzipped filesize by about 1KB. Decreases build times by a few minutes.

.babelrc

@@ -1,7 +1,10 @@
 {
   "presets": [
-    ["es2015", {
-      "loose": true
-    }]
+    [
+      "@babel/preset-env",
+      {
+        "loose": true
+      }
+    ]
   ]
 }

Gruntfile.js

@@ -1,4 +1,4 @@
-require('babel-register');
+require('@babel/register');
 
 // Need to `require` a separate Grunt file so we can use ES6 syntax via
 // Babel's require hook.

package.json

@@ -52,8 +52,8 @@
     "url": "https://github.com/videojs/video.js.git"
   },
   "dependencies": {
+    "@babel/runtime": "^7.0.0",
     "@videojs/http-streaming": "1.3.0",
-    "babel-runtime": "^6.9.2",
     "global": "4.3.2",
     "safe-json-parse": "4.0.0",
     "tsml": "1.0.1",
@@ -62,14 +62,15 @@
     "xhr": "2.4.0"
   },
   "devDependencies": {
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/node": "^7.0.0",
+    "@babel/plugin-transform-runtime": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "@babel/register": "^7.0.0",
     "aliasify": "^2.1.0",
     "autoprefixer": "^9.0.1",
-    "babel-cli": "^6.11.4",
-    "babel-plugin-external-helpers": "^6.22.0",
-    "babel-plugin-transform-runtime": "^6.9.0",
-    "babel-preset-es2015": "^6.14.0",
-    "babel-register": "^6.9.0",
-    "babelify": "^8.0.0",
+    "babelify": "^10.0.0",
     "bluebird": "^3.5.1",
     "browserify-derequire": "^0.9.4",
     "browserify-istanbul": "^2.0.0",
@@ -92,7 +93,7 @@
     "grunt-contrib-connect": "~2.0.0",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-cssmin": "~3.0.0",
-    "grunt-contrib-watch": "~1.1.0",
+    "grunt-contrib-watch": "^1.1.0",
     "grunt-coveralls": "^1.0.0",
     "grunt-karma": "^3.0.0",
     "grunt-sass": "^3.0.2",
@@ -137,7 +138,7 @@
     "replace": "^0.3.0",
     "rollup": "^0.66.2",
     "rollup-plugin-alias": "^1.4.0",
-    "rollup-plugin-babel": "^3.0.3",
+    "rollup-plugin-babel": "^4.0.1",
     "rollup-plugin-commonjs": "^9.1.0",
     "rollup-plugin-filesize": "^4.0.1",
     "rollup-plugin-ignore": "^1.0.3",

rollup.config.js

@@ -45,12 +45,11 @@ const primedBabel = babel({
   exclude: 'node_modules/**(!http-streaming)',
   compact: false,
   presets: [
-    ['es2015', {
+    ['@babel/preset-env', {
       loose: true,
       modules: false
     }]
-  ],
-  plugins: ['external-helpers']
+  ]
 });
 
 export default cliargs => [

test/karma.conf.js

@@ -40,7 +40,16 @@ module.exports = function(config) {
     browserify: {
       debug: true,
       plugin: ['proxyquireify/plugin'],
-      transform: ['babelify']
+      transform: [['babelify', {
+        "presets": [
+          [
+            "@babel/preset-env",
+            {
+              "loose": true
+            }
+          ]
+        ]
+      }]]
     },
 
     plugins: [