Upgrade to Babel 7 (#6942)

Babel 7 moved to a new configuration format, and they've scoped all of
their packages under `@babel/`. This brings MetaMask in-line with
dependencies we use that _already_ use Babel 7, and it eliminates a
few unfortunate edge cases that can prevent dependencies from being
correctly transpiled.

.babelrc

@@ -1,21 +0,0 @@
-{
-  "presets": [
-    [
-      "env",
-      {
-        "targets": {
-          "browsers": [
-            "chrome >= 58",
-            "firefox >= 60"
-          ]
-        }
-      }
-    ],
-    "react"
-  ],
-  "plugins": [
-    "transform-runtime",
-    "transform-class-properties",
-    "transform-object-rest-spread"
-  ]
-}

babel.config.js

@@ -0,0 +1,24 @@
+module.exports = function (api) {
+  api.cache(false)
+  return {
+    presets: [
+      [
+        '@babel/preset-env',
+        {
+          targets: {
+            browsers: [
+              'chrome >= 58',
+              'firefox >= 60',
+            ],
+          },
+        },
+      ],
+      '@babel/preset-react',
+    ],
+    plugins: [
+      '@babel/plugin-transform-runtime',
+      '@babel/plugin-proposal-class-properties',
+      '@babel/plugin-proposal-object-rest-spread',
+    ],
+  }
+}

package.json

@@ -46,13 +46,13 @@
     "rollback": "./development/rollback.sh"
   },
   "dependencies": {
+    "@babel/runtime": "^7.5.5",
     "@material-ui/core": "1.0.0",
     "@sentry/browser": "^4.1.1",
     "@zxing/library": "^0.8.0",
     "abi-decoder": "^1.2.0",
     "asmcrypto.js": "^2.3.2",
     "await-semaphore": "^0.1.1",
-    "babel-runtime": "^6.23.0",
     "bignumber.js": "^4.1.0",
     "bip39": "^2.2.0",
     "bluebird": "^3.5.0",
@@ -166,21 +166,21 @@
     "xtend": "^4.0.1"
   },
   "devDependencies": {
+    "@babel/core": "^7.5.5",
+    "@babel/plugin-proposal-class-properties": "^7.5.5",
+    "@babel/plugin-proposal-object-rest-spread": "^7.5.5",
+    "@babel/plugin-transform-runtime": "^7.5.5",
+    "@babel/preset-env": "^7.5.5",
+    "@babel/preset-react": "^7.0.0",
+    "@babel/register": "^7.5.5",
     "@sentry/cli": "^1.30.3",
     "@storybook/addon-info": "^5.1.1",
     "@storybook/addon-knobs": "^3.4.2",
     "@storybook/react": "^5.1.1",
     "abortcontroller-polyfill": "^1.3.0",
     "addons-linter": "^1.10.0",
-    "babel-core": "^6.26.3",
+    "babel-eslint": "^10.0.2",
-    "babel-eslint": "^8.0.0",
+    "babelify": "^10.0.0",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-plugin-transform-object-rest-spread": "^6.22.0",
-    "babel-plugin-transform-runtime": "^6.23.0",
-    "babel-preset-env": "^1.7.0",
-    "babel-preset-react": "^6.24.1",
-    "babel-register": "^6.7.2",
-    "babelify": "^8.0.0",
     "brfs": "^1.6.1",
     "browserify": "^16.2.3",
     "chai": "^4.1.0",

test/setup.js

@@ -1,5 +1,5 @@
-require('babel-register')({
+require('@babel/register')({
-  ignore: name => name.includes('node_modules') && !name.includes('obs-store'),
+  ignore: [name => name.includes('node_modules') && !name.includes('obs-store')],
 })
 
 require('./helper')