babel-preset: remove babel-plugin-transform-es2015-parameters (#1598)

babel/babel#4851 is closed

Author: christophehurpeau

packages/babel-preset-react-app/index.js

@@ -64,13 +64,6 @@ if (env === 'development' || env === 'test') {
 }
 
 if (env === 'test') {
-  plugins.push.apply(plugins, [
-    // We always include this plugin regardless of environment
-    // because of a Babel bug that breaks object rest/spread without it:
-    // https://github.com/babel/babel/issues/4851
-    require.resolve('babel-plugin-transform-es2015-parameters')
-  ]);
-
   module.exports = {
     presets: [
       // ES features necessary for user's Node version

packages/babel-preset-react-app/package.json

@@ -12,7 +12,6 @@
   ],
   "dependencies": {
     "babel-plugin-transform-class-properties": "6.22.0",
-    "babel-plugin-transform-es2015-parameters": "6.22.0",
     "babel-plugin-transform-object-rest-spread": "6.22.0",
     "babel-plugin-transform-react-constant-elements": "6.22.0",
     "babel-plugin-transform-react-jsx": "6.22.0",