How to upgrade to babel 7

Babel changed the name of the module babel-core to @babel/core. Just run npm install @babel/core. This will install the latest version of Babel core.

Most of the packages in Babel has been renamed to follow the pattern @babel/PACKAGE_NAME. So if you want to upgrade, change the package names to follow the pattern and run npm install.

To upgrade to Babel 7 you can use this migration guide.

Use babel-upgrade

Tested on [email protected], [email protected] and [email protected]

You can use following script. (npx on node 5+ only)

npx babel-upgrade --write

The --write flag writes the updates to your package.json and .babelrc.

You will end up with following modifications to package.json:

"devDependencies": {
    "@babel/core": "^7.4.0",
    "@babel/plugin-proposal-class-properties": "^7.0.0",
    "@babel/plugin-proposal-json-strings": "^7.0.0",
    "@babel/plugin-proposal-private-methods": "^7.4.0",
    "@babel/plugin-syntax-dynamic-import": "^7.0.0",
    "@babel/plugin-syntax-import-meta": "^7.0.0"
}

.babelrc

{
  "plugins": [
    "@babel/plugin-syntax-dynamic-import",
    "@babel/plugin-syntax-import-meta",
    [
      "@babel/plugin-proposal-class-properties"
    ],
    "@babel/plugin-proposal-json-strings",
    [
      "@babel/plugin-proposal-private-methods"
    ]
  ]
}

Out of the above plugins you need @babel/plugin-proposal-class-properties @babel/plugin-proposal-private-methods to make private properties work correctly if you choose to implement them.

If you are using eslint, dont forget to set your parser as babel-eslint like so in your .eslintrc file:

{
    "parser": "babel-eslint"
}