How to upgrade to babel 7

Question

I tried to upgrade Webpack and babel to 4, 7 respectively but couldn’t make it work. Also the official doc isn’t helping much with the upgrade

I am getting followin

Answer 1

Use babel-upgrade

Tested on node@10.15.3, npm@6.4.1 and babel@7.4.0

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"
}