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airbnb

Description

A babel preset for transforming your JavaScript for Airbnb

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babel-preset-airbnb

A babel preset for transforming your JavaScript for Airbnb.

Currently contains transforms for all stage 4 (ES2018) and stage 3 syntax that is permitted in the Airbnb Style Guide. Please note that if usage of a stage 3 proposal is not explicitly mentioned in the Airbnb Style Guide, then it will not be enabled here. Additionally, stage 4 syntax that is excluded is as follows: - generators:

regenerator-runtime
is too heavyweight for our use. -
async/await
:
regenerator-runtime
is too heavyweight for our use, and async-to-promises is not yet complete enough to be safely used. - async iterators: depends on both generators and
async function
s - lifted template literal restrictions: we do not use tagged template literals, nor implement custom DSLs, otherwise we would enable this.

Install

$ npm install --save-dev babel-preset-airbnb

Usage

Via
.babelrc
(Recommended)

.babelrc

{
  "presets": ["airbnb"]
}

Via CLI

$ babel script.js --presets airbnb

Via Node API

require('@babel/core').transform('code', {
  presets: ['airbnb']
});

Targeting Environments

This module uses @babel/preset-env to target specific environments.

Please refer to @babel/preset-env#targets for a list of available options.

For a list of browsers please see browserlist.

You may override our default list of targets by providing your own

targets
key.
{
  "presets": [["airbnb", {
    "targets": {
      "chrome": 50,
      "ie": 11,
      "firefox": 45
    }
  }]]
}

The following transpiles only for Node v6.

{
  "presets": [["airbnb", {
    "targets": {
      "node": 6
    }
  }]]
}

If you wish, you can also inherit our default list of browsers and extend them using

additionalTargets
.
{
  "presets": [["airbnb", {
    "additionalTargets": {
      "chrome": 42,
      "ie": 8
    }
  }]]
}

You may override our default debug option by providing your own

debug
key.
{
  "presets": [["airbnb", {
    "debug": true
  }]]
}

React Development Mode

When

process.env.NODE_ENV
is
'development'
, the
development
mode will be set for
@babel/preset-react
.

You may override our default development option by providing your own boolean

development
key.
{
  "presets": [["airbnb", {
    "development": false
  }]]
}

React PropTypes removal

This preset can be configured to remove propTypes using babel-plugin-transform-react-remove-prop-types with the following default options:

To enable this transformation with the default options, set the

removePropTypes
option to
true
:
{
  "presets": [["airbnb", {
    "removePropTypes": true
  }]]
}

The default options that will be used are:

{
  mode: 'wrap',
  additionalLibraries: ['airbnb-prop-types'],
  ignoreFilenames: ['node_modules'],
}

Default options can be overridden using the

removePropTypes
option. These options will be shallow-merged with the defaults:
{
  "presets": [["airbnb", {
    "removePropTypes": {
      "mode": "remove"
    }
  }]]
}

For example, if you are using this plugin in a deployable app, you might want to use the remove mode for your production build (and disable this transform entirely in development for optimal build speeds).

Classes loose mode

By default, this preset will compile classes in normal mode. This is safer, but comes with a bundle size and runtime overhead. To compile classes in loose mode, set the

looseClasses
option to
true
:
{
  "presets": [["airbnb", {
    "looseClasses": true,
  }]]
}

The risks of enabling loose classes are outlined in the Babel docs.

Specifying a babel runtime version

By default @babel/plugin-transform-runtime will assume the oldest version of the runtime to avoid importing helpers that don't exist which would fail at runtime. This can result in newer helpers being inlined into modules (ex. objectSpread2) which increases bundle size.

To avoid this you can configure the preset to use the same version of the runtime that's installed in your package.json.

ex. If package.json has

"@babel/runtime": "^7.5.5"
then you can use:
{
  "presets": [["airbnb", {
    "runtimeVersion": "7.5.5",
  }]]
}

Note that this will result in a runtime breakage if the version passed into the airbnb preset is newer than the version of the babel runtime actually being used at build time.

Disabling
plugin-transform-runtime

You can use the

transformRuntime
option to disable
@babel/plugin-transform-runtime
. Specifying
false
will disable the plugin. This option defaults to
true
.

Specifying module transforms

You can use the

modules
option to enable transformation of modules given to this preset:
{
  "presets": [["airbnb", {
    "modules": "auto"
  }]]
}

Both

true
and the option default
auto
will not transform modules if ES6 module syntax is already supported by the environment, or
"commonjs"
otherwise.
false
will not transform modules.

You can use the

runtimeHelpersUseESModules
option to prevent transformation of runtime helpers to CommonJS modules.
{
  "presets": [["airbnb", {
    "runtimeHelpersUseESModules": true
  }]]
}

true
will not transform runtime helpers to CommonJS modules.
false
will transform runtime helpers to CommonJS modules. The option defaults to
true
if
modules
is set to
false
, and
false
otherwise.

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