@sigmacomputing/babel-plugin-lodash

A simple transform to cherry-pick Lodash modules so you don’t have to.

Combine with lodash-webpack-plugin for even smaller cherry-picked builds!

@sigmacomputing/babel-plugin-lodash is forked from babel-plugin-lodash which has since been abandoned.

Install

NPM

$ npm install --save lodash
$ npm install --save-dev babel-plugin-lodash @babel/cli @babel/preset-env

Yarn

$ yarn add lodash
$ yarn add @sigmacomputing/babel-plugin-lodash @babel/cli @babel/preset-env -D

Example

Transforms

import _ from 'lodash';
import { add } from 'lodash/fp';

const addOne = add(1);
_.map([1, 2, 3], addOne);

roughly to

import _add from 'lodash/fp/add';
import _map from 'lodash/map';

const addOne = _add(1);
_map([1, 2, 3], addOne);

Usage

.babelrc

{
  "plugins": ["@sigmacomputing/babel-plugin-lodash"],
  "presets": [["@babel/env", { "targets": { "node": 6 } }]]
}

Set plugin options using an array of [pluginName, optionsObject].

{
  "plugins": [
    [
      "@sigmacomputing/babel-plugin-lodash",
      { "id": "lodash-compat", "cwd": "some/path" }
    ]
  ],
  "presets": [["@babel/env", { "targets": { "node": 6 } }]]
}

The options.id can be an array of ids.

{
  "plugins": [
    ["@sigmacomputing/babel-plugin-lodash", { "id": ["async", "lodash-bound"] }]
  ],
  "presets": [["@babel/env", { "targets": { "node": 6 } }]]
}

Babel CLI

$ babel --plugins @sigmacomputing/babel-plugin-lodash --presets @babel/es2015 script.js

Babel API

require('babel-core').transform('code', {
  plugins: ['@sigmacomputing/babel-plugin-lodash'],
  presets: [['@babel/env', { targets: { node: 6 } }]],
});

webpack.config.js

'module': {
  'loaders': [{
    'loader': 'babel-loader',
    'test': /\.js$/,
    'exclude': /node_modules/,
    'query': {
      'plugins': ['@sigmacomputing/babel-plugin-lodash'],
      'presets': [['@babel/env', { 'targets': { 'node': 6 } }]]
    }
  }]
}

FAQ

Can this plugin produce ES2015 imports rather than CommonJS imports?

This plugin produces ES2015 imports by default. The @babel/plugin-transform-modules-commonjs plugin, which is included in the @babel/preset-es2015 preset, transforms ES2015 import statements to CommonJS. Omit it from your preset to preserve ES2015 style imports.

Limitations

• You must use ES2015 imports to load Lodash
• Babel < 6 & Node.js < 4 aren’t supported
• Chain sequences aren’t supported. See this blog post for alternatives.
• Modularized method packages aren’t supported