@ff0000-ad-tech/rollup-plugin-commonjs
v8.4.2
Published
Convert CommonJS modules to ES2015
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rollup-plugin-commonjs
Convert CommonJS modules to ES6, so they can be included in a Rollup bundle
Installation
npm install --save-dev rollup-plugin-commonjs
Usage
Typically, you would use this plugin alongside rollup-plugin-node-resolve, so that you could bundle your CommonJS dependencies in node_modules
.
// rollup.config.js
import commonjs from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve';
export default {
input: 'main.js',
output: {
file: 'bundle.js',
format: 'iife'
},
plugins: [
nodeResolve({
jsnext: true,
main: true
}),
commonjs({
// non-CommonJS modules will be ignored, but you can also
// specifically include/exclude files
include: 'node_modules/**', // Default: undefined
exclude: [ 'node_modules/foo/**', 'node_modules/bar/**' ], // Default: undefined
// these values can also be regular expressions
// include: /node_modules/
// search for files other than .js files (must already
// be transpiled by a previous plugin!)
extensions: [ '.js', '.coffee' ], // Default: [ '.js' ]
// if true then uses of `global` won't be dealt with by this plugin
ignoreGlobal: false, // Default: false
// if false then skip sourceMap generation for CommonJS modules
sourceMap: false, // Default: true
// explicitly specify unresolvable named exports
// (see below for more details)
namedExports: { './module.js': ['foo', 'bar' ] }, // Default: undefined
// sometimes you have to leave require statements
// unconverted. Pass an array containing the IDs
// or a `id => boolean` function. Only use this
// option if you know what you're doing!
ignore: [ 'conditional-runtime-dependency' ]
})
]
};
Custom named exports
This plugin will attempt to create named exports, where appropriate, so you can do this...
// importer.js
import { named } from './exporter.js';
// exporter.js
module.exports = { named: 42 }; // or `exports.named = 42;`
...but that's not always possible:
// importer.js
import { named } from 'my-lib';
// my-lib.js
var myLib = exports;
myLib.named = 'you can\'t see me';
In those cases, you can specify custom named exports:
commonjs({
namedExports: {
// left-hand side can be an absolute path, a path
// relative to the current directory, or the name
// of a module in node_modules
'node_modules/my-lib/index.js': [ 'named' ]
}
})
Strict mode
ES modules are always parsed in strict mode. That means that certain non-strict constructs (like octal literals) will be treated as syntax errors when Rollup parses modules that use them. Some older CommonJS modules depend on those constructs, and if you depend on them your bundle will blow up. There's basically nothing we can do about that.
Luckily, there is absolutely no good reason not to use strict mode for everything — so the solution to this problem is to lobby the authors of those modules to update them.
License
MIT