README.md

rollup-plugin-external-globals

Transform external imports into global variables like Rollup's output.globals option. See rollup/rollup#2374

Installation

npm install -D rollup-plugin-external-globals

Usage

import externalGlobals from "rollup-plugin-external-globals";

export default {
  input: ["entry.js"],
  output: {
    dir: "dist",
    format: "es"
  },
  plugins: [
    externalGlobals({
      jquery: "$"
    })
  ]
};

The above config transforms

import jq from "jquery";

console.log(jq(".test"));

into

console.log($(".test"));

It also transforms dynamic import:

import("jquery")
  .then($ => {
    $ = $.default || $;
    console.log($(".test"));
  });

// transformed
Promise.resolve($)
  .then($ => {
    $ = $.default || $;
    console.log($(".test"));
  });

Note: when using dynamic import, you should notice that in ES module, the resolved object is aways a module namespace, but the global variable might be not.

Note: this plugin only works with import/export syntax. If you are using a module loader transformer e.g. rollup-plugin-commonjs, you have to put this plugin after the transformer plugin.

API

This module exports a single function.

createPlugin

const plugin = createPlugin(
  globals: Object | Function,
  {
    include?: ReadonlyArray<string | RegExp> | string | RegExp | null,
    exclude?: ReadonlyArray<string | RegExp> | string | RegExp | null,
    dynamicWrapper?: Function,
    constBindings?: Boolean
  } = {}
);

globals is a moduleId/variableName map. For example, to map jquery module to $:

const globals = {
  jquery: "$"
}

or provide a function that takes the moduleId and returns the variableName.

const globals = (id) => {
  if (id === "jquery") {
    return "$";
  }
}

include is a valid picomatch glob pattern, or array of patterns. If defined, only matched files would be transformed.

exclude is a valid picomatch glob pattern, or array of patterns. Matched files would not be transformed.

dynamicWrapper is used to specify dynamic imports. Below is the default.

const dynamicWrapper = (id) => {
  return `Promise.resolve(${id})`;
}

Virtual modules are always transformed.

constBindings is a boolean. If true, the plugin will use const instead of var to declare the variable. This usually happens when you try to re-export the global variable. Default is false.

Changelog

• 0.13.0 (Nov 20, 2024)

  • Change: update include/exclude signature

• 0.12.1 (Nov 15, 2024)

  • Fix: there is no debug hook in rollup 2.

• 0.12.0 (Aug 11, 2024)

  • Change: throw on export all declaration.
  • Change: define variables with var, add constBindings option to use const instead.
  • Change: resolve identifiers as external.

• 0.11.0 (Jun 27, 2024)

  • Fix: local variable conflict in export declaration.
  • Change: don't throw on parse error.

• 0.10.0 (Apr 5, 2024)

  • Add: exports field in package.json to export typescript declaration.

• 0.9.2 (Jan 21, 2024)

  • Fix: support rollup 4.9.6.

• 0.9.1 (Nov 19, 2023)

  • Fix: type declaration.

• 0.9.0 (Oct 28, 2023)

  • Breaking: bump to rollup@4.

• 0.8.0 (May 12, 2023)

  • Bump dependencies. Update to magic-string@0.30

• 0.7.2 (mar 9, 2023)

  • Add: typescript declaration.

• 0.7.0 (Nov 21, 2022)

  • Breaking: bump to rollup@3.

• 0.6.1 (Oct 21, 2020)

  • Fix: add an extra assignment when exporting globals.

• 0.6.0 (Aug 14, 2020)

  • Breaking: bump to rollup@2.

• 0.5.0 (Dec 8, 2019)

  • Add: dynamicWrapper option.
  • Add: now globals can be a function.
  • Bump dependencies/peer dependencies.

• 0.4.0 (Sep 24, 2019)

  • Add: transform dynamic imports i.e. import("foo") => Promise.resolve(FOO).

• 0.3.1 (Jun 6, 2019)

  • Fix: all export-from statements are incorrectly transformed.
  • Bump dependencies.

• 0.3.0 (Mar 25, 2019)

  • Fix: temporary variable name conflicts.
  • Breaking: transform virtual modules. Now the plugin transforms proxy modules generated by commonjs plugin.
  • Bump dependencies.

• 0.2.1 (Oct 2, 2018)

  • Fix: don't skip export statement.

• 0.2.0 (Sep 12, 2018)

  • Change: use transform hook.
  • Add: rewrite conflicted variable names.
  • Add: handle export from.

• 0.1.0 (Aug 5, 2018)

  • Initial release.