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@magic-works/webextension-systemjs

v0.0.4

Published

A SystemJS loader for Web Extension content script

Downloads

2

Readme

Use SystemJS in content script of Web Extension

Motivation

To use ES Module in Web Extension.

But it is blocked by Firefox Bug 1536094: Dynamic module import doesn't work in webextension content scripts

Perquisite

If not running on the Firefox, you have to include a polyfill: webextension-polyfill.

  • Build all your code into ESModule format and SystemJS format.

Usage

  1. Install @magic-works/webextension-systemjs
  2. Load @magic-works/webextension-systemjs/background-script.js in the background script
  3. Load @magic-works/webextension-systemjs/content-script.js before your code.
  4. Transpile all your code into SystemJS format.
  5. Run you content script by
// Chrome support native ES Module in content script
import(browser.runtime.getURL("./es/content-script.js")).catch(() => {
    // Firefox fallback to SystemJS
    System.import("./system/content-script.js")
})

An example repo

https://github.com/Jack-Works/web-extension-esmodule-test/tree/master/mixed