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Informations about the package moodle-local_importmapshim

Import Map Shim (local_importmapshim)

A Moodle local plugin that injects the es-module-shims polyfill into every page, enabling import map support for browsers that do not natively support the feature.

Why this plugin exists

Moodle 5.2+ adopted ES module import maps as the foundation for its React-based UI. An import map is a JSON block in the HTML page that tells the browser how to resolve bare module specifiers like:

Moodle core added the import map mechanism but did not ship a polyfill for browsers that lack native support. Older browsers — and some versions of Firefox until recently — do not support import maps natively, causing the entire React-based UI to silently break for those users.

This plugin injects es-module-shims into every Moodle page before any import map or ES module is parsed. The shim works transparently: on browsers that already support import maps natively it steps aside and does nothing; on older browsers it intercepts module loading and emulates the feature.

Layer Who provides it
Import map definition + React modules Moodle core
Native import map support Modern browsers
Import map support on older browsers This plugin (via es-module-shims)

Requirements

Installation

Using Git

From your Moodle root directory, clone the plugin into the public/local/ subdirectory:

Then visit Site administration > Notifications to complete the installation.

Manual

  1. Download the plugin archive.
  2. Extract it so the plugin folder is at <moodleroot>/public/local/importmapshim/.
  3. Log in as an administrator and visit Site administration > Notifications.

How it works

The plugin hooks into Moodle's before_standard_top_of_body_html_generation hook (priority 1000) to inject a <script> tag that loads the es-module-shims polyfill early in the page lifecycle — before any import map or ES module scripts are evaluated.

The polyfill is served by a dedicated PSR-7 route controller (/shims/{revision}) that applies appropriate HTTP cache headers:

Mode Behaviour
Development ($CFG->cachejs = false) Short-lived headers, no ETag, 2-second expiry
Production Cache-Control: public, max-age=31536000, immutable with ETag and 304 support

Updating the bundled polyfill

The es-module-shims library can be updated by running the helper script:

For example:

This downloads the specified release, updates js/es-module-shims.js, and updates the version metadata in thirdpartylibs.xml.

License

This plugin is licensed under the GNU General Public License v3 or later.

All versions of moodle-local_importmapshim with dependencies

PHP Build Version
Package Version
Requires php Version >=8.1
moodle/moodle Version ^5.2
moodle/composer-installer Version *
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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