# ModuleLoader/es-module-loader

Polyfill for the ES Module Loader

Repository: https://github.com/ModuleLoader/es-module-loader
Canonical: https://ross.abutalabs.com/products/es-module-loader
Language: JavaScript
License: MIT
License Family: permissive
Archived: true
Last push: 2018-07-15T12:57:18+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5219, "days_push": 2971, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2210, forks 183 (observed 2026-08-28T04:06:26.262121+00:00)

## What it is
A JavaScript polyfill implementing the WhatWG ES module loader API with low-level hooks for building custom module loaders. It supports the System.register and System.registerDynamic formats for exact ES module loading semantics, including CommonJS interop.

## Use cases
- load ES modules in browsers that lack native support
- build a custom ES module loader on a low-level loader API
- mix ES modules and CommonJS modules in one module graph
- run ES modules in Node with CommonJS interop
- polyfill the import and registry loader API

## When to choose
- you need to support ES module loading in legacy environments without native module support
- you are building a custom module loader and need low-level loader hooks
- you need System.register format loading with exact ES module linking semantics

## When to avoid
- your target environments natively support ES modules
- you need a maintained solution - the project has not released since 2018
- you want a modern bundler-based module workflow instead of a runtime loader

## Facets
- artifact type: library
- maturity: abandoned
- function: parser, developer-tools
- domain: web-development, frontend, developer-tools
- platform: browser
- tags: es-modules, module-loader, polyfill, system-register, whatwg-loader-spec, nodejs, javascript

## Member repositories
- ModuleLoader/es-module-loader (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:26.262121+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:46:06.514875+00:00, confidence not recorded.
  - readme: https://github.com/ModuleLoader/es-module-loader (fetched 2026-08-28T04:06:26.262121+00:00, sha 25b0330460dc)
  - registry_npm: https://registry.npmjs.org/es-module-loader (fetched 2026-08-29T10:26:42.751204+00:00, sha 6046c57ee7cd)
- Data as of 2026-08-30T08:39:29.467469+00:00.