guybedford/es-module-shims

Health v2 · maintenance only

Adoption not part of the score

1729 stars · 99 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A browser polyfill library that adds modern ES modules features like import maps, JSON/CSS/Wasm modules, import defer, and TypeScript type stripping on top of native browser ESM support. It bypasses processing for browsers with native import maps support and uses a fast WASM-based lexer to rewrite module specifiers only for older browsers.

Use cases

• use import maps in browsers that don't support them natively
• polyfill JSON and CSS module imports with import assertions
• load WebAssembly modules via source phase imports
• use import defer syntax with a fallback for older browsers
• strip TypeScript types directly in the browser
• implement custom module resolution and fetch hooks
• hot reload ES modules with an import.meta.hot API

When to choose

• you rely on import maps or newer module features but must support older browsers
• you want a no-build, browser-native module workflow with polyfill fallbacks
• you need custom loader hooks for in-browser module resolution or transforms

When to avoid

• you only target browsers with full native import maps support
• you use a bundler-based build pipeline that doesn't need module polyfills

Facets

library · maturity active

developer-tools web-development frontend browser-extensions browser es-modules import-maps polyfill javascript-modules wasm-modules -modules css-modules typescript-stripping loader-hooks hot-reloading

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