canirequire › Dual (CommonJS + ESM) › web-streams-polyfill
Is web-streams-polyfill ESM-only? Can you require() it?
Web Streams, based on the WHATWG spec reference implementation
Last verified Sep 9, 2026 against web-streams-polyfill@4.3.0. JSON
Dual (CommonJS + ESM) Dual package — both require() and import work
web-streams-polyfill publishes both a CommonJS entry and a native ESM entry (ESM added in 4.0.0). require("web-streams-polyfill") and import "web-streams-polyfill" both work on every supported Node.js version and in Bun.
Does web-streams-polyfill@4.3.0 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("web-streams-polyfill") from a CommonJS file and import "web-streams-polyfill" from an ES module.
| Runtime | require("web-streams-polyfill") | import "web-streams-polyfill" |
|---|---|---|
| Node.js 18 | ✓ works | ✓ works |
| Node.js 20 | ✓ works | ✓ works |
| Node.js 22 | ✓ works | ✓ works |
| Node.js 24 | ✓ works | ✓ works |
| Node.js 26 | ✓ works | ✓ works |
| Bun 1.4 | ✓ works | ✓ works |
How to import web-streams-polyfill
ES modules (import)
import webStreamsPolyfill from "web-streams-polyfill";CommonJS (require)
const webStreamsPolyfill = require("web-streams-polyfill");Module format by version
Derived from the type, main and exports fields of every stable release on npm (35 versions; the newest 35 shown).
| Versions | Format | First published |
|---|---|---|
| 4.0.0 – 4.3.0 | Dual (CommonJS + ESM) | Feb 28, 2024 |
| 1.0.0 – 3.3.3 | CommonJS | Mar 2, 2016 |
Frequently asked
Is web-streams-polyfill ESM-only?
web-streams-polyfill@4.3.0 ships CommonJS and ESM builds. web-streams-polyfill publishes both a CommonJS entry and a native ESM entry (ESM added in 4.0.0). require("web-streams-polyfill") and import "web-streams-polyfill" both work on every supported Node.js version and in Bun.
Can I require web-streams-polyfill?
Yes. web-streams-polyfill ships a CommonJS entry, so require("web-streams-polyfill") works on every Node.js version, alongside the native ESM entry for import.
Does web-streams-polyfill work in Bun?
Yes. import "web-streams-polyfill" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does web-streams-polyfill ship TypeScript types?
Yes. web-streams-polyfill bundles its own type declarations; no @types package is needed.
Links
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