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Is @emnapi/wasi-threads ESM-only? Can you require() it?

WASI threads proposal implementation in JavaScript

Last verified Sep 9, 2026 against @emnapi/wasi-threads@2.1.0. JSON

ESM-only ESM-only since 2.0.0 — last CommonJS version is 1.2.3

@emnapi/wasi-threads dropped its CommonJS build in 2.0.0 (June 2026). The last version you can require() on every Node.js version, including 18 and older, is 1.2.3, published Jul 25, 2026.

On Node.js 20.19+, 22.12+ and every newer release, require("@emnapi/wasi-threads") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
2.1.0 (Sep 4, 2026)
Module format
ESM-only
Last CommonJS version
1.2.3
ESM-only since
2.0.0 (Jun 8, 2026)
TypeScript types
Bundled
Node engines
not declared
License
MIT

Does @emnapi/wasi-threads@2.1.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@emnapi/wasi-threads") from a CommonJS file and import "@emnapi/wasi-threads" from an ES module.

Runtimerequire("@emnapi/wasi-threads")import "@emnapi/wasi-threads"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 @emnapi/wasi-threads

ES modules (import)

import wasiThreads from "@emnapi/wasi-threads";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const wasiThreads = require("@emnapi/wasi-threads");

// Any Node.js version:
const wasiThreads = await import("@emnapi/wasi-threads");

// Or pin the last CommonJS release:
// npm install @emnapi/wasi-threads@1.2.3

Module format by version

Derived from the type, main and exports fields of every stable release on npm (13 versions; the newest 13 shown).

VersionsFormatFirst published
2.0.0 – 2.1.0ESM-onlyJun 8, 2026
1.0.0 – 1.2.3Dual (CommonJS + ESM)May 19, 2024

Frequently asked

Is @emnapi/wasi-threads ESM-only?

@emnapi/wasi-threads@2.1.0 is ESM-only. @emnapi/wasi-threads dropped its CommonJS build in 2.0.0 (June 2026). The last version you can require() on every Node.js version, including 18 and older, is 1.2.3, published Jul 25, 2026.

Which version of @emnapi/wasi-threads still supports CommonJS / require()?

1.2.3 is the last version of @emnapi/wasi-threads with a CommonJS build. Install it with "npm install @emnapi/wasi-threads@1.2.3". Every version from 2.0.0 on is ESM-only.

How do I use @emnapi/wasi-threads from a CommonJS file?

Use a dynamic import: const mod = await import("@emnapi/wasi-threads"). On Node.js 20.19+, 22.12+ and newer, a plain require("@emnapi/wasi-threads") also works for ESM packages that do not use top-level await. Alternatively pin @emnapi/wasi-threads@1.2.3.

Does @emnapi/wasi-threads work in Bun?

Yes. import "@emnapi/wasi-threads" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @emnapi/wasi-threads ship TypeScript types?

Yes. @emnapi/wasi-threads bundles its own type declarations; no @types package is needed.

Links

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