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Is @jridgewell/gen-mapping ESM-only? Can you require() it?

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Last verified Sep 9, 2026 against @jridgewell/gen-mapping@0.3.13. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

@jridgewell/gen-mapping publishes both a CommonJS entry and a native ESM entry (ESM added in 0.1.0). require("@jridgewell/gen-mapping") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@jridgewell/gen-mapping" works alongside it.

What to do

  1. Nothing to change. require("@jridgewell/gen-mapping") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as genMapping from "@jridgewell/gen-mapping" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
0.3.13 (Aug 12, 2025)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
0.3.13
Native ESM since
0.1.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
163.4M
License
MIT

Does @jridgewell/gen-mapping@0.3.13 actually load? Runtime test results

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

Runtimerequire("@jridgewell/gen-mapping")import "@jridgewell/gen-mapping"
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 1.4.0✓ works✓ works

How to import @jridgewell/gen-mapping

ES modules (import)

import * as genMapping from "@jridgewell/gen-mapping";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const genMapping = require("@jridgewell/gen-mapping");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (17 versions; the newest 17 shown).

VersionsFormatFirst published
0.1.0 – 0.3.13Dual (CommonJS + ESM)Apr 27, 2022

Frequently asked

Is @jridgewell/gen-mapping ESM-only?

@jridgewell/gen-mapping@0.3.13 ships CommonJS and ESM builds. @jridgewell/gen-mapping publishes both a CommonJS entry and a native ESM entry (ESM added in 0.1.0). require("@jridgewell/gen-mapping") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@jridgewell/gen-mapping" works alongside it.

Can I require @jridgewell/gen-mapping?

Yes. @jridgewell/gen-mapping ships a CommonJS entry alongside the native ESM entry. require("@jridgewell/gen-mapping") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does @jridgewell/gen-mapping work in Bun?

Yes. import "@jridgewell/gen-mapping" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does @jridgewell/gen-mapping ship TypeScript types?

Yes. @jridgewell/gen-mapping bundles its own type declarations; no @types package is needed.

Links

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