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Is @jridgewell/sourcemap-codec ESM-only? Can you require() it?

Encode/decode sourcemap mappings

Last verified Sep 9, 2026 against @jridgewell/sourcemap-codec@1.6.0. Markdown · JSON

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

@jridgewell/sourcemap-codec publishes both a CommonJS entry and a native ESM entry (ESM added in 1.4.9). require("@jridgewell/sourcemap-codec") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@jridgewell/sourcemap-codec" works alongside it.

What to do

  1. Nothing to change. require("@jridgewell/sourcemap-codec") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as sourcemapCodec from "@jridgewell/sourcemap-codec" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
1.6.0 (Aug 28, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
1.6.0
Native ESM since
1.4.9
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
191.3M
License
MIT

Does @jridgewell/sourcemap-codec@1.6.0 actually load? Runtime test results

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

Runtimerequire("@jridgewell/sourcemap-codec")import "@jridgewell/sourcemap-codec"
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/sourcemap-codec

ES modules (import)

import * as sourcemapCodec from "@jridgewell/sourcemap-codec";

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

CommonJS (require)

const sourcemapCodec = require("@jridgewell/sourcemap-codec");

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 (14 versions; the newest 14 shown).

VersionsFormatFirst published
1.4.9 – 1.6.0Dual (CommonJS + ESM)Feb 5, 2022

Frequently asked

Is @jridgewell/sourcemap-codec ESM-only?

@jridgewell/sourcemap-codec@1.6.0 ships CommonJS and ESM builds. @jridgewell/sourcemap-codec publishes both a CommonJS entry and a native ESM entry (ESM added in 1.4.9). require("@jridgewell/sourcemap-codec") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@jridgewell/sourcemap-codec" works alongside it.

Can I require @jridgewell/sourcemap-codec?

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

Does @jridgewell/sourcemap-codec work in Bun?

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

Does @jridgewell/sourcemap-codec ship TypeScript types?

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

Links

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