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Is istanbul-lib-instrument ESM-only? Can you require() it?

Core istanbul API for JS code coverage

Last verified Sep 9, 2026 against istanbul-lib-instrument@6.0.3. JSON

CommonJS CommonJS — require() works on every Node.js version

istanbul-lib-instrument ships CommonJS only. require("istanbul-lib-instrument") works everywhere. import "istanbul-lib-instrument" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Latest
6.0.3 (Jun 30, 2024)
Module format
CommonJS
Last CommonJS version
6.0.3
TypeScript types
@types/istanbul-lib-instrument
Node engines
>=10
Weekly downloads
59.2M
License
BSD-3-Clause

Does istanbul-lib-instrument@6.0.3 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("istanbul-lib-instrument") from a CommonJS file and import "istanbul-lib-instrument" from an ES module.

Runtimerequire("istanbul-lib-instrument")import "istanbul-lib-instrument"
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 istanbul-lib-instrument

ES modules (import)

import istanbulLibInstrument from "istanbul-lib-instrument";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const istanbulLibInstrument = require("istanbul-lib-instrument");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (58 versions; the newest 58 shown).

VersionsFormatFirst published
1.1.0 – 6.0.3CommonJSAug 11, 2016

Frequently asked

Is istanbul-lib-instrument ESM-only?

istanbul-lib-instrument@6.0.3 is a CommonJS package. istanbul-lib-instrument ships CommonJS only. require("istanbul-lib-instrument") works everywhere. import "istanbul-lib-instrument" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import istanbul-lib-instrument with ES module syntax?

Yes. import istanbulLibInstrument from "istanbul-lib-instrument" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does istanbul-lib-instrument work in Bun?

Yes. import "istanbul-lib-instrument" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does istanbul-lib-instrument ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/istanbul-lib-instrument".

Links

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