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

Base reporting library for istanbul

Last verified Sep 9, 2026 against istanbul-lib-report@3.0.1. JSON

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

istanbul-lib-report ships CommonJS only. require("istanbul-lib-report") works everywhere. import "istanbul-lib-report" 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
3.0.1 (Jul 25, 2023)
Module format
CommonJS
Last CommonJS version
3.0.1
TypeScript types
@types/istanbul-lib-report
Node engines
>=10
Weekly downloads
70.5M
License
BSD-3-Clause

Does istanbul-lib-report@3.0.1 actually load? Runtime test results

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

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

ES modules (import)

import istanbulLibReport from "istanbul-lib-report";

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 istanbulLibReport = require("istanbul-lib-report");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (18 versions; the newest 18 shown).

VersionsFormatFirst published
1.0.0 – 3.0.1CommonJSMar 27, 2017

Frequently asked

Is istanbul-lib-report ESM-only?

istanbul-lib-report@3.0.1 is a CommonJS package. istanbul-lib-report ships CommonJS only. require("istanbul-lib-report") works everywhere. import "istanbul-lib-report" 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-report with ES module syntax?

Yes. import istanbulLibReport from "istanbul-lib-report" 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-report work in Bun?

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

Does istanbul-lib-report ship TypeScript types?

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

Links

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