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Is istanbul-instrumenter-loader ESM-only? Can you require() it?

Istanbul instrumenter loader for webpack

Last verified Sep 9, 2026 against istanbul-instrumenter-loader@3.0.1. Markdown · JSON

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

istanbul-instrumenter-loader ships CommonJS only. require("istanbul-instrumenter-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 4.8 < 5.0.0 || >= 5.10. import "istanbul-instrumenter-loader" 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.

What to do

  1. require("istanbul-instrumenter-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 4.8 < 5.0.0 || >= 5.10.
  2. From ES modules use the default import: import istanbulInstrumenterLoader from "istanbul-instrumenter-loader"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for istanbul-instrumenter-loader; declare the module yourself if you need them.
Latest
3.0.1 (Mar 28, 2018)
Module format
CommonJS
Last CommonJS version
3.0.1
TypeScript types
None
Node engines
>= 4.8 < 5.0.0 || >= 5.10
Weekly downloads
152K
License
MIT

Does istanbul-instrumenter-loader@3.0.1 actually load? Runtime test results

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

Runtimerequire("istanbul-instrumenter-loader")import "istanbul-instrumenter-loader"
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 istanbul-instrumenter-loader

ES modules (import)

import istanbulInstrumenterLoader from "istanbul-instrumenter-loader";

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 istanbulInstrumenterLoader = require("istanbul-instrumenter-loader");

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 (11 versions; the newest 11 shown).

VersionsFormatFirst published
0.1.0 – 3.0.1CommonJSSep 25, 2014

Frequently asked

Is istanbul-instrumenter-loader ESM-only?

istanbul-instrumenter-loader@3.0.1 is a CommonJS package. istanbul-instrumenter-loader ships CommonJS only. require("istanbul-instrumenter-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 4.8 < 5.0.0 || >= 5.10. import "istanbul-instrumenter-loader" 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-instrumenter-loader with ES module syntax?

Yes. import istanbulInstrumenterLoader from "istanbul-instrumenter-loader" 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-instrumenter-loader work in Bun?

Yes. import "istanbul-instrumenter-loader" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does istanbul-instrumenter-loader ship TypeScript types?

No. istanbul-instrumenter-loader ships no type declarations and there is no @types package for it.

Links

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