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Is @istanbuljs/schema ESM-only? Can you require() it?

Schemas describing various structures used by nyc and istanbuljs

Last verified Sep 9, 2026 against @istanbuljs/schema@0.1.6. Markdown · JSON

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

@istanbuljs/schema ships CommonJS only. require("@istanbuljs/schema") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8. import "@istanbuljs/schema" 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("@istanbuljs/schema") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8.
  2. From ES modules use the default import: import schema from "@istanbuljs/schema"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for @istanbuljs/schema; declare the module yourself if you need them.
Latest
0.1.6 (Apr 13, 2026)
Module format
CommonJS
Last CommonJS version
0.1.6
TypeScript types
None
Node engines
>=8
Weekly downloads
44.0M
License
MIT

Does @istanbuljs/schema@0.1.6 actually load? Runtime test results

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

Runtimerequire("@istanbuljs/schema")import "@istanbuljs/schema"
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 @istanbuljs/schema

ES modules (import)

import schema from "@istanbuljs/schema";

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 schema = require("@istanbuljs/schema");

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 (6 versions; the newest 6 shown).

VersionsFormatFirst published
0.1.0 – 0.1.6CommonJSOct 5, 2019

Frequently asked

Is @istanbuljs/schema ESM-only?

@istanbuljs/schema@0.1.6 is a CommonJS package. @istanbuljs/schema ships CommonJS only. require("@istanbuljs/schema") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8. import "@istanbuljs/schema" 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 @istanbuljs/schema with ES module syntax?

Yes. import schema from "@istanbuljs/schema" 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 @istanbuljs/schema work in Bun?

Yes. import "@istanbuljs/schema" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does @istanbuljs/schema ship TypeScript types?

No. @istanbuljs/schema ships no type declarations and there is no @types package for it.

Links

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