canirequire › CommonJS › rewire
Is rewire ESM-only? Can you require() it?
Easy dependency injection for node.js unit testing
Last verified Sep 9, 2026 against rewire@9.0.1. JSON
CommonJS CommonJS — require() works on every Node.js version
rewire ships CommonJS only. require("rewire") works everywhere. import "rewire" 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.
Does rewire@9.0.1 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("rewire") from a CommonJS file and import "rewire" from an ES module.
| Runtime | require("rewire") | import "rewire" |
|---|---|---|
| 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 rewire
ES modules (import)
import rewire from "rewire";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 rewire = require("rewire");Module format by version
Derived from the type, main and exports fields of every stable release on npm (48 versions; the newest 48 shown).
| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 9.0.1 | CommonJS | Jun 4, 2012 |
Frequently asked
Is rewire ESM-only?
rewire@9.0.1 is a CommonJS package. rewire ships CommonJS only. require("rewire") works everywhere. import "rewire" 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 rewire with ES module syntax?
Yes. import rewire from "rewire" 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 rewire work in Bun?
Yes. import "rewire" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does rewire ship TypeScript types?
Not bundled. Install the community types with "npm install -D @types/rewire".
Links
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