canirequire › CommonJS › co
Is co ESM-only? Can you require() it?
generator async control flow goodness
Last verified Sep 9, 2026 against co@4.6.0. JSON
CommonJS CommonJS — require() works on every Node.js version
co ships CommonJS only. require("co") works everywhere. import "co" 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 co@4.6.0 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("co") from a CommonJS file and import "co" from an ES module.
| Runtime | require("co") | import "co" |
|---|---|---|
| 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 co
ES modules (import)
import co from "co";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 co = require("co");Module format by version
Derived from the type, main and exports fields of every stable release on npm (34 versions; the newest 34 shown).
| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 4.6.0 | CommonJS | Jun 6, 2013 |
Frequently asked
Is co ESM-only?
co@4.6.0 is a CommonJS package. co ships CommonJS only. require("co") works everywhere. import "co" 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 co with ES module syntax?
Yes. import co from "co" 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 co work in Bun?
Yes. import "co" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does co ship TypeScript types?
Not bundled. Install the community types with "npm install -D @types/co".
Links
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