canirequire › CommonJS › tsd
Is tsd ESM-only? Can you require() it?
Check TypeScript type definitions
Last verified Sep 9, 2026 against tsd@0.33.0. JSON
CommonJS CommonJS — require() works on every Node.js version
tsd ships CommonJS only. require("tsd") works everywhere. import "tsd" 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 tsd@0.33.0 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("tsd") from a CommonJS file and import "tsd" from an ES module.
| Runtime | require("tsd") | import "tsd" |
|---|---|---|
| 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 tsd
ES modules (import)
import tsd from "tsd";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 tsd = require("tsd");Module format by version
Derived from the type, main and exports fields of every stable release on npm (65 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 0.2.2 – 0.33.0 | CommonJS | Nov 8, 2012 |
Frequently asked
Is tsd ESM-only?
tsd@0.33.0 is a CommonJS package. tsd ships CommonJS only. require("tsd") works everywhere. import "tsd" 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 tsd with ES module syntax?
Yes. import tsd from "tsd" 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 tsd work in Bun?
Yes. import "tsd" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does tsd ship TypeScript types?
Yes. tsd bundles its own type declarations; no @types package is needed.
Links
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