canirequire

canirequire › CommonJS › reflect-metadata

Is reflect-metadata ESM-only? Can you require() it?

Polyfill for Metadata Reflection API

Last verified Sep 9, 2026 against reflect-metadata@0.2.2. JSON

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

reflect-metadata ships CommonJS only. require("reflect-metadata") works everywhere. import "reflect-metadata" 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.

Latest
0.2.2 (Mar 29, 2024)
Module format
CommonJS
Last CommonJS version
0.2.2
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
28.5M
License
Apache-2.0

Does reflect-metadata@0.2.2 actually load? Runtime test results

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

Runtimerequire("reflect-metadata")import "reflect-metadata"
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 reflect-metadata

ES modules (import)

import reflectMetadata from "reflect-metadata";

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 reflectMetadata = require("reflect-metadata");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (19 versions; the newest 19 shown).

VersionsFormatFirst published
0.0.2 – 0.2.2CommonJSApr 14, 2015

Frequently asked

Is reflect-metadata ESM-only?

reflect-metadata@0.2.2 is a CommonJS package. reflect-metadata ships CommonJS only. require("reflect-metadata") works everywhere. import "reflect-metadata" 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 reflect-metadata with ES module syntax?

Yes. import reflectMetadata from "reflect-metadata" 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 reflect-metadata work in Bun?

Yes. import "reflect-metadata" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does reflect-metadata ship TypeScript types?

Yes. reflect-metadata bundles its own type declarations; no @types package is needed.

Links

Other commonjs packages

Similar popularity