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Is vary ESM-only? Can you require() it?

Manipulate the HTTP Vary header

Last verified Sep 9, 2026 against vary@1.1.2. Markdown · JSON

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

vary ships CommonJS only. require("vary") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8. import "vary" 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("vary") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.
  2. From ES modules use the default import: import vary from "vary"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/vary
Latest
1.1.2 (Sep 24, 2017)
Module format
CommonJS
Last CommonJS version
1.1.2
TypeScript types
@types/vary
Node engines
>= 0.8
Weekly downloads
100.2M
License
MIT

Does vary@1.1.2 actually load? Runtime test results

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

Runtimerequire("vary")import "vary"
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 vary

ES modules (import)

import vary from "vary";

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 vary = require("vary");

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 (7 versions; the newest 7 shown).

VersionsFormatFirst published
0.0.0 – 1.1.2CommonJSJun 4, 2014

Frequently asked

Is vary ESM-only?

vary@1.1.2 is a CommonJS package. vary ships CommonJS only. require("vary") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8. import "vary" 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 vary with ES module syntax?

Yes. import vary from "vary" 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 vary work in Bun?

Yes. import "vary" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does vary ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/vary".

Links

Other commonjs packages

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