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Is http-cache-semantics ESM-only? Can you require() it?

Parses Cache-Control and other headers. Helps building correct HTTP caches and proxies

Last verified Sep 9, 2026 against http-cache-semantics@4.2.0. Markdown · JSON

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

http-cache-semantics ships CommonJS only. require("http-cache-semantics") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "http-cache-semantics" 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("http-cache-semantics") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import httpCacheSemantics from "http-cache-semantics"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
4.2.0 (May 9, 2025)
Module format
CommonJS
Last CommonJS version
4.2.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
43.4M
License
BSD-2-Clause

Does http-cache-semantics@4.2.0 actually load? Runtime test results

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

Runtimerequire("http-cache-semantics")import "http-cache-semantics"
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 http-cache-semantics

ES modules (import)

import httpCacheSemantics from "http-cache-semantics";

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 httpCacheSemantics = require("http-cache-semantics");

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 (27 versions; the newest 27 shown).

VersionsFormatFirst published
1.0.0 – 4.2.0CommonJSMay 31, 2016

Frequently asked

Is http-cache-semantics ESM-only?

http-cache-semantics@4.2.0 is a CommonJS package. http-cache-semantics ships CommonJS only. require("http-cache-semantics") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "http-cache-semantics" 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 http-cache-semantics with ES module syntax?

Yes. import httpCacheSemantics from "http-cache-semantics" 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 http-cache-semantics work in Bun?

Yes. import "http-cache-semantics" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does http-cache-semantics ship TypeScript types?

Yes. http-cache-semantics bundles its own type declarations; no @types package is needed.

Links

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