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Is side-channel-map ESM-only? Can you require() it?

Store information about any JS value in a side channel, using a Map

Last verified Sep 9, 2026 against side-channel-map@1.0.1. Markdown · JSON

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

side-channel-map ships CommonJS only. require("side-channel-map") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "side-channel-map" 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("side-channel-map") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.
  2. From ES modules use the default import: import sideChannelMap from "side-channel-map"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.0.1 (Dec 11, 2024)
Module format
CommonJS
Last CommonJS version
1.0.1
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
106.0M
License
MIT

Does side-channel-map@1.0.1 actually load? Runtime test results

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

Runtimerequire("side-channel-map")import "side-channel-map"
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 side-channel-map

ES modules (import)

import sideChannelMap from "side-channel-map";

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 sideChannelMap = require("side-channel-map");

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 (2 versions; the newest 2 shown).

VersionsFormatFirst published
1.0.0 – 1.0.1CommonJSDec 10, 2024

Frequently asked

Is side-channel-map ESM-only?

side-channel-map@1.0.1 is a CommonJS package. side-channel-map ships CommonJS only. require("side-channel-map") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "side-channel-map" 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 side-channel-map with ES module syntax?

Yes. import sideChannelMap from "side-channel-map" 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 side-channel-map work in Bun?

Yes. import "side-channel-map" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does side-channel-map ship TypeScript types?

Yes. side-channel-map bundles its own type declarations; no @types package is needed.

Links

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