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Is internal-slot ESM-only? Can you require() it?

ES spec-like internal slots

Last verified Sep 9, 2026 against internal-slot@1.1.0. JSON

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

internal-slot ships CommonJS only. require("internal-slot") works everywhere. import "internal-slot" 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
1.1.0 (Dec 13, 2024)
Module format
CommonJS
Last CommonJS version
1.1.0
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
79.2M
License
MIT

Does internal-slot@1.1.0 actually load? Runtime test results

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

Runtimerequire("internal-slot")import "internal-slot"
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 internal-slot

ES modules (import)

import internalSlot from "internal-slot";

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 internalSlot = require("internal-slot");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (9 versions; the newest 9 shown).

VersionsFormatFirst published
1.0.0 – 1.1.0CommonJSOct 21, 2019

Frequently asked

Is internal-slot ESM-only?

internal-slot@1.1.0 is a CommonJS package. internal-slot ships CommonJS only. require("internal-slot") works everywhere. import "internal-slot" 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 internal-slot with ES module syntax?

Yes. import internalSlot from "internal-slot" 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 internal-slot work in Bun?

Yes. import "internal-slot" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does internal-slot ship TypeScript types?

Yes. internal-slot bundles its own type declarations; no @types package is needed.

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