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

Convert Windows backslash paths to slash paths

Last verified Sep 9, 2026 against slash@5.1.0. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.0.0

slash dropped its CommonJS build in 4.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.0, published Apr 28, 2019.

On Node.js 20.19+, 22.12+ and every newer release, require("slash") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
5.1.0 (May 9, 2023)
Module format
ESM-only
Last CommonJS version
3.0.0
ESM-only since
4.0.0 (Apr 14, 2021)
TypeScript types
Bundled
Node engines
>=14.16
Weekly downloads
121.9M
License
MIT

Does slash@5.1.0 actually load? Runtime test results

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

Runtimerequire("slash")import "slash"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 slash

ES modules (import)

import slash from "slash";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const slash = require("slash");

// Any Node.js version:
const slash = await import("slash");

// Or pin the last CommonJS release:
// npm install slash@3.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (10 versions; the newest 10 shown).

VersionsFormatFirst published
4.0.0 – 5.1.0ESM-onlyApr 14, 2021
0.1.0 – 3.0.0CommonJSJul 18, 2013

Frequently asked

Is slash ESM-only?

slash@5.1.0 is ESM-only. slash dropped its CommonJS build in 4.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.0, published Apr 28, 2019.

Which version of slash still supports CommonJS / require()?

3.0.0 is the last version of slash with a CommonJS build. Install it with "npm install slash@3.0.0". Every version from 4.0.0 on is ESM-only.

How do I use slash from a CommonJS file?

Use a dynamic import: const mod = await import("slash"). On Node.js 20.19+, 22.12+ and newer, a plain require("slash") also works for ESM packages that do not use top-level await. Alternatively pin slash@3.0.0.

Does slash work in Bun?

Yes. import "slash" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does slash ship TypeScript types?

Yes. slash bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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