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Is is-path-inside ESM-only? Can you require() it?

Check if a path is inside another path

Last verified Sep 9, 2026 against is-path-inside@4.0.0. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.0.3

is-path-inside dropped its CommonJS build in 4.0.0 (May 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.3, published Mar 8, 2021.

On Node.js 20.19+, 22.12+ and every newer release, require("is-path-inside") 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
4.0.0 (May 3, 2021)
Module format
ESM-only
Last CommonJS version
3.0.3
ESM-only since
4.0.0 (May 3, 2021)
TypeScript types
None
Node engines
>=12
Weekly downloads
48.4M
License
MIT

Does is-path-inside@4.0.0 actually load? Runtime test results

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

Runtimerequire("is-path-inside")import "is-path-inside"
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 is-path-inside

ES modules (import)

import isPathInside from "is-path-inside";

CommonJS (require)

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

// Any Node.js version:
const isPathInside = await import("is-path-inside");

// Or pin the last CommonJS release:
// npm install is-path-inside@3.0.3

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
4.0.0ESM-onlyMay 3, 2021
0.1.0 – 3.0.3CommonJSJun 20, 2014

Frequently asked

Is is-path-inside ESM-only?

is-path-inside@4.0.0 is ESM-only. is-path-inside dropped its CommonJS build in 4.0.0 (May 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.3, published Mar 8, 2021.

Which version of is-path-inside still supports CommonJS / require()?

3.0.3 is the last version of is-path-inside with a CommonJS build. Install it with "npm install is-path-inside@3.0.3". Every version from 4.0.0 on is ESM-only.

How do I use is-path-inside from a CommonJS file?

Use a dynamic import: const mod = await import("is-path-inside"). On Node.js 20.19+, 22.12+ and newer, a plain require("is-path-inside") also works for ESM packages that do not use top-level await. Alternatively pin is-path-inside@3.0.3.

Does is-path-inside work in Bun?

Yes. import "is-path-inside" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-path-inside ship TypeScript types?

No. is-path-inside ships no type declarations and there is no @types package for it.

Links

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