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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. Markdown · 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 with a plain require()-able CommonJS entry is 3.0.3, published Mar 8, 2021; it declares support for Node.js >=8.

On Node.js 20.19+, 22.12+ and newer, require("is-path-inside") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("is-path-inside") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("is-path-inside") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const isPathInside = await import("is-path-inside"). That works on every Node.js version the package supports (>=12).
  3. If you need a synchronous require() or run Node.js 18: npm install is-path-inside@3.0.3, the last CommonJS release (published Mar 8, 2021); it declares Node.js >=8.
  4. TypeScript: no types are available for is-path-inside; declare the module yourself if you need them.
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 1.4.0✓ works✓ works

How to import is-path-inside

ES modules (import)

import * as isPathInside from "is-path-inside";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const isPathInside = require("is-path-inside");

// Any Node.js version the package supports (>=12), from an async function:
async function main() {
  const isPathInside = await import("is-path-inside");
}

// Or pin the last CommonJS release (declares Node.js >=8):
// 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, corrected where a runtime test of that version contradicted them (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 with a plain require()-able CommonJS entry is 3.0.3, published Mar 8, 2021; it declares support for Node.js >=8.

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; it declares Node.js >=8. 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?

From a CommonJS file, use a dynamic import inside an async function: const isPathInside = await import("is-path-inside"). That works on every Node.js version the package supports (>=12). On Node.js 20.19+, 22.12+ and newer, require("is-path-inside") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin is-path-inside@3.0.3 (declares Node.js >=8).

Does is-path-inside work in Bun?

Yes. import "is-path-inside" loaded successfully in Bun 1.4.0 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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