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

Test whether an object looks like a promises-a+ promise

Last verified Sep 9, 2026 against is-promise@4.0.0. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

is-promise publishes both a CommonJS entry and a native ESM entry (ESM added in 2.2.0). require("is-promise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "is-promise" works alongside it.

What to do

  1. Nothing to change. require("is-promise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as isPromise from "is-promise" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: npm install -D @types/is-promise
Latest
4.0.0 (Apr 27, 2020)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
4.0.0
Native ESM since
2.2.0
TypeScript types
@types/is-promise
Node engines
not declared
Weekly downloads
75.1M
License
MIT

Does is-promise@4.0.0 actually load? Runtime test results

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

Runtimerequire("is-promise")import "is-promise"
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 is-promise

ES modules (import)

import * as isPromise from "is-promise";

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

CommonJS (require)

const isPromise = require("is-promise");

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 (9 versions; the newest 9 shown).

VersionsFormatFirst published
3.0.0 – 4.0.0Dual (CommonJS + ESM)Apr 26, 2020
2.2.2CommonJSApr 25, 2020
2.2.0 – 2.2.1Dual (CommonJS + ESM)Apr 25, 2020
1.0.0 – 2.1.0CommonJSDec 23, 2012

Frequently asked

Is is-promise ESM-only?

is-promise@4.0.0 ships CommonJS and ESM builds. is-promise publishes both a CommonJS entry and a native ESM entry (ESM added in 2.2.0). require("is-promise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "is-promise" works alongside it.

Can I require is-promise?

Yes. is-promise ships a CommonJS entry alongside the native ESM entry. require("is-promise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does is-promise work in Bun?

Yes. import "is-promise" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does is-promise ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/is-promise".

Links

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