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

two functions: One that returns true, one that returns false

Last verified Sep 9, 2026 against boolbase@2.0.0. JSON

ESM-only ESM-only since 2.0.0 — last CommonJS version is 1.0.0

boolbase dropped its CommonJS build in 2.0.0 (March 2026). The last version you can require() on every Node.js version, including 18 and older, is 1.0.0, published Feb 15, 2014.

On Node.js 20.19+, 22.12+ and every newer release, require("boolbase") 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.

boolbase@2.0.0 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

Latest
2.0.0 (Mar 17, 2026)
Module format
ESM-only
Last CommonJS version
1.0.0
ESM-only since
2.0.0 (Mar 17, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
Weekly downloads
56.6M
License
ISC

Does boolbase@2.0.0 actually load? Runtime test results

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

Runtimerequire("boolbase")import "boolbase"
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 boolbase

ES modules (import)

import boolbase from "boolbase";

CommonJS (require)

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

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

// Or pin the last CommonJS release:
// npm install boolbase@1.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (2 versions; the newest 2 shown).

VersionsFormatFirst published
2.0.0ESM-onlyMar 17, 2026
1.0.0CommonJSFeb 15, 2014

Frequently asked

Is boolbase ESM-only?

boolbase@2.0.0 is ESM-only. boolbase dropped its CommonJS build in 2.0.0 (March 2026). The last version you can require() on every Node.js version, including 18 and older, is 1.0.0, published Feb 15, 2014.

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

1.0.0 is the last version of boolbase with a CommonJS build. Install it with "npm install boolbase@1.0.0". Every version from 2.0.0 on is ESM-only.

How do I use boolbase from a CommonJS file?

Use a dynamic import: const mod = await import("boolbase"). On Node.js 20.19+, 22.12+ and newer, a plain require("boolbase") also works for ESM packages that do not use top-level await. Alternatively pin boolbase@1.0.0.

Does boolbase work in Bun?

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

Does boolbase ship TypeScript types?

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

Links

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