canirequire

canirequire › Dual (CommonJS + ESM) › tap

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

A Test-Anything-Protocol library for JavaScript

Last verified Sep 9, 2026 against tap@21.8.0. Markdown · JSON

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

tap publishes both a CommonJS entry and a native ESM entry (ESM added in 15.0.0). require("tap") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. import "tap" works alongside it.

What to do

  1. Nothing to change. require("tap") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. import * as tap from "tap" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
21.8.0 (Sep 3, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
21.8.0
Native ESM since
15.0.0
TypeScript types
Bundled
Node engines
20 || >=22
Weekly downloads
312K
License
BlueOak-1.0.0

Does tap@21.8.0 actually load? Runtime test results

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

Runtimerequire("tap")import "tap"
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✗ failsERR_NOT_IMPLEMENTED✗ failsERR_NOT_IMPLEMENTED

How to import tap

ES modules (import)

import * as tap from "tap";

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

CommonJS (require)

const tap = require("tap");

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 (368 versions; the newest 60 shown).

VersionsFormatFirst published
18.4.4 – 21.8.0Dual (CommonJS + ESM)Oct 8, 2023

Frequently asked

Is tap ESM-only?

tap@21.8.0 ships CommonJS and ESM builds. tap publishes both a CommonJS entry and a native ESM entry (ESM added in 15.0.0). require("tap") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. import "tap" works alongside it.

Can I require tap?

Yes. tap ships a CommonJS entry alongside the native ESM entry. require("tap") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22.

Does tap work in Bun?

Importing tap failed in Bun 1.4.0 on Sep 9, 2026: NotImplementedError: node:v8 Serializer is not yet implemented in Bun.

Does tap ship TypeScript types?

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

Links

Other dual (commonjs + esm) packages

Similar popularity