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. JSON
Dual (CommonJS + ESM) Dual package — both require() and import work
tap publishes both a CommonJS entry and a native ESM entry (ESM added in 15.0.0). require("tap") and import "tap" both work on every supported Node.js version and in Bun.
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.
| Runtime | require("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 | ✗ failsERR_NOT_IMPLEMENTED | ✗ failsERR_NOT_IMPLEMENTED |
How to import tap
ES modules (import)
import tap from "tap";CommonJS (require)
const tap = require("tap");Module format by version
Derived from the type, main and exports fields of every stable release on npm (368 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 18.4.4 – 21.8.0 | Dual (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") and import "tap" both work on every supported Node.js version and in Bun.
Can I require tap?
Yes. tap ships a CommonJS entry, so require("tap") works on every Node.js version, alongside the native ESM entry for import.
Does tap work in Bun?
Importing tap failed in Bun 1.4 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
- minimatch 10.2.6Dual
- brace-expansion 5.0.9Dual
- lru-cache 11.5.2Dual
- glob 13.0.6Dual
- eslint-visitor-keys 5.0.1Dual
- yallist 5.0.0Dual
- balanced-match 4.0.4Dual
- js-yaml 5.4.1Dual
Similar popularity
- chalk-animation 2.0.3ESM-only
- svelte-preprocess 6.0.5CommonJS
- grunt-contrib-concat 2.1.0CommonJS
- react-hot-loader 4.13.1CommonJS
- babel-cli 6.26.0CommonJS
- gulp-if 3.0.0CommonJS
- extract-text-webpack-plugin 3.0.2CommonJS
- babelify 10.0.0CommonJS