# @vitest/mocker

> Vitest module mocker implementation

Latest version **5.0.3** (published 2026-09-30) · MIT license · 0 weekly downloads

## Install

```sh
npm install @vitest/mocker
pnpm add @vitest/mocker
yarn add @vitest/mocker
bun add @vitest/mocker
```

## Health

**Score 75/100 (B)** — status: active.

Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score; popular repo.

Warnings: low downloads.

## Facts

| | |
|---|---|
| Version | 5.0.3 |
| Published | 2026-09-30 |
| First published | 2024-09-09 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Dependencies | 4 |
| Unpacked size | 191.7 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 17159 |
| Maintainers | ariperkkio, antfu, hiogawa, oreanno, yyx990803 |
| Keywords | vitest, test, mock |

## Links

- npm: https://www.npmjs.com/package/@vitest/mocker
- Repository: https://github.com/vitest-dev/vitest
- Homepage: https://github.com/vitest-dev/vitest/tree/main/packages/mocker
- Issues: https://github.com/vitest-dev/vitest/issues
- Funding: https://opencollective.com/vitest
- npm.io page: https://npm.io/package/@vitest/mocker

## Dependencies (4)

- [@vitest/spy](https://npm.io/package/@vitest/spy.md) 5.0.3
- [magic-string](https://npm.io/package/magic-string.md) ^1.2.3
- [estree-walker](https://npm.io/package/estree-walker.md) ^3.0.3
- [@jridgewell/trace-mapping](https://npm.io/package/@jridgewell/trace-mapping.md) 0.3.31

## Alternatives

- [duck](https://npm.io/package/duck.md) — 4.2M weekly downloads
- [ava](https://npm.io/package/ava.md) — 560.2K weekly downloads
- [storybook-addon-module-mock](https://npm.io/package/storybook-addon-module-mock.md) — 71.7K weekly downloads
- [vest](https://npm.io/package/vest.md) — 50.1K weekly downloads
- [@ethereum-waffle/mock-contract](https://npm.io/package/@ethereum-waffle/mock-contract.md) — 40.0K weekly downloads

## Recent versions

- 5.0.3 (latest) — 2026-09-30
- 5.0.0-rc.4 (rc) — 2026-08-31
- 5.0.0-beta.7 (beta) — 2026-07-24
- 3.2.7 (V3) — 2026-07-06
- 5.0.2 — 2026-09-25
- 5.0.1 — 2026-09-15
- 5.0.0 — 2026-09-03
- 5.0.0-rc.3 — 2026-08-28
- 4.1.11 — 2026-08-18
- 5.0.0-rc.2 — 2026-08-17
- 5.0.0-rc.1 — 2026-08-11
- 5.0.0-beta.6 — 2026-07-06
- 4.1.10 — 2026-07-06
- 5.0.0-beta.5 — 2026-06-15
- 4.1.9 — 2026-06-15
- … 101 more at https://npm.io/package/@vitest/mocker/versions

## README

# @vitest/mocker

[![NPM version](https://img.shields.io/npm/v/@vitest/mocker?color=a1b858&label=)](https://npmx.dev/package/@vitest/mocker)

Vitest's module mocker implementation.

[GitHub](https://github.com/vitest-dev/vitest/blob/main/packages/mocker/) | [Documentation](https://github.com/vitest-dev/vitest/blob/main/packages/mocker/EXPORTS.md)

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_Source: https://npm.io/package/@vitest/mocker · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._