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## eslint-plugin-vitest
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[](https://github.com/veritem/eslint-plugin-vitest/actions/workflows/ci.yml)
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Eslint plugin for vitest
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### Installation
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You'll first need to install [ESLint](https://eslint.org/):
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```sh
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npm i eslint --save-dev
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```
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Next, install `@vitest/eslint-plugin`
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```sh
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npm install @vitest/eslint-plugin --save-dev
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```
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### Usage
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Make sure you're running eslint `v9.0.0` or higher for the latest version of this plugin to work. The following example is how your `eslint.config.js` should be setup for this plugin to work for you.
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```js
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import vitest from "@vitest/eslint-plugin";
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export default [
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{
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files: ["tests/**"], // or any other pattern
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plugins: {
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vitest
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},
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rules: {
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...vitest.configs.recommended.rules, // you can also use vitest.configs.all.rules to enable all rules
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"vitest/max-nested-describe": ["error", { "max": 3 }] // you can also modify rules' behavior using option like this
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},
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},
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];
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```
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If you're not using the latest version of eslint (version `v8.57.0` or lower) you can setup this plugin using the following configuration
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Add `vitest` to the plugins section of your `.eslintrc` configuration file. You can omit the `eslint-plugin-` prefix:
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```json
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{
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"plugins": ["@vitest"]
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}
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```
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Then configure the rules you want to use under the rules section.
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```json
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{
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"rules": {
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"vitest/max-nested-describe": [
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"error",
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{
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"max": 3
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}
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]
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}
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}
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```
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If you're using old Eslint configuration, make sure to use legacy key like the following
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```js
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{
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"extends": ["plugin:@vitest/legacy-recommended"] // or legacy-all
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}
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```
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#### Enabling with type-testing
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Vitest ships with an optional [type-testing feature](https://vitest.dev/guide/testing-types), which is disabled by default.
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If you're using this feature, you should also enabled `typecheck` in the settings for this plugin. This ensures that rules like [expect-expect](docs/rules/expect-expect.md) account for type-related assertions in tests.
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```js
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import vitest from "@vitest/eslint-plugin";
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export default [
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{
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files: ["tests/**"], // or any other pattern
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plugins: {
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vitest,
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},
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rules: {
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...vitest.configs.recommended.rules,
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},
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settings: {
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vitest: {
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typecheck: true
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}
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},
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languageOptions: {
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globals: {
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...vitest.environments.env.globals,
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},
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},
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},
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]
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```
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### Rules
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<!-- begin auto-generated rules list -->
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💼 Configurations enabled in.\
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⚠️ Configurations set to warn in.\
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🌐 Set in the `all` configuration.\
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✅ Set in the `recommended` configuration.\
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🔧 Automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/user-guide/command-line-interface#--fix).\
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💡 Manually fixable by [editor suggestions](https://eslint.org/docs/latest/use/core-concepts#rule-suggestions).\
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❌ Deprecated.
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| Name | Description | 💼 | ⚠️ | 🔧 | 💡 | ❌ |
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| :----------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | :- | :- | :- | :- | :- |
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| [consistent-test-filename](docs/rules/consistent-test-filename.md) | require .spec test file pattern | | 🌐 | | | |
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| [consistent-test-it](docs/rules/consistent-test-it.md) | enforce using test or it but not both | | 🌐 | 🔧 | | |
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| [expect-expect](docs/rules/expect-expect.md) | enforce having expectation in test body | ✅ | | | | |
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| [max-expects](docs/rules/max-expects.md) | enforce a maximum number of expect per test | | 🌐 | | | |
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| [max-nested-describe](docs/rules/max-nested-describe.md) | require describe block to be less than set max value or default value | | 🌐 | | | |
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| [no-alias-methods](docs/rules/no-alias-methods.md) | disallow alias methods | | 🌐 | 🔧 | | |
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| [no-commented-out-tests](docs/rules/no-commented-out-tests.md) | disallow commented out tests | ✅ | | | | |
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| [no-conditional-expect](docs/rules/no-conditional-expect.md) | disallow conditional expects | | 🌐 | | | |
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| [no-conditional-in-test](docs/rules/no-conditional-in-test.md) | disallow conditional tests | | 🌐 | | | |
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| [no-conditional-tests](docs/rules/no-conditional-tests.md) | disallow conditional tests | | 🌐 | | | |
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| [no-disabled-tests](docs/rules/no-disabled-tests.md) | disallow disabled tests | | 🌐 | | | |
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| [no-done-callback](docs/rules/no-done-callback.md) | disallow using a callback in asynchronous tests and hooks | | 🌐 | | 💡 | ❌ |
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| [no-duplicate-hooks](docs/rules/no-duplicate-hooks.md) | disallow duplicate hooks and teardown hooks | | 🌐 | | | |
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| [no-focused-tests](docs/rules/no-focused-tests.md) | disallow focused tests | | 🌐 | 🔧 | | |
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| [no-hooks](docs/rules/no-hooks.md) | disallow setup and teardown hooks | | 🌐 | | | |
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| [no-identical-title](docs/rules/no-identical-title.md) | disallow identical titles | ✅ | | 🔧 | | |
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| [no-import-node-test](docs/rules/no-import-node-test.md) | disallow importing `node:test` | ✅ | | 🔧 | | |
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| [no-interpolation-in-snapshots](docs/rules/no-interpolation-in-snapshots.md) | disallow string interpolation in snapshots | | 🌐 | 🔧 | | |
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| [no-large-snapshots](docs/rules/no-large-snapshots.md) | disallow large snapshots | | 🌐 | | | |
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| [no-mocks-import](docs/rules/no-mocks-import.md) | disallow importing from __mocks__ directory | | 🌐 | | | |
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| [no-restricted-matchers](docs/rules/no-restricted-matchers.md) | disallow the use of certain matchers | | 🌐 | | | |
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| [no-restricted-vi-methods](docs/rules/no-restricted-vi-methods.md) | disallow specific `vi.` methods | | 🌐 | | | |
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| [no-standalone-expect](docs/rules/no-standalone-expect.md) | disallow using `expect` outside of `it` or `test` blocks | | 🌐 | | | |
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| [no-test-prefixes](docs/rules/no-test-prefixes.md) | disallow using `test` as a prefix | | 🌐 | 🔧 | | |
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| [no-test-return-statement](docs/rules/no-test-return-statement.md) | disallow return statements in tests | | 🌐 | | | |
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| [prefer-called-with](docs/rules/prefer-called-with.md) | enforce using `toBeCalledWith()` or `toHaveBeenCalledWith()` | | 🌐 | 🔧 | | |
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| [prefer-comparison-matcher](docs/rules/prefer-comparison-matcher.md) | enforce using the built-in comparison matchers | | 🌐 | 🔧 | | |
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| [prefer-each](docs/rules/prefer-each.md) | enforce using `each` rather than manual loops | | 🌐 | | | |
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| [prefer-equality-matcher](docs/rules/prefer-equality-matcher.md) | enforce using the built-in quality matchers | | 🌐 | | 💡 | |
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| [prefer-expect-assertions](docs/rules/prefer-expect-assertions.md) | enforce using expect assertions instead of callbacks | | 🌐 | | 💡 | |
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| [prefer-expect-resolves](docs/rules/prefer-expect-resolves.md) | enforce using `expect().resolves` over `expect(await ...)` syntax | | 🌐 | 🔧 | | |
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| [prefer-hooks-in-order](docs/rules/prefer-hooks-in-order.md) | enforce having hooks in consistent order | | 🌐 | | | |
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| [prefer-hooks-on-top](docs/rules/prefer-hooks-on-top.md) | enforce having hooks before any test cases | | 🌐 | | | |
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| [prefer-lowercase-title](docs/rules/prefer-lowercase-title.md) | enforce lowercase titles | | 🌐 | 🔧 | | |
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| [prefer-mock-promise-shorthand](docs/rules/prefer-mock-promise-shorthand.md) | enforce mock resolved/rejected shorthands for promises | | 🌐 | 🔧 | | |
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| [prefer-snapshot-hint](docs/rules/prefer-snapshot-hint.md) | enforce including a hint with external snapshots | | 🌐 | | | |
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| [prefer-spy-on](docs/rules/prefer-spy-on.md) | enforce using `vi.spyOn` | | 🌐 | 🔧 | | |
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| [prefer-strict-equal](docs/rules/prefer-strict-equal.md) | enforce strict equal over equal | | 🌐 | | 💡 | |
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| [prefer-to-be](docs/rules/prefer-to-be.md) | enforce using toBe() | | 🌐 | 🔧 | | |
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| [prefer-to-be-falsy](docs/rules/prefer-to-be-falsy.md) | enforce using toBeFalsy() | | 🌐 | 🔧 | | |
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| [prefer-to-be-object](docs/rules/prefer-to-be-object.md) | enforce using toBeObject() | | 🌐 | 🔧 | | |
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| [prefer-to-be-truthy](docs/rules/prefer-to-be-truthy.md) | enforce using `toBeTruthy` | | 🌐 | 🔧 | | |
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| [prefer-to-contain](docs/rules/prefer-to-contain.md) | enforce using toContain() | | 🌐 | 🔧 | | |
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| [prefer-to-have-length](docs/rules/prefer-to-have-length.md) | enforce using toHaveLength() | | 🌐 | 🔧 | | |
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| [prefer-todo](docs/rules/prefer-todo.md) | enforce using `test.todo` | | 🌐 | 🔧 | | |
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| [prefer-vi-mocked](docs/rules/prefer-vi-mocked.md) | Prefer `vi.mocked()` over `fn as Mock` | | 🌐 | 🔧 | | |
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| [require-hook](docs/rules/require-hook.md) | require setup and teardown to be within a hook | | 🌐 | | | |
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| [require-local-test-context-for-concurrent-snapshots](docs/rules/require-local-test-context-for-concurrent-snapshots.md) | require local Test Context for concurrent snapshot tests | ✅ | | | | |
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| [require-to-throw-message](docs/rules/require-to-throw-message.md) | require toThrow() to be called with an error message | | 🌐 | | | |
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| [require-top-level-describe](docs/rules/require-top-level-describe.md) | enforce that all tests are in a top-level describe | | 🌐 | | | |
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| [valid-describe-callback](docs/rules/valid-describe-callback.md) | enforce valid describe callback | ✅ | | | | |
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| [valid-expect](docs/rules/valid-expect.md) | enforce valid `expect()` usage | ✅ | | | | |
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| [valid-title](docs/rules/valid-title.md) | enforce valid titles | ✅ | | 🔧 | | |
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<!-- end auto-generated rules list -->
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#### Credits
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- [eslint-plugin-jest](https://github.com/jest-community/eslint-plugin-jest)
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Most of the rules in this plugin are essentially ports of Jest plugin rules with minor modifications
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### Licence
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[MIT](https://github.com/veritem/eslint-plugin-vitest/blob/main/LICENSE) Licence © 2022 - present [veritem](https://github.com/veritem) and contributors
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