eslint-plugin-vitest

eslint-plugin-vitest

Eslint plugin for vitest

Installation

You'll first need to install ESLint:

npm i eslint --save-dev

Next, install eslint-plugin-vitest:

npm install eslint-plugin-vitest --save-dev

Usage

Add vitest to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:

{
  "plugins": ["vitest"]
}

Then configure the rules you want to use under the rules section.

{
  "rules": {
    "vitest/max-nested-describe": [
      "error",
      {
        "max": 3
      }
    ]
  }
}

Recommended

To use the recommended configuration, extend it in your .eslintrc file:

{
  "extends": ["plugin:vitest/recommended"]
}

All recommend rules will be set to error by default. You can however disable some rules by setting turning them off in your .eslintrc file or by setting them to warn in your .eslintrc.

all

To use the all configuration, extend it in your .eslintrc file:

{
  "extends": ["plugin:vitest/all"]
}

Running on test files only

This plugin assumes that you're running it on tests files only by default which sometimes is not the case. If you can to run it on test files only. Your configuration will look like this:

If you're using .eslintrc

{
	"extends": ["eslint:recommended"],
	"overrides": [
		{
			"files": ["tests/**"], // or any other pattern
			"plugins": ["vitest"],
			"extends": ["plugin:vitest/recommended"]
		}
	]
}

If you're using .eslintrc.js

import vitest from "eslint-plugin-vitest";

export default [
  {
    files: ["tests/**"], // or any other pattern
    plugins: {
      vitest,
    },
    rules: {
      ...vitest.configs.recommended.rules,
    },
    languageOptions: {
      globals: {
        ...vitest.environments.env.globals,
      },
    },
  },
];

Enabling with type-testing

Vitest ships with an optional type-testing feature, which is disabled by default.

If you're using this feature, you should also enabled typecheck in the settings for this plugin. This ensures that rules like expect-expect account for type-related assertions in tests.

{
  "extends": ["plugin:vitest/recommended"],
  "settings" :{
    "vitest": {
      "typecheck": true,
    }
  }
}

Rules

💼 Configurations enabled in.
⚠️ Configurations set to warn in.
🌐 Set in the all configuration.
✅ Set in the recommended configuration.
🔧 Automatically fixable by the --fix CLI option.
💡 Manually fixable by editor suggestions.
❌ Deprecated.

Name	Description	💼	⚠️	🔧	💡	❌
consistent-test-filename	forbidden .spec test file pattern		🌐
consistent-test-it	Prefer test or it but not both		🌐	🔧
expect-expect	Enforce having expectation in test body	✅
max-expects	Enforce a maximum number of expect per test		🌐
max-nested-describe	Nested describe block should be less than set max value or default value		🌐
no-alias-methods	Disallow alias methods		🌐	🔧
no-commented-out-tests	Disallow commented out tests	✅
no-conditional-expect	Disallow conditional expects		🌐
no-conditional-in-test	Disallow conditional tests		🌐
no-conditional-tests	Disallow conditional tests		🌐
no-disabled-tests	Disallow disabled tests		🌐
no-done-callback	Disallow using a callback in asynchronous tests and hooks		🌐		💡	❌
no-duplicate-hooks	Disallow duplicate hooks and teardown hooks		🌐
no-focused-tests	Disallow focused tests		🌐	🔧
no-hooks	Disallow setup and teardown hooks		🌐
no-identical-title	Disallow identical titles	✅		🔧
no-import-node-test	Disallow importing node:test	✅		🔧
no-interpolation-in-snapshots	Disallow string interpolation in snapshots		🌐	🔧
no-large-snapshots	Disallow large snapshots		🌐
no-mocks-import	Disallow importing from mocks directory		🌐
no-restricted-matchers	Disallow the use of certain matchers		🌐
no-restricted-vi-methods	Disallow specific vi. methods		🌐
no-standalone-expect	Disallow using expect outside of it or test blocks		🌐
no-test-prefixes	Disallow using test as a prefix		🌐	🔧
no-test-return-statement	Disallow return statements in tests		🌐
prefer-called-with	Suggest using toBeCalledWith() or toHaveBeenCalledWith()		🌐	🔧
prefer-comparison-matcher	Suggest using the built-in comparison matchers		🌐	🔧
prefer-each	Prefer each rather than manual loops		🌐
prefer-equality-matcher	Suggest using the built-in quality matchers		🌐		💡
prefer-expect-assertions	Suggest using expect assertions instead of callbacks		🌐		💡
prefer-expect-resolves	Suggest using expect().resolves over expect(await ...) syntax		🌐	🔧
prefer-hooks-in-order	Prefer having hooks in consistent order		🌐
prefer-hooks-on-top	Suggest having hooks before any test cases		🌐
prefer-lowercase-title	Enforce lowercase titles		🌐	🔧
prefer-mock-promise-shorthand	Prefer mock resolved/rejected shorthands for promises		🌐	🔧
prefer-snapshot-hint	Prefer including a hint with external snapshots		🌐
prefer-spy-on	Suggest using vi.spyOn		🌐	🔧
prefer-strict-equal	Prefer strict equal over equal		🌐		💡
prefer-to-be	Suggest using toBe()		🌐	🔧
prefer-to-be-falsy	Suggest using toBeFalsy()		🌐	🔧
prefer-to-be-object	Prefer toBeObject()		🌐	🔧
prefer-to-be-truthy	Suggest using toBeTruthy		🌐	🔧
prefer-to-contain	Prefer using toContain()		🌐	🔧
prefer-to-have-length	Suggest using toHaveLength()		🌐	🔧
prefer-todo	Suggest using test.todo		🌐	🔧
require-hook	Require setup and teardown to be within a hook		🌐
require-local-test-context-for-concurrent-snapshots	Require local Test Context for concurrent snapshot tests	✅
require-to-throw-message	Require toThrow() to be called with an error message		🌐
require-top-level-describe	Enforce that all tests are in a top-level describe		🌐
valid-describe-callback	Enforce valid describe callback	✅
valid-expect	Enforce valid expect() usage	✅
valid-title	Enforce valid titles	✅		🔧

Credits

• eslint-plugin-jest Most of the rules in this plugin are essentially ports of Jest plugin rules with minor modifications

Licence

MIT Licence © 2022 - present veritem