Add Vitest config

eslint.config.mjs

@@ -1,9 +1,9 @@
 // @ts-check
 
 import base from '@metamask/eslint-config';
-import jest from '@metamask/eslint-config-jest';
 import nodejs from '@metamask/eslint-config-nodejs';
 import typescript from '@metamask/eslint-config-typescript';
+import vitest from '@metamask/eslint-config-vitest';
 // eslint-disable-next-line import-x/no-unresolved
 import tseslint from 'typescript-eslint';
 
@@ -29,15 +29,7 @@ const config = tseslint.config(
 
   {
     files: ['**/*.test.mjs'],
-    extends: jest,
-    rules: {
-      'no-shadow': [
-        'error',
-        {
-          allow: ['describe', 'it', 'expect'],
-        },
-      ],
-    },
+    extends: vitest,
   },
 
   {

package.json

@@ -26,9 +26,9 @@
     "@lavamoat/allow-scripts": "^3.0.4",
     "@metamask/auto-changelog": "^3.4.4",
     "@metamask/eslint-config": "^13.0.0",
-    "@metamask/eslint-config-jest": "workspace:^",
     "@metamask/eslint-config-nodejs": "^13.0.0",
     "@metamask/eslint-config-typescript": "workspace:^",
+    "@metamask/eslint-config-vitest": "workspace:^",
     "@metamask/utils": "^9.1.0",
     "@types/eslint__js": "^8.42.3",
     "@types/node": "^22.5.5",

packages/vitest/CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+[Unreleased]: https://github.com/MetaMask/eslint-config/

packages/vitest/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 MetaMask
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/vitest/README.md

@@ -0,0 +1,42 @@
+# `@metamask/eslint-config-vitest`
+
+MetaMask's [Vitest](https://vitest.dev/) ESLint configuration.
+
+## Usage
+
+```bash
+yarn add --dev \
+    @metamask/eslint-config@^13.0.0 \
+    @metamask/eslint-config-vitest@^0.0.0 \
+    @vitest/eslint-plugin@^1.1.4 \
+    eslint@^9.11.0 \
+    eslint-config-prettier@^9.1.0 \
+    eslint-plugin-import-x@^4.3.0 \
+    eslint-plugin-jsdoc@^50.2.4 \
+    eslint-plugin-prettier@^5.2.1 \
+    eslint-plugin-promise@^7.1.0 \
+    prettier@^3.3.3
+```
+
+The order in which you extend ESLint rules matters.
+The `@metamask/*` eslint configs should be added to the config array _last_,
+with `@metamask/eslint-config` first, and `@metamask/eslint-config-*` in any
+order thereafter.
+
+```js
+import base from '@metamask/eslint-config';
+import vitest from '@metamask/eslint-config-vitest';
+
+const config = {
+  // Any custom shared config should be added here.
+  // ...
+
+  // This should be added last unless you know what you're doing.
+  ...base,
+  ...vitest,
+
+  {
+    // Your overrides here.
+  }
+};
+```

packages/vitest/package.json

@@ -0,0 +1,64 @@
+{
+  "name": "@metamask/eslint-config-vitest",
+  "version": "0.0.0",
+  "description": "Shareable MetaMask ESLint config for Vitest.",
+  "homepage": "https://github.com/MetaMask/eslint-config#readme",
+  "bugs": {
+    "url": "https://github.com/MetaMask/eslint-config/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/MetaMask/eslint-config.git"
+  },
+  "license": "MIT",
+  "type": "module",
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./src/index.d.mts",
+        "default": "./src/index.mjs"
+      }
+    }
+  },
+  "main": "./src/index.mjs",
+  "types": "./src/index.d.mts",
+  "files": [
+    "src/",
+    "!src/**/*.test.mjs"
+  ],
+  "scripts": {
+    "lint:changelog": "auto-changelog validate",
+    "publish": "npm publish",
+    "test": "eslint ."
+  },
+  "dependencies": {
+    "@eslint/js": "^9.11.0",
+    "globals": "^15.9.0"
+  },
+  "devDependencies": {
+    "@jest/globals": "^29.7.0",
+    "@metamask/auto-changelog": "^3.4.4",
+    "@metamask/eslint-config": "^13.0.0",
+    "@vitest/eslint-plugin": "^1.1.4",
+    "eslint": "^9.11.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-import-x": "^4.3.0",
+    "eslint-plugin-jsdoc": "^50.2.4",
+    "eslint-plugin-prettier": "^5.2.1",
+    "jest": "^29.7.0",
+    "prettier": "^3.3.3",
+    "vitest": "^2.1.1"
+  },
+  "peerDependencies": {
+    "@metamask/eslint-config": "^13.0.0",
+    "@vitest/eslint-plugin": "^1.1.4",
+    "eslint": "^9.11.0"
+  },
+  "engines": {
+    "node": "^18.18 || >=20"
+  },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/"
+  }
+}

packages/vitest/rules-snapshot.json

@@ -0,0 +1,42 @@
+{
+  "vitest/consistent-test-it": ["error", { "fn": "it" }],
+  "vitest/expect-expect": "error",
+  "vitest/no-alias-methods": "error",
+  "vitest/no-commented-out-tests": "error",
+  "vitest/no-conditional-expect": "error",
+  "vitest/no-conditional-in-test": "error",
+  "vitest/no-disabled-tests": "error",
+  "vitest/no-duplicate-hooks": "error",
+  "vitest/no-focused-tests": "error",
+  "vitest/no-identical-title": "error",
+  "vitest/no-import-node-test": "error",
+  "vitest/no-interpolation-in-snapshots": "error",
+  "vitest/no-mocks-import": "error",
+  "vitest/no-restricted-matchers": [
+    "error",
+    {
+      "resolves": "Use `expect(await promise)` instead.",
+      "toBeFalsy": "Avoid `toBeFalsy`.",
+      "toBeTruthy": "Avoid `toBeTruthy`.",
+      "toMatchSnapshot": "Use `toMatchInlineSnapshot()` instead.",
+      "toThrowErrorMatchingSnapshot": "Use `toThrowErrorMatchingInlineSnapshot()` instead."
+    }
+  ],
+  "vitest/no-standalone-expect": "error",
+  "vitest/no-test-prefixes": "error",
+  "vitest/no-test-return-statement": "error",
+  "vitest/prefer-hooks-on-top": "error",
+  "vitest/prefer-lowercase-title": ["error", { "ignore": ["describe"] }],
+  "vitest/prefer-spy-on": "error",
+  "vitest/prefer-strict-equal": "error",
+  "vitest/prefer-to-be": "error",
+  "vitest/prefer-to-contain": "error",
+  "vitest/prefer-to-have-length": "error",
+  "vitest/prefer-todo": "error",
+  "vitest/require-local-test-context-for-concurrent-snapshots": "error",
+  "vitest/require-to-throw-message": "error",
+  "vitest/require-top-level-describe": "error",
+  "vitest/valid-describe-callback": "error",
+  "vitest/valid-expect": ["error", { "alwaysAwait": true }],
+  "vitest/valid-title": "error"
+}

packages/vitest/src/index.d.mts

@@ -0,0 +1,6 @@
+declare module '@metamask/eslint-config-vitest' {
+  import type { Linter } from 'eslint';
+
+  const config: Linter.Config[];
+  export default config;
+}

packages/vitest/src/index.mjs

@@ -0,0 +1,73 @@
+import vitest from '@vitest/eslint-plugin';
+
+/**
+ * @type {import('eslint').Linter.Config[]}
+ */
+const config = [
+  vitest.configs.recommended,
+
+  {
+    name: '@metamask/eslint-config-vitest',
+
+    files: [
+      '**/*.test.js',
+      '**/*.spec.js',
+      '**/*.test.mjs',
+      '**/*.spec.mjs',
+      '**/*.test.cjs',
+      '**/*.spec.cjs',
+      '**/*.test.ts',
+      '**/*.spec.ts',
+      '**/*.test.tsx',
+      '**/*.spec.tsx',
+      '**/*.test.mts',
+      '**/*.spec.mts',
+      '**/*.test.cts',
+      '**/*.spec.cts',
+      '**/*.test.mtsx',
+      '**/*.spec.mtsx',
+      '**/*.test.ctsx',
+      '**/*.spec.ctsx',
+    ],
+
+    rules: {
+      'vitest/consistent-test-it': ['error', { fn: 'it' }],
+      'vitest/no-alias-methods': 'error',
+      'vitest/no-commented-out-tests': 'error',
+      'vitest/no-conditional-expect': 'error',
+      'vitest/no-conditional-in-test': 'error',
+      'vitest/no-disabled-tests': 'error',
+      'vitest/no-duplicate-hooks': 'error',
+      'vitest/no-focused-tests': 'error',
+      'vitest/no-interpolation-in-snapshots': 'error',
+      'vitest/no-mocks-import': 'error',
+      'vitest/no-standalone-expect': 'error',
+      'vitest/no-test-prefixes': 'error',
+      'vitest/no-test-return-statement': 'error',
+      'vitest/prefer-hooks-on-top': 'error',
+      'vitest/prefer-lowercase-title': ['error', { ignore: ['describe'] }],
+      'vitest/prefer-spy-on': 'error',
+      'vitest/prefer-strict-equal': 'error',
+      'vitest/prefer-to-be': 'error',
+      'vitest/prefer-to-contain': 'error',
+      'vitest/prefer-to-have-length': 'error',
+      'vitest/prefer-todo': 'error',
+      'vitest/require-to-throw-message': 'error',
+      'vitest/require-top-level-describe': 'error',
+      'vitest/valid-expect': ['error', { alwaysAwait: true }],
+      'vitest/no-restricted-matchers': [
+        'error',
+        {
+          resolves: 'Use `expect(await promise)` instead.',
+          toBeFalsy: 'Avoid `toBeFalsy`.',
+          toBeTruthy: 'Avoid `toBeTruthy`.',
+          toMatchSnapshot: 'Use `toMatchInlineSnapshot()` instead.',
+          toThrowErrorMatchingSnapshot:
+            'Use `toThrowErrorMatchingInlineSnapshot()` instead.',
+        },
+      ],
+    },
+  },
+];
+
+export default config;

packages/vitest/src/index.test.mjs

@@ -0,0 +1,18 @@
+import { ESLint } from 'eslint';
+import { describe, it, expect } from 'vitest';
+
+import config from '.';
+
+describe('index', () => {
+  it('is a valid ESLint config', async () => {
+    const api = new ESLint({
+      baseConfig: config,
+    });
+
+    const result = await api.lintText(`export {};\n`);
+
+    expect(result[0].messages).toStrictEqual([]);
+    expect(result[0].warningCount).toBe(0);
+    expect(result[0].errorCount).toBe(0);
+  });
+});

yarn.lock

@@ -1106,7 +1106,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@metamask/eslint-config-jest@workspace:^, @metamask/eslint-config-jest@workspace:packages/jest":
+"@metamask/eslint-config-jest@workspace:packages/jest":
   version: 0.0.0-use.local
   resolution: "@metamask/eslint-config-jest@workspace:packages/jest"
   dependencies:
@@ -1209,6 +1209,31 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@metamask/eslint-config-vitest@workspace:^, @metamask/eslint-config-vitest@workspace:packages/vitest":
+  version: 0.0.0-use.local
+  resolution: "@metamask/eslint-config-vitest@workspace:packages/vitest"
+  dependencies:
+    "@eslint/js": ^9.11.0
+    "@jest/globals": ^29.7.0
+    "@metamask/auto-changelog": ^3.4.4
+    "@metamask/eslint-config": ^13.0.0
+    "@vitest/eslint-plugin": ^1.1.4
+    eslint: ^9.11.0
+    eslint-config-prettier: ^9.1.0
+    eslint-plugin-import-x: ^4.3.0
+    eslint-plugin-jsdoc: ^50.2.4
+    eslint-plugin-prettier: ^5.2.1
+    globals: ^15.9.0
+    jest: ^29.7.0
+    prettier: ^3.3.3
+    vitest: ^2.1.1
+  peerDependencies:
+    "@metamask/eslint-config": ^13.0.0
+    "@vitest/eslint-plugin": ^1.1.4
+    eslint: ^9.11.0
+  languageName: unknown
+  linkType: soft
+
 "@metamask/eslint-config@^13.0.0, @metamask/eslint-config@workspace:packages/base":
   version: 0.0.0-use.local
   resolution: "@metamask/eslint-config@workspace:packages/base"
@@ -1877,6 +1902,25 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@vitest/eslint-plugin@npm:^1.1.4":
+  version: 1.1.4
+  resolution: "@vitest/eslint-plugin@npm:1.1.4"
+  peerDependencies:
+    "@typescript-eslint/utils": ">= 8.0"
+    eslint: ">= 8.57.0"
+    typescript: ">= 5.0.0"
+    vitest: "*"
+  peerDependenciesMeta:
+    "@typescript-eslint/utils":
+      optional: true
+    typescript:
+      optional: true
+    vitest:
+      optional: true
+  checksum: 270ecd5e01ec42368cb05179ecf5d3a14350aa166143cea86416d1a03983568dff7d8437440fe51df60dadb8f06c4f4ad9d67404987fd22e76259ebc494e19d7
+  languageName: node
+  linkType: hard
+
 "@vitest/expect@npm:2.1.1":
   version: 2.1.1
   resolution: "@vitest/expect@npm:2.1.1"
@@ -5643,9 +5687,9 @@ __metadata:
     "@lavamoat/allow-scripts": ^3.0.4
     "@metamask/auto-changelog": ^3.4.4
     "@metamask/eslint-config": ^13.0.0
-    "@metamask/eslint-config-jest": "workspace:^"
     "@metamask/eslint-config-nodejs": ^13.0.0
     "@metamask/eslint-config-typescript": "workspace:^"
+    "@metamask/eslint-config-vitest": "workspace:^"
     "@metamask/utils": ^9.1.0
     "@types/eslint__js": ^8.42.3
     "@types/node": ^22.5.5