chore: replace jest with vitest

Author: Belco90

jest.config.js

@@ -47,9 +47,9 @@
 		"prettier-base": "prettier . --ignore-unknown --cache --log-level warn",
 		"rule-doc-generator": "eslint-doc-generator",
 		"semantic-release": "semantic-release",
-		"test": "jest",
-		"test:ci": "pnpm run test --ci --coverage",
-		"test:watch": "pnpm run test --watch",
+		"test": "vitest run",
+		"test:ci": "vitest run --coverage",
+		"test:watch": "vitest",
 		"type-check": "tsc --noEmit"
 	},
 	"dependencies": {
@@ -63,10 +63,9 @@
 		"@eslint/eslintrc": "^3.3.1",
 		"@eslint/js": "^9.35.0",
 		"@swc/core": "^1.9.3",
-		"@swc/jest": "^0.2.37",
-		"@types/jest": "^29.5.14",
 		"@types/node": "^22.9.3",
 		"@typescript-eslint/rule-tester": "^8.15.0",
+		"@vitest/coverage-v8": "^3.2.4",
 		"del-cli": "^6.0.0",
 		"eslint": "^9.35.0",
 		"eslint-config-prettier": "^10.1.8",
@@ -80,14 +79,15 @@
 		"eslint-remote-tester-repositories": "^1.0.1",
 		"globals": "^16.3.0",
 		"husky": "^9.1.7",
-		"jest": "^29.7.0",
+		"is-ci": "^3.0.1",
 		"lint-staged": "^15.2.10",
 		"prettier": "3.6.2",
 		"semantic-release": "^25.0.2",
 		"semver": "^7.6.3",
 		"ts-node": "^10.9.2",
 		"typescript": "^5.7.2",
-		"typescript-eslint": "^8.15.0"
+		"typescript-eslint": "^8.15.0",
+		"vitest": "^3.2.4"
 	},
 	"peerDependencies": {
 		"eslint": "^8.57.0 || ^9.0.0"

package.json

@@ -1,46 +1,42 @@
-import { existsSync } from 'fs';
-import { resolve } from 'path';
+import { existsSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+import { it, expect } from 'vitest';
 
 import plugin from '../lib';
 
 const numberOfRules = 28;
 const ruleNames = Object.keys(plugin.rules);
 
-// eslint-disable-next-line jest/expect-expect
 it('should have a corresponding doc for each rule', () => {
 	ruleNames.forEach((rule) => {
 		const docPath = resolve(__dirname, '../docs/rules', `${rule}.md`);
 
-		if (!existsSync(docPath)) {
-			throw new Error(
-				`Could not find documentation file for rule "${rule}" in path "${docPath}"`
-			);
-		}
+		expect(
+			existsSync(docPath),
+			`Could not find documentation file for rule "${rule}" in path "${docPath}"`
+		).toBe(true);
 	});
 });
 
-// eslint-disable-next-line jest/expect-expect
 it('should have a corresponding test for each rule', () => {
 	ruleNames.forEach((rule) => {
 		const testPath = resolve(__dirname, './lib/rules/', `${rule}.test.ts`);
 
-		if (!existsSync(testPath)) {
-			throw new Error(
-				`Could not find test file for rule "${rule}" in path "${testPath}"`
-			);
-		}
+		expect(
+			existsSync(testPath),
+			`Could not find test file for rule "${rule}" in path "${testPath}"`
+		).toBe(true);
 	});
 });
 
-// eslint-disable-next-line jest/expect-expect
 it('should have the correct amount of rules', () => {
 	const { length } = ruleNames;
 
-	if (length !== numberOfRules) {
-		throw new Error(
-			`There should be exactly ${numberOfRules} rules, but there are ${length}. If you've added a new rule, please update this number.`
-		);
-	}
+	expect(
+		numberOfRules,
+		`There should be exactly ${numberOfRules} rules, but there are ${length}. If you've added a new rule, please update this number.`
+	).toEqual(length);
 });
 
 it('should export configs that refer to actual rules', () => {

tests/index.test.ts

@@ -1,3 +1,5 @@
+import { it, expect, describe } from 'vitest';
+
 import {
 	isCustomTestingLibraryModule,
 	isOfficialTestingLibraryModule,

tests/lib/utils/is-testing-library-module.test.ts

@@ -1,4 +1,4 @@
 {
 	"extends": "./tsconfig.json",
-	"exclude": ["./tests", "./tools"]
+	"exclude": ["./tests", "./tools", "./vitest.*"]
 }

tsconfig.build.json

@@ -16,5 +16,5 @@
 		"outDir": "dist",
 		"sourceMap": false
 	},
-	"include": ["**/*.ts"]
+	"include": ["**/*.ts", "**/*.mts"]
 }

tsconfig.json

@@ -0,0 +1,16 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+	test: {
+		include: ['**/tests/**/*.test.ts'],
+		setupFiles: ['./vitest.setup.mts'],
+		coverage: {
+			thresholds: {
+				branches: 90,
+				functions: 90,
+				lines: 90,
+				statements: 90,
+			},
+		},
+	},
+});

vitest.config.mts

@@ -0,0 +1,10 @@
+import { RuleTester } from '@typescript-eslint/rule-tester';
+import * as vitest from 'vitest';
+
+// Setup for typescript-eslint RuleTester
+// https://typescript-eslint.io/packages/rule-tester/#vitest
+
+RuleTester.afterAll = vitest.afterAll;
+RuleTester.it = vitest.it;
+RuleTester.itOnly = vitest.it.only;
+RuleTester.describe = vitest.describe;