Switch test suite to vitest

.eslintrc.json

@@ -157,11 +157,13 @@
     },
     "overrides": [
         {
-            "files": ["tests/**/*.ts"],
-            "extends": ["plugin:jest/recommended", "plugin:jest/style"]
+            "files": ["./*.config.?(m|c)@(t|j)s", "./scripts/**/*.config.?(m|c)@(t|j)s"],
+            "rules": {
+                "import/no-default-export": "off"
+            }
         },
         {
-            "files": ["scripts/**/*.?(m|c)js"],
+            "files": ["scripts/**/*.?(m|c)@(t|j)s"],
             "rules": {
                 "no-console": "off"
             }

.github/workflows/npm-publish.yml

@@ -24,7 +24,7 @@ jobs:
                       yarn-node-20-lock-
             - run: yarn install --frozen-lockfile
             - run: yarn lint
-            - run: yarn test --ci --coverage --maxWorkers=2
+            - run: yarn test
             - run: yarn build
             - uses: actions/upload-artifact@v4
               with:

.github/workflows/test.yml

@@ -24,11 +24,32 @@ jobs:
                       yarn-node-20-lock-
             - run: yarn install --frozen-lockfile
             - run: yarn lint
-            - run: yarn test --ci --coverage --maxWorkers=2
+            - run: yarn test
             - run: yarn build
             - uses: actions/upload-artifact@v4
               with:
                   name: build-output
                   path: dist
                   if-no-files-found: error
             - run: yarn test:exports
+    benchmark:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Use Node.js 20
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.11.1
+            - name: Use node_modules cache
+              uses: actions/cache@v4
+              with:
+                  path: node_modules
+                  key: yarn-node-20-lock-${{ hashFiles('yarn.lock') }}
+                  restore-keys: |
+                      yarn-node-20-lock-
+            - run: yarn install --frozen-lockfile
+            - name: Run benchmark
+              uses: CodSpeedHQ/action@v3
+              with:
+                  token: ${{ secrets.CODSPEED_TOKEN }}
+                  run: yarn bench

package.json

@@ -51,9 +51,9 @@
     "sideEffects": false,
     "scripts": {
         "build": "rollup --config scripts/rollup.config.mjs",
-        "bench": "vitest bench --run",
-        "test": "jest test --config scripts/jest.config.mjs --coverage",
-        "test:watch": "jest test --config scripts/jest.config.mjs --watch",
+        "bench": "vitest bench --config scripts/vitest.config.mts",
+        "test": "vitest --config scripts/vitest.config.mts --coverage",
+        "test:watch": "vitest --config scripts/vitest.config.mts",
         "test:exports": "node scripts/test-built-package-exports.cjs && node scripts/test-built-package-exports.mjs",
         "lint": "eslint --max-warnings 0 '**'",
         "preversion": "if [ -n \"$DANYS_MACHINE\" ]; then git checkout main && git pull; fi",
@@ -68,21 +68,18 @@
         "@rollup/plugin-babel": "^6.0.4",
         "@rollup/plugin-node-resolve": "^15.2.3",
         "@rollup/plugin-typescript": "^11.1.6",
-        "@types/jest": "^29.5.12",
         "@typescript-eslint/eslint-plugin": "^8.0.1",
         "@typescript-eslint/parser": "^8.0.1",
+        "@vitest/coverage-v8": "^2.0.5",
         "babel-plugin-annotate-pure-calls": "^0.4.0",
         "babel-plugin-polyfill-regenerator": "^0.6.2",
         "eslint": "^8.57.0",
         "eslint-plugin-import": "^2.29.1",
-        "eslint-plugin-jest": "^28.6.0",
         "globby": "^11.1.0",
-        "jest": "^29.7.0",
         "prettier": "^3.3.3",
         "rollup": "^4.19.1",
         "rollup-plugin-delete": "^2.0.0",
         "rollup-plugin-dts": "^6.1.1",
-        "ts-jest": "^29.2.3",
         "tslib": "^2.6.3",
         "typescript": "^5.5.4",
         "vitest": "^2.0.5",

scripts/rollup.config.mjs

@@ -9,7 +9,6 @@ import { dts } from 'rollup-plugin-dts'
 
 import pkg from '../package.json' assert { type: 'json' }
 
-// eslint-disable-next-line import/no-default-export
 export default defineConfig([
     // Default entry point
     {

scripts/vitest.config.mts

@@ -0,0 +1,14 @@
+/// <reference types="vitest" />
+
+import codspeedPlugin from '@codspeed/vitest-plugin'
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+    // When Codspeed plugin is enabled, benchmark results don't get logged. More info: https://github.com/CodSpeedHQ/codspeed-node/issues/36
+    plugins: process.env.CI ? [codspeedPlugin()] : undefined,
+    test: {
+        coverage: {
+            include: ['src/**/*.ts'],
+        },
+    },
+})

tests/arbitrary-properties.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('handles arbitrary property conflicts correctly', () => {

tests/arbitrary-values.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('handles simple conflicts with arbitrary values correctly', () => {

tests/arbitrary-variants.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('basic arbitrary variants', () => {

tests/class-group-conflicts.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('merges classes from same group correctly', () => {

tests/class-map.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { getDefaultConfig } from '../src'
 import { ClassPartObject, createClassMap } from '../src/lib/class-group-utils'
 

tests/colors.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('handles color conflicts properly', () => {

tests/conflicts-across-class-groups.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('handles conflicts across class groups correctly', () => {

tests/content-utilities.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('merges content utilities correctly', () => {

tests/create-tailwind-merge.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { createTailwindMerge } from '../src'
 
 test('createTailwindMerge works with single config function', () => {

tests/default-config.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { getDefaultConfig } from '../src'
 import { Config, DefaultClassGroupIds, DefaultThemeGroupIds } from '../src/lib/types'
 

tests/docs-examples.test.ts

@@ -1,6 +1,7 @@
 import fs from 'fs'
 
 import globby from 'globby'
+import { expect, test } from 'vitest'
 
 import { twMerge } from '../src'
 

tests/experimental-parse-class-name.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { extendTailwindMerge } from '../src'
 
 test('default case', () => {

tests/extend-tailwind-merge.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { extendTailwindMerge } from '../src'
 
 test('extendTailwindMerge works correctly with single config', () => {

tests/important-modifier.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('merges tailwind classes with important modifier correctly', () => {

tests/lazy-initialization.test.ts

@@ -1,7 +1,9 @@
+import { expect, test, vi } from 'vitest'
+
 import { createTailwindMerge, getDefaultConfig } from '../src'
 
 test('lazy initialization', () => {
-    const initMock = jest.fn(getDefaultConfig)
+    const initMock = vi.fn(getDefaultConfig)
     const twMerge = createTailwindMerge(initMock)
 
     expect(initMock).not.toHaveBeenCalled()

tests/merge-configs.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { mergeConfigs } from '../src'
 
 test('mergeConfigs has correct behavior', () => {

tests/modifiers.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { createTailwindMerge, twMerge } from '../src'
 
 test('conflicts across prefix modifiers', () => {

tests/negative-values.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('handles negative value conflicts correctly', () => {

tests/non-conflicting-classes.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('merges non-conflicting classes correctly', () => {

tests/non-tailwind-classes.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('does not alter non-tailwind classes', () => {

tests/per-side-border-colors.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('merges classes with per-side border colors correctly', () => {

tests/prefixes.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { extendTailwindMerge } from '../src'
 
 test('prefix working correctly', () => {

tests/pseudo-variants.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { twMerge } from '../src'
 
 test('handles pseudo variants conflicts properly', () => {

tests/public-api.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import {
     ClassNameValue,
     ClassValidator,
@@ -18,7 +20,7 @@ test('has correct export types', () => {
     expect(twMerge).toStrictEqual(expect.any(Function))
     expect(createTailwindMerge).toStrictEqual(expect.any(Function))
     expect(getDefaultConfig).toStrictEqual(expect.any(Function))
-    expect(validators).toEqual({
+    expect(validators).toMatchObject({
         isAny: expect.any(Function),
         isArbitraryLength: expect.any(Function),
         isArbitraryNumber: expect.any(Function),
@@ -33,6 +35,7 @@ test('has correct export types', () => {
         isNumber: expect.any(Function),
         isTshirtSize: expect.any(Function),
     })
+    expect(Object.keys(validators)).toHaveLength(13)
     expect(mergeConfigs).toStrictEqual(expect.any(Function))
     expect(extendTailwindMerge).toStrictEqual(expect.any(Function))
     expect(twJoin).toStrictEqual(expect.any(Function))

tests/separators.test.ts

@@ -1,3 +1,5 @@
+import { expect, test } from 'vitest'
+
 import { extendTailwindMerge } from '../src'
 
 test('single character separator working correctly', () => {