test: migrate repo from jest to vitest

Author: vladholubiev

jest.config.js

@@ -2,21 +2,31 @@
   "name": "@shelf/array-chunk-by-size",
   "version": "4.0.0",
   "description": "Chunk array of objects by their size in JSON",
-  "keywords": ["array", "chunk", "json", "split", "separate", "string"],
+  "keywords": [
+    "array",
+    "chunk",
+    "json",
+    "split",
+    "separate",
+    "string"
+  ],
   "repository": "shelfio/array-chunk-by-size",
   "type": "module",
   "exports": "./lib/index.js",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
-  "files": ["lib/"],
+  "files": [
+    "lib/"
+  ],
   "scripts": {
     "build": "rm -rf lib/ && tsc",
-    "coverage": "jest --coverage",
+    "coverage": "vitest run --coverage",
     "lint": "biome check --write .",
     "lint:ci": "biome check .",
     "prepack": "pnpm run build",
     "prepare": "husky",
-    "test": "export ENVIRONMENT=local && jest src",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "type-check": "tsc --noEmit",
     "type-check:watch": "pnpm run type-check -- --watch"
   },
@@ -26,14 +36,12 @@
   "devDependencies": {
     "@biomejs/biome": "2.4.6",
     "@shelf/tsconfig": "0.1.0",
-    "@swc/core": "1.13.3",
-    "@swc/jest": "0.2.39",
-    "@types/jest": "30.0.0",
     "@types/node": "22",
+    "@vitest/coverage-v8": "4.0.18",
     "husky": "9.1.7",
-    "jest": "30.0.5",
     "lint-staged": "16.1.5",
-    "typescript": "5.9.3"
+    "typescript": "5.9.3",
+    "vitest": "4.0.18"
   },
   "engines": {
     "node": ">=22"

package.json

@@ -1,3 +1,4 @@
+import {expect, it} from 'vitest';
 import {chunkArray} from './index';
 
 function getObjWithSize(times: number) {

src/index.test.ts

@@ -0,0 +1,17 @@
+import {defineConfig} from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    include: ['src/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      thresholds: {
+        branches: 80,
+        functions: 80,
+        lines: 80,
+        statements: 80,
+      },
+    },
+  },
+});