test: add vitest prep (#707)

Adds vitest and associated scripts which will not succeed yet, as we
have no projects.

Author: 43081j

package.json

@@ -22,7 +22,7 @@
     "lint:oxlint": "oxlint 'packages/**/*.{ts,tsx,js,jsx}'",
     "lint:tsc": "tsc -p tsconfig.json --noEmit",
     "lint-staged": "lint-staged",
-    "test": "pnpm test:karma && pnpm test:mocha",
+    "test": "pnpm test:karma && pnpm test:mocha && pnpm test:vitest",
     "test:minify": "pnpm test:karma:minify && pnpm test:mocha",
     "test:prod": "pnpm test:karma:prod && pnpm test:mocha:prod",
     "test:karma": "cross-env COVERAGE=true karma start karma.conf.js --single-run",
@@ -32,12 +32,13 @@
     "test:karma:prod:watch": "cross-env NODE_ENV=production karma start karma.conf.js --no-single-run",
     "test:mocha": "cross-env COVERAGE=true mocha --require test/node/setup.js --recursive packages/*/test/node/**.test.tsx",
     "test:mocha:prod": "cross-env COVERAGE=true NODE_ENV=production mocha --require test/node/setup.js --recursive packages/*/test/node/**.test.tsx",
+    "test:vitest": "cross-env COVERAGE=true vitest run",
     "docs:start": "cd docs && pnpm start",
     "docs:build": "cd docs && pnpm build",
     "docs:preview": "cd docs && pnpm preview",
     "ci:build": "pnpm build && pnpm docs:build",
     "ci:test": "pnpm lint && pnpm test",
-    "prepare": "husky install",
+    "prepare": "husky install && playwright install chromium",
     "format": "prettier --ignore-path .gitignore --write '**/*.{js,jsx,ts,tsx,yml,json,md}'",
     "version": "pnpm changeset version && pnpm i --lockfile-only"
   },
@@ -65,6 +66,7 @@
     "@types/node": "^18.19.103",
     "@types/sinon": "^10.0.13",
     "@types/sinon-chai": "^3.2.8",
+    "@vitest/coverage-v8": "^3.2.4",
     "babel-plugin-istanbul": "^6.1.1",
     "babel-plugin-transform-rename-properties": "^0.1.0",
     "buffer": "^6.0.3",
@@ -86,11 +88,13 @@
     "microbundle": "^0.15.1",
     "mocha": "^10.0.0",
     "oxlint": "^1.3.0",
+    "playwright": "^1.53.1",
     "prettier": "^3.6.2",
     "shx": "^0.3.4",
     "sinon": "^14.0.0",
     "sinon-chai": "^3.7.0",
-    "typescript": "~5.8.3"
+    "typescript": "~5.8.3",
+    "vitest": "^3.2.4"
   },
   "lint-staged": {
     "**/*.{js,jsx,ts,tsx,yml,json,md}": [