Migrate to vitest

[Juveniel]

No description provided.

[github-actions]

Packages Report

	core	default	classic	bootstrap	material	fluent	utils	html
Size	32.97 KB (0.0%)	849.69 KB (0.0%)	848.37 KB (0.0%)	863.50 KB (0.0%)	1047.35 KB (0.0%)	1290.83 KB (0.0%)	625.13 KB (0.0%)	48.49 MB (0.0%)
Gzip Size	5.35 KB (0.0%)	107.12 KB (0.0%)	107.43 KB (0.0%)	108.81 KB (0.0%)	122.75 KB (0.0%)	145.39 KB (0.0%)	52.15 KB (0.0%)	9.92 MB (0.0%)
Compile Time	0.8 s (0.0%)	2.8 s (0.0%)	2.7 s (0.0%)	2.5 s (0.0%)	2.8 s (0.0%)	3.0 s (0.0%)	2.2 s (0.0%)	3.7 s (0.0%)

[Copilot]

Pull request overview

This PR migrates the test suite from Jest to Vitest, a modern and faster test runner with better ESM support. The migration updates all test configurations, test imports, and custom reporters while maintaining existing test functionality.

Changes:

• Replaced Jest with Vitest across all test files and configurations
• Migrated custom specificity reporter from Jest to Vitest API
• Updated test imports from @jest/globals to vitest
• Modified TypeScript configuration for better ESM compatibility

Reviewed changes

Copilot reviewed 23 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
units/vitest.config.ts	New Vitest configuration for unit tests with jsdom environment
units/specificity-reporter.ts	Converted custom reporter from Jest API to Vitest Reporter interface
units/specificity-reporter.mjs	Removed old Jest reporter implementation
units/jest.config.mjs	Removed Jest configuration file
units/utility.ts	Updated test imports from Jest to Vitest
units/tsconfig.json	Changed moduleResolution to "bundler" and updated type definitions
units/specificity-analyzer.ts	Added placeholder tests for empty selector cases and updated imports
units/package.json	Updated test scripts to use Vitest commands
units/*/static.test.ts	Updated imports to include Vitest test functions
units/*/specificity.test.ts	Added describe import from Vitest
packages/html/vitest.config.ts	New Vitest configuration for HTML package tests
packages/html/tests/spec-requirements.test.ts	Converted to async/await ESM pattern with dynamic imports
packages/html/package.json	Updated test scripts and replaced ts-jest with vitest
packages/html/jest.config.js	Removed Jest configuration
package.json	Replaced Jest dependencies with Vitest and jsdom

[Copilot]

Pull request overview

Copilot reviewed 23 out of 24 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 23 out of 24 changed files in this pull request and generated 5 comments.

[Copilot]

Pull request overview

Copilot reviewed 23 out of 25 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 23 out of 25 changed files in this pull request and generated 7 comments.

Comments suppressed due to low confidence (1)

units/utility.ts:8

• units is ESM (type: module), so __dirname is not defined at runtime under Vitest. This file uses __dirname to build themeDir/nodeModulesDir/distDir, which will crash the test suite. Derive __dirname from import.meta.url (or switch these path resolutions to use new URL() with import.meta.url).

import { describe, it, expect } from "vitest";

const theme = process.env.THEME as string;
const themeDir = path.resolve(__dirname, "../packages", theme);
const themeScssDir = path.resolve(themeDir, "scss");

[zhpenkov]

Looking good