vitest.config.js

import { defineConfig, configDefaults } from 'vitest/config';

// Coverage-only config. Test discovery stays on Vitest defaults (it already finds
// the co-located *.test.js files), so `npm test` behaves exactly as before —
// instrumentation activates only under `--coverage` (`npm run coverage`).
export default defineConfig({
  test: {
    // docs/csop-handoff is a self-contained research prototype (its own package.json/tsconfig);
    // its *.test.ts run under its own toolchain, never the product suite.
    exclude: [
      ...configDefaults.exclude,
      'tools/corpus/**',
      '_public_sync/**',
      'docs/csop-handoff/**',
    ],
    coverage: {
      provider: 'v8',
      reporter: ['text-summary', 'lcov', 'html'],
      reportsDirectory: 'coverage',
      // Measure the shipped product only; tests/tools/bench are the harness.
      include: ['src/**/*.{js,cjs,mjs}'],
      // No thresholds yet — reporting first, gate later.
    },
  },
});