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

export default defineConfig({
  test: {
    globals: false,
    setupFiles: ["./tests/setup.ts"],
    restoreMocks: true,
    clearMocks: true,
    mockReset: true,
    testTimeout: 10_000,
    // A runaway serialization inside a worker (the classic case: an assertion
    // library inspecting a React-rendered DOM node, whose `__reactFiber$*`
    // graph re-expands per traversal path) allocates until the machine's OOM
    // killer takes the whole run down -- 29.5GB and ~40s here, reported as a
    // bare "worker exited" with no failing test named. Capping the worker's
    // old-space turns that into a `Reached heap limit` abort in ~3s, next to
    // the file that caused it. The ceiling is chosen well above real demand:
    // the heaviest suite (`tests/unit`, 126 files) peaks near 1.3GB RSS, of
    // which old-space is only a fraction.
    execArgv: ["--max-old-space-size=2048"],
    exclude: [
      ...configDefaults.exclude,
      ".tmp/**",
      // A git worktree inside the repository is a different checkout of a
      // different branch. Running its tests against this checkout's config
      // reports failures that belong to neither.
      ".worktrees/**",
      "tests/fixtures/v8-coverage-counter-semantics/**",
    ],
    coverage: {
      provider: "v8",
      reportsDirectory: "artifacts/tests/coverage",
      reporter: ["text", "json-summary", "lcov"],
      include: ["src/**/*.{ts,tsx}"],
      exclude: ["**/*.d.ts", "**/*.stories.*"],
    },
  },
});