import { fileURLToPath } from "node:url";
import { defineConfig } from "vitest/config";

/**
 * `.mts` rather than `.ts`: this package is CommonJS (the Vicinae toolchain
 * compiles extensions with `module: commonjs`), and Vite warns when an ESM
 * config is loaded as CJS. The extension lets us write the config as ESM.
 */
export default defineConfig({
  test: {
    globals: true,
    include: ["src/__tests__/**/*.test.ts"],
    /**
     * One file at a time.
     *
     * The retention and snip tests exercise the real file system, and the snip
     * directory is a single fixed path taken from the stubbed `environment`
     * (`/tmp/lam-agent-support/snips`). Two files running at once would each
     * clear and repopulate the other's directory mid-test, so files are run
     * sequentially rather than giving every file its own path to reason about.
     * The whole suite is well under a second either way.
     */
    fileParallelism: false,
  },
  resolve: {
    alias: {
      // Point the API package at the in-memory stub; there is no Vicinae
      // runtime under test.
      "@vicinae/api": fileURLToPath(new URL("./src/__mocks__/@vicinae/api.ts", import.meta.url)),
    },
  },
});