import { fileURLToPath, URL } from "node:url";
import { defineConfig } from "vite";

// The sandboxed preload must be a single self-contained CJS file — Electron's
// sandbox require polyfill cannot resolve relative modules ("a bundler is
// required if you need to split preload code into multiple files"). tsc.preload
// type-checks (noEmit); this config bundles src/preload.ts + the shared ipc.ts
// channel constants into one dist/preload/preload.js with electron external.
export default defineConfig({
  build: {
    outDir: "dist/preload",
    emptyOutDir: true,
    lib: {
      entry: fileURLToPath(new URL("./src/preload.ts", import.meta.url)),
      formats: ["cjs"],
      fileName: () => "preload.js",
    },
    rollupOptions: {
      external: ["electron"],
    },
  },
});