nEngine/apps/editor/vite.config.ts

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

// The editor renderer is its own Vite app (root = apps/editor, own index.html).
// The main process loads the built renderer from dist/renderer/ over a local
// HTTP server (see src/main.ts), so no fs-shim middleware is needed here.
// `@nengine/core` aliases to source for dev/test speed; E1 used core TYPES only,
// E2 (map editing) also needs runtime `mapSchema`/`UNWALKABLE_TILES`. The full
// core barrel is NOT browser-safe (loader/mods import node:fs) — E2–E4 import it
// via two editor-only synthetic facets that alias core's PURE source modules
// (schema/ and systems/ — no node builtins): `@nengine/core-schema` and
// `@nengine/core-systems` (mirrored by "paths" in tsconfig.renderer.json). E5
// (playtest) brings the FULL `@nengine/core` barrel into the renderer and
// neutralizes its node:fs/node:path/node:url imports with the dev-app-proven
// in-memory shim aliases (src/shim/ — bundle mode performs ZERO fs calls at
// runtime, D30/D36, so the stubs are never invoked). `@nengine/render` (PixiJS
// viewport + connectLocal) is browser-safe and aliased to source like core.
// The node shim aliases are scoped to non-test builds: vitest (mode "test")
// runs in Node where the real `node:*` builtins must stay intact (tests use
// mkdtemp/writeFile on real tmp dirs).
export default defineConfig(({ mode }) => {
  const shimAliases = mode === "test" ? {} : {
    "node:fs/promises": fileURLToPath(new URL("./src/shim/fs-promises.ts", import.meta.url)),
    "node:fs": fileURLToPath(new URL("./src/shim/fs.ts", import.meta.url)),
    "node:path": fileURLToPath(new URL("./src/shim/path.ts", import.meta.url)),
    "node:url": fileURLToPath(new URL("./src/shim/url.ts", import.meta.url)),
  };
  return {
    root: fileURLToPath(new URL(".", import.meta.url)),
    resolve: {
      alias: {
        "@nengine/core": fileURLToPath(new URL("../../packages/core/src/index.ts", import.meta.url)),
        "@nengine/render": fileURLToPath(new URL("../../packages/render/src/index.ts", import.meta.url)),
        "@nengine/core-schema": fileURLToPath(new URL("../../packages/core/src/schema/index.ts", import.meta.url)),
        "@nengine/core-systems": fileURLToPath(new URL("../../packages/core/src/systems/index.ts", import.meta.url)),
        ...shimAliases,
      },
    },
    build: {
      outDir: "dist/renderer",
      emptyOutDir: true,
      rollupOptions: {
        input: fileURLToPath(new URL("./index.html", import.meta.url)),
      },
    },
    test: {
      include: ["test/**/*.test.ts"],
      environment: "node",
    },
  };
});