refactor(server): folder structure (#5573)

packages/backend/server/src/prelude.ts

@@ -1,8 +1,43 @@
 import 'reflect-metadata';
-import './affine.env';
-import './affine';
-import './affine.config';
 
-if (process.env.NODE_ENV === 'development') {
-  console.log('AFFiNE Config:', globalThis.AFFiNE);
+import { join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { config } from 'dotenv';
+
+import {
+  applyEnvToConfig,
+  getDefaultAFFiNEConfig,
+} from './fundamentals/config';
+
+async function load() {
+  // Initializing AFFiNE config
+  //
+  // 1. load dotenv file to `process.env`
+  // load `.env` under pwd
+  config();
+  // load `.env` under user config folder
+  config({
+    path: join(fileURLToPath(import.meta.url), '../config/.env'),
+  });
+
+  // 2. generate AFFiNE default config and assign to `globalThis.AFFiNE`
+  globalThis.AFFiNE = getDefaultAFFiNEConfig();
+
+  // TODO(@forehalo):
+  //   Modules may contribute to ENV_MAP, figure out a good way to involve them instead of hardcoding in `./config/affine.env`
+  // 3. load env => config map to `globalThis.AFFiNE.ENV_MAP
+  await import('./config/affine.env');
+
+  // 4. apply `process.env` map overriding to `globalThis.AFFiNE`
+  applyEnvToConfig(globalThis.AFFiNE);
+
+  // 5. load `./config/affine` to patch custom configs
+  await import('./config/affine');
+
+  if (process.env.NODE_ENV === 'development') {
+    console.log('AFFiNE Config:', JSON.stringify(globalThis.AFFiNE, null, 2));
+  }
 }
+
+await load();