refactor(build): bundle backend for pkg-compatible esm source

Author: GhostTypes

package-lock.json

@@ -11,14 +11,14 @@
     "start:dev": "nodemon --watch src --ext ts --exec \"node dist/index.js\"",
     "build": "npm run build:backend && npm run build:webui",
     "build:watch": "concurrently \"npm run build:backend:watch\" \"npm run build:webui:watch\"",
-    "build:backend": "tsc",
-    "build:backend:watch": "tsc --watch",
+    "build:backend": "tsx scripts/build-backend.ts",
+    "build:backend:watch": "tsx scripts/build-backend.ts --watch",
     "build:webui": "tsc --project src/webui/static/tsconfig.json && npm run build:webui:copy",
     "build:webui:watch": "tsc --project src/webui/static/tsconfig.json --watch",
     "build:webui:copy": "node scripts/copy-webui-assets.js",
     "build:linux": "npm run build && pkg . --targets node20-linux-x64 --output dist/flashforge-webui-linux-x64",
     "build:linux-arm": "npm run build && pkg . --targets node20-linux-arm64 --output dist/flashforge-webui-linux-arm64",
-    "build:linux-armv7": "npm run build && pkg . --targets node20.19.5-linux-armv7 --output dist/flashforge-webui-linux-armv7",
+    "build:linux-armv7": "npm run build && pkg . --targets node20-linuxstatic-armv7 --output dist/flashforge-webui-linux-armv7",
     "build:win": "npm run build && pkg . --targets node20-win-x64 --output dist/flashforge-webui-win-x64.exe",
     "build:mac": "npm run build && pkg . --targets node20-macos-x64 --output dist/flashforge-webui-macos-x64",
     "build:mac-arm": "npm run build && pkg . --targets node20-macos-arm64 --output dist/flashforge-webui-macos-arm64",
@@ -76,6 +76,7 @@
     "@types/ws": "^8.5.13",
     "@yao-pkg/pkg": "^5.15.0",
     "concurrently": "^9.1.2",
+    "esbuild": "^0.27.3",
     "jest": "^30.2.0",
     "nodemon": "^3.1.11",
     "rimraf": "^6.0.1",

package.json

@@ -0,0 +1,73 @@
+import { type BuildOptions, build, context } from 'esbuild';
+import * as fs from 'fs/promises';
+import * as path from 'path';
+
+const DIST_DIR = path.join(process.cwd(), 'dist');
+const OUTFILE = path.join(DIST_DIR, 'index.js');
+const WATCH_FLAG = '--watch';
+
+const buildOptions: BuildOptions = {
+  entryPoints: ['src/index.ts'],
+  outfile: OUTFILE,
+  bundle: true,
+  charset: 'utf8',
+  format: 'cjs',
+  keepNames: true,
+  legalComments: 'none',
+  logLevel: 'info',
+  packages: 'external',
+  platform: 'node',
+  sourcemap: true,
+  target: ['node20'],
+  treeShaking: false,
+  tsconfig: 'tsconfig.json',
+};
+
+async function ensureDistDirectory(): Promise<void> {
+  await fs.mkdir(DIST_DIR, { recursive: true });
+}
+
+async function runBuild(): Promise<void> {
+  await ensureDistDirectory();
+  await build(buildOptions);
+}
+
+async function runWatch(): Promise<void> {
+  await ensureDistDirectory();
+
+  const buildContext = await context(buildOptions);
+
+  const shutdown = async (): Promise<void> => {
+    await buildContext.dispose();
+    process.exit(0);
+  };
+
+  process.on('SIGINT', () => {
+    void shutdown();
+  });
+  process.on('SIGTERM', () => {
+    void shutdown();
+  });
+
+  await buildContext.watch();
+  process.stdout.write('[build-backend] Watching for backend changes...\n');
+
+  await new Promise(() => {
+    // Keep the process alive while esbuild runs in watch mode.
+  });
+}
+
+async function main(): Promise<void> {
+  if (process.argv.includes(WATCH_FLAG)) {
+    await runWatch();
+    return;
+  }
+
+  await runBuild();
+}
+
+void main().catch((error) => {
+  const message = error instanceof Error ? (error.stack ?? error.message) : String(error);
+  process.stderr.write(`${message}\n`);
+  process.exit(1);
+});