diff --git a/package.json b/package.json
index f30e3f0..501aa78 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   "scripts": {
     "typecheck": "tsc",
     "start": "node src/server.ts",
-    "dev": "node --watch-path=./src --watch-path=./sdk --watch-path=./sources --watch --watch-preserve-output src/server.ts",
+    "dev": "node scripts/dev.mjs",
     "test": "pnpm run typecheck && node test/source-simple-test.ts && node test/smoke-test.ts"
   },
   "dependencies": {
diff --git a/scripts/dev.mjs b/scripts/dev.mjs
new file mode 100644
index 0000000..23a5240
--- /dev/null
+++ b/scripts/dev.mjs
@@ -0,0 +1,29 @@
+// pnpm dev 的包装：node --watch-path 指向不存在的目录会直接 ENOENT 崩溃。
+// sources/ 不入库（第三方音源脚本，gitignore 整目录），新 clone 的仓库里没有它，
+// 所以这里只为实际存在的目录注册 watch。
+import { existsSync } from 'node:fs'
+import { spawn } from 'node:child_process'
+import { dirname, join, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), '..')
+
+const watchTargets = ['src', 'sdk', 'sources']
+  .map((dir) => join(root, dir))
+  .filter((dir) => existsSync(dir))
+
+const child = spawn(
+  process.execPath,
+  [
+    ...watchTargets.flatMap((dir) => ['--watch-path', dir]),
+    '--watch',
+    '--watch-preserve-output',
+    join(root, 'src/server.ts'),
+  ],
+  { stdio: 'inherit', cwd: root },
+)
+
+child.on('exit', (code, signal) => {
+  if (signal) process.kill(process.pid, signal)
+  else process.exit(code ?? 1)
+})