only watch src when running inside the monorepo

Author: erikthalen

packages/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@erikt/docgen",
-  "version": "0.0.4",
+  "version": "0.0.5",
   "type": "module",
   "bin": {
     "docgen": "./dist/bin.js"

packages/core/src/bin.ts

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 
 import { spawn } from "node:child_process";
+import { existsSync } from "node:fs";
 import { resolve } from "node:path";
 import { pathToFileURL } from "node:url";
 import { buildDocs } from "./index.js";
@@ -9,7 +10,9 @@ const command = process.argv[2];
 const configPath = resolve("docs.config.ts");
 
 if (command === "dev") {
-  spawn("node", ["--watch", "--watch-path=./pages", `--watch-path=${resolve(import.meta.dirname, "..", "src")}`, configPath], { stdio: "inherit" });
+  const coreSrc = resolve(import.meta.dirname, "..", "src");
+  const watchArgs = existsSync(coreSrc) ? [`--watch-path=${coreSrc}`] : [];
+  spawn("node", ["--watch", "--watch-path=./pages", ...watchArgs, configPath], { stdio: "inherit" });
 } else if (command === "build") {
   const { default: configPromise } = await import(pathToFileURL(configPath).href);
   const config = await configPromise;