Pull LKG script change from other branch

Author: jakebailey

scripts/produceLKG.mjs

@@ -3,6 +3,7 @@ import fs from "fs-extra";
 import path from "path";
 import glob from "glob";
 import url from "url";
+import * as del from "del";
 
 const __filename = url.fileURLToPath(new URL(import.meta.url));
 const __dirname = path.dirname(__filename);
@@ -13,6 +14,8 @@ const dest = path.join(root, "lib");
 
 async function produceLKG() {
     console.log(`Building LKG from ${source} to ${dest}`);
+    await del(`${dest.replace(/\\/g, "/")}/**`, { ignore: ["**/README.md"] });
+    await fs.mkdirp(dest);
     await copyLibFiles();
     await copyLocalizedDiagnostics();
     await copyTypesMap();