chore: port clean script to node v10

scripts/clean.ts

@@ -9,4 +9,21 @@ import * as path from "path";
 const ROOT_DIR = path.resolve(__dirname, "..");
 const DIST_DIR = path.join(ROOT_DIR, "dist");
 
-fs.rmdirSync(DIST_DIR, { recursive: true });
+const rmdirRecursive = (dirPath: string): void => {
+    if (!fs.existsSync(dirPath)) {
+        return;
+    }
+    const entryNames = fs.readdirSync(dirPath);
+    for (const entryName of entryNames) {
+        const entryPath = path.join(dirPath, entryName);
+        const dirent = fs.lstatSync(entryPath);
+        if (dirent.isDirectory()) {
+            rmdirRecursive(entryPath);
+        } else {
+            fs.unlinkSync(entryPath);
+        }
+    }
+    fs.rmdirSync(dirPath);
+};
+
+rmdirRecursive(DIST_DIR);