add clean to build

local/rollup/src/plugins/clean.js

@@ -0,0 +1,24 @@
+const path = require('path');
+const fs = require('fs');
+
+module.exports = ({ paths = [], verbose = false } = {}) => {
+  let cleaned = false;
+  return {
+    name: 'clean',
+    async buildStart() {
+      if (!cleaned) {
+        paths.forEach((currPath) => {
+          const resolvedPath = path.resolve(currPath);
+          if (fs.existsSync(resolvedPath)) {
+            if (verbose) {
+              // eslint-disable-next-line no-console
+              console.log(`Clean: ${resolvedPath}`);
+            }
+            fs.rmSync(resolvedPath, { recursive: true });
+          }
+        });
+        cleaned = true;
+      }
+    },
+  };
+};