Create new helper for validation

src/utils/validation.ts

@@ -0,0 +1,23 @@
+export function fileSizeValidation(stream?: any, maxSize?: number, callback?): Promise<any> {
+
+  return new Promise((resolve, reject) => {
+    let bytes=0;
+
+    stream.on("data", (chunk) => {
+      bytes += chunk.length;
+    });
+
+    stream.on("end", () => {
+      if (bytes > maxSize) {
+        reject(`File exceeds the maximum size ${maxSize}`);
+      } else {
+        resolve(bytes);
+      }
+    });
+
+    stream.on("error", (e) => {
+      reject(e);
+    });
+  });
+
+}