From d493e00a674a9d3a0f90bd2edd38803f74b36928 Mon Sep 17 00:00:00 2001
From: Salakar <mike.diarmid@gmail.com>
Date: Thu, 3 May 2018 21:50:53 +0100
Subject: [PATCH] [firestore][js] additional Blob class input arg validations

---
 lib/modules/firestore/Blob.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/modules/firestore/Blob.js b/lib/modules/firestore/Blob.js
index 3d8149e9..6f4f5bb9 100644
--- a/lib/modules/firestore/Blob.js
+++ b/lib/modules/firestore/Blob.js
@@ -14,6 +14,12 @@ export default class Blob {
    * @param base64 string
    */
   static fromBase64String(base64: string): Blob {
+    if (typeof base64 !== 'string' || base64.length < 1) {
+      throw new Error(
+        'firestore.Blob.fromBase64String expects a string of at least 1 character in length'
+      );
+    }
+
     return new Blob(Base64.atob(base64));
   }