all these changes

frontend/node_modules/btoa/index.js

@@ -0,0 +1,17 @@
+(function () {
+  "use strict";
+
+  function btoa(str) {
+    var buffer;
+
+    if (str instanceof Buffer) {
+      buffer = str;
+    } else {
+      buffer = Buffer.from(str.toString(), 'binary');
+    }
+
+    return buffer.toString('base64');
+  }
+
+  module.exports = btoa;
+}());