hack - add btoa

Author: veronicaz41

package-lock.json

@@ -32,6 +32,7 @@
   },
   "homepage": "https://github.com/iden3/ffjs#readme",
   "dependencies": {
+    "abab": "^2.0.5",
     "big-integer": "^1.6.48",
     "wasmbuilder": "^0.0.12",
     "wasmcurves": "0.1.0",

package.json

@@ -24,6 +24,7 @@ const MEM_SIZE = 25;  // Memory size in 64K Pakes (1600Kb)
 
 import thread from "./threadman_thread.js";
 import os from "os";
+import abab from "abab";
 
 /*#if _SES
 //#else */
@@ -45,7 +46,7 @@ function sleep(ms) {
 
 function stringToBase64(str) {
     if (process.browser) {
-        return globalThis.btoa(str);
+        return abab.btoa(str);
     } else {
         return Buffer.from(str).toString("base64");
     }