Implement new GC API & rename to zipUtils

src/utils/string.ts

@@ -8,4 +8,8 @@ export function byteToString(bytes: number) {
   const i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)).toString(), 10)
   if (i === 0) return `${bytes} ${sizes[i]}`
   return `${(bytes / Math.pow(1024, i)).toFixed(2)} ${sizes[i]}`
+}
+
+export function base64Decode(str: string) {
+  return Buffer.from(str, 'base64').toString('utf8')
 }