Update index.js

index.js

@@ -16,6 +16,19 @@ function hexFromBytes(arr) {
 	}
 }
 
+function base64FromBytes(arr) {
+	if (globalThis.Buffer) {
+		return globalThis.Buffer.from(arr).toString("base64");
+	} else {
+		const bin = [];
+		arr.forEach((byte) => {
+			bin.push(String.fromCharCode(byte));
+		});
+		return globalThis.btoa(bin.join(""));
+	}
+}
+
+
 
 /**
  * Use "Sign in with Hub" to authenticate a user, and get oauth user info / access token.