message: build error fix
diff: @@ -241,7 +241,7 @@ export class BigInt {
  pow(exponent: u64): BigInt {
  let res: BigInt = this.copy();
  - for (let i = 1; i < exponent; i++) {
  + for (let i: u64 = 1; i < exponent; i++) {
  res = res.mul(res);
  }
  return res;
  