long.ts

const thirtyTwo = BigInt(32);
const mask = BigInt(0xffffffff);

class Long implements Long.Long {
  public low = 0;
  public high = 0;
  public readonly unsigned = true;

  constructor(low: number | bigint | string, high = 0, unsigned = true) {
    if (!unsigned) throw new Error('signed longs unsupported');
    try {
      if (typeof low === 'string') {
        low = BigInt(low);
      }
      if (typeof low === 'number') {
        this.low = low;
        this.high = high;
      } else if (typeof low === 'bigint') {
        this.high = Number(low >> thirtyTwo);
        this.low = Number(low & ~(mask << thirtyTwo));
        if (this.low > 0) this.low = -(~this.low + 1);
        if (this.high > 0) this.high = -(~this.high + 1);
      }
    } catch {}
  }

  get bigint(): bigint {
    const low = this.low >>> 0;
    const high = this.high >>> 0;

    return (BigInt(high) << thirtyTwo) + BigInt(low);
  }

  static get ZERO(): Long {
    return new Long(0);
  }

  toString(): string {
    return this.bigint.toString();
  }
}