Byte.ts

export class Byte {
  static readonly units = {
    terabyte: 2 ** 40,
    gigabyte: 2 ** 30,
    megabyte: 2 ** 20,
    kilobyte: 2 ** 10,
  };

  private unit = "byte";
  private divisor = 1;
  private formatter: Intl.NumberFormat;

  constructor(readonly value: number) {
    for (const [unit, divisor] of Object.entries(Byte.units)) {
      if (this.value >= divisor) {
        this.unit = unit;
        this.divisor = divisor;
        break;
      }
    }

    this.formatter = new Intl.NumberFormat("en", {
      notation: "compact",
      style: "unit",
      unit: this.unit,
      unitDisplay: "narrow",
    });
  }

  static format(value: number | null): string {
    if (value == null) {
      return "";
    }

    return new this(value).format();
  }

  format() {
    return this.formatter.format(this.value / this.divisor);
  }

  toString() {
    return this.format();
  }
}

Byte.format(4_194_304);