yaak-mountain-loop/packages/common-lib/formatSize.ts

export function formatSize(bytes: number): string {
  let num: number;
  let unit: string;

  if (bytes > 1000 * 1000 * 1000) {
    num = bytes / 1000 / 1000 / 1000;
    unit = "GB";
  } else if (bytes > 1000 * 1000) {
    num = bytes / 1000 / 1000;
    unit = "MB";
  } else if (bytes > 1000) {
    num = bytes / 1000;
    unit = "KB";
  } else {
    num = bytes;
    unit = "B";
  }

  return `${Math.round(num * 10) / 10} ${unit}`;
}