big-int-stats/src/toStats.ts

Create BigIntStats from fs.Stats for compatiblity on earlier versions of Node.js

import type { BigIntStats, Stats, StatsBase } from 'fs';
import fs from 'fs';
import JSBI from 'jsbi-compat';

const kNsPerMsBigInt = JSBI.BigInt(10 ** 6);

import type { AnyStats } from './types.ts';

export default function toStats(stats: AnyStats): Stats {
  if (typeof (stats as StatsBase<number>).dev !== 'bigint') return stats as Stats;

  const bigStats = stats as BigIntStats;
  // @ts-ignore
  return new fs.Stats(
    Number(bigStats.dev),
    Number(bigStats.mode),
    Number(bigStats.nlink),
    Number(bigStats.uid),
    Number(bigStats.gid),
    Number(bigStats.rdev),
    Number(bigStats.blksize),
    Number(bigStats.ino),
    Number(bigStats.size),
    Number(bigStats.blocks),
    Number(bigStats.atimeNs ? JSBI.divide(bigStats.atimeNs, kNsPerMsBigInt) : bigStats.atimeMs),
    Number(bigStats.mtimeNs ? JSBI.divide(bigStats.mtimeNs, kNsPerMsBigInt) : bigStats.mtimeMs),
    Number(bigStats.ctimeNs ? JSBI.divide(bigStats.ctimeNs, kNsPerMsBigInt) : bigStats.ctimeMs),
    Number(bigStats.birthtimeNs ? JSBI.divide(bigStats.birthtimeNs, kNsPerMsBigInt) : bigStats.birthtimeMs)
  );
}