import fs from 'node:fs/promises';
import path from 'node:path';

export async function readJson(file, fallback = null) {
  try {
    return JSON.parse(await fs.readFile(file, 'utf8'));
  } catch {
    return fallback;
  }
}

export async function writeJson(file, data) {
  await fs.mkdir(path.dirname(file), { recursive: true });
  const tmp = `${file}.tmp`;
  await fs.writeFile(tmp, JSON.stringify(data, null, 2));
  await fs.rename(tmp, file); // atomic replace
}