simple-review-server/src/utils/functions.ts

import fs from "fs";
import { Review } from "../types";

export function checkFile(file: string, encoding: fs.EncodingOption): Review[] {
  const dir = "./persist/";
  const fullPath = dir + file;
  let final: Review[];

  if (fs.existsSync(dir)) {
    const data = fs.readFileSync(fullPath, encoding);

    final = !data.toString().trim() ? [] : JSON.parse(data.toString());
  } else {
    fs.mkdirSync(dir);
    fs.createWriteStream(fullPath);
    final = [];
  }

  return final;
}