Count files and lines

index.js

const fs = require("fs");
const readline = require('readline');

/**
 *
 * @param folderPath
 * @param extensions
 * @returns {boolean}
 */
const countFilesAndLines = async (folderPath, extensions) => {
  let files = 0;
  let lines = 0;
  const doRead = (_file) => {
    let lineCount = 0;
    return new Promise((resolve) => {
      const inf = readline.createInterface({
        input: fs.createReadStream(_file),
        crlfDelay: Infinity
      });
      inf.on('line', (line) => {
        if(line.trim()?.length) {
          lineCount += 1;
        }
      });
      inf.on('close', () => resolve(lineCount));
    });
  }
  const counter = async(_path) => {
    try {
      await Promise.all(fs
        .readdirSync(_path, { withFileTypes: true })
        .map(async (subDir) => {
          const extension = subDir.name.split('.').pop();
          if(subDir.isFile() && extensions.indexOf(extension) > -1){
            const t = await doRead(`${_path}/${subDir.name}`);
            lines += t;
            files += 1;
          } else if(subDir.isDirectory()){
            const subPath = `${_path}/${subDir.name}`;
            await counter(subPath);
          }
        }));
    } catch (err) {
      console.warn(err);
    }
  }
  await counter(folderPath);
  return {files, lines};
};

/* countFilesAndLines('/root/pathto/Work/some/directory', ['ts', 'tsx', 'txt', 'js', 'jsx']).then((result) => {
  console.warn(`result ${JSON.stringify(result)}`);
}); */