lineCounter.js

import fs from "fs";

(async () => {
  let files = [];
  let lineCount = 0;
  const directoryPath = ".";
  const fileType = "csv";

  try {
    const fileNames = fs.readdirSync(directoryPath);
    fileNames.forEach((fileName) => {
      const lastThree = fileName.substring(fileName.length - fileType.length);
      if (lastThree === fileType) {
        files.push(fileName);
      }
    });
  } catch (e) {
    console.error({ e });
  }
  console.log({ files });

  files.forEach((filePath) => {
    const csvString = fs.readFileSync(filePath, "utf8");
    const lines = csvString.split("\n");
    lineCount += lines.length;
  });

  console.log(`Total line count: ${lineCount}`);
})();