It can remove the single and multiline comments from any JavaScript or node.js files

comment-remover.js

const fs = require("fs").promises;
const path = require("path");

// A class to remove all comments from a js file
class CommentRemover {
  // A constructor that takes a file name as an argument
  constructor(filePath) {
    // A property to store the file name
    this.filePath = filePath;
    // A property to store the file content
    this.fileContent = "";
    // A property to store the regular expression for matching comments and strings
    this.commentRegex = /\/\*[\s\S]*?\*\/|\/\/.*|"(?:\\.|[^"\\])*"|'(?:\\.|[^'\\])*'/g;
  }

  // A method to read the file content and store it in the fileContent property
  async readFile() {
    try {
      // Use the fs module to read the file asynchronously
      const contents = await fs.readFile(this.filePath, { encoding: 'utf8' });
      this.fileContent = contents;
    } catch (err) {
      // If there is an error, throw it
      console.error(err.message);
    }
  }

  // A method to remove all comments from the file content and return the result
  removeComments() {
    // Use the replace method with the commentRegex to replace all comments with an empty string
    return this.checkComments(this.fileContent);
  }

  // A function to iterate over the matches and check the groups
  checkComments(text) {
    var match;
    while (match = this.commentRegex.exec(text)) {
      if (match[0].startsWith("/*") || match[0].startsWith("//")) {
        text = text.replace(match[0], "");
      }
    }
    return text;
  };

  // A method to write the result to a new file with the same name but with a .clean.js extension
  async writeFile() {
    try {
      // Use the fs module to write the file asynchronously
      await fs.writeFile(this.filePath + ".clean.js", this.removeComments());
      // Otherwise, log a success message
      console.log("The file has been saved without comments!");
    } catch (err) {
      // If there is an error, throw it
      console.error(err.message);
    }
  }
}

// A function to print the help menu
function printHelp() {
  console.log("Usage: node script.js <filepath>");
  console.log("Options:");
  console.log("  -h, --help    Show this help message and exit");
}

async function main() {
  // Get the command line arguments
  let args = process.argv.slice(2);

  // If there is no argument or the argument is -h or --help, print the help menu and exit
  if (args.length === 0 || args[0] === "-h" || args[0] === "--help") {
    printHelp();
    process.exit(0);
  }

  // Otherwise, get the filePath from the first argument
  let filePath = args[0];

  // If the filepath is a relative path, resolve it from the current working directory
  if (!path.isAbsolute(filePath)) {
    filePath = path.resolve(process.cwd(), filePath);
  }

  // Do something with the filePath
  console.log("The filePath is " + filePath);

  // Create an instance of the CommentRemover class with a sample file name
  let remover = new CommentRemover(filePath);
  // Call the readFile method to read the file content
  await remover.readFile();
  // Call the writeFile method to write the result to a new file
  await remover.writeFile();
}

main();