Script for a cli tool that lets users generate a new package from an example package

generatePackage.js

const fs = require('fs');
const path = require('path');
const inquirer = require('inquirer');
const { exec } = require('child_process');

// Pull the arguments off of the command
let args = process.argv.slice(2);


// Write your own custom questions that the script will ask
const cliQuestions = [
  {
    type: 'input',
    name: 'description',
    message: 'What should the package.json description be?',
  },
  {
    type: 'input',
    name: 'version',
    message: 'What should the package.json version be?',
  },
];

// Find the path in the `/packages` directory where the package
// is going to live
const getPathToFile = packagesDir => {
  return fs
    .readdirSync(packagesDir)
    .map(filename => path.join(packagesDir, filename))
    .filter(filePath => filePath.includes('package.json'))[0];
};


// Update the example package's package.json file with the 
// user's responses to the cliQuestions
const editPackageJson = packageName => {
  inquirer.prompt(cliQuestions).then(answers => {
    const packagesDir = path.resolve(`./packages/${packageName}`);

    const content = {
      name: `@maecapozzi/${packageName}`,
      description: answers.description,
      version: answers.version,
    };

    const pathToFile = getPathToFile(packagesDir);

    const file = require(pathToFile);

    const editedFile = JSON.stringify(
      Object.assign(file, {
        ...content,
      })
    );

    return fs.writeFileSync(pathToFile, editedFile, err => {
      if (err) {
        console.error(err);
        return;
      }
      console.log('You successfully update the package.json file.');
    });
  });
};

const execute = packageName => {
  if (packageName[0] === undefined) {
    throw Error('Please provide a package name');
  }

  if (packageName.length > 1) {
    throw Error('Please only provide a single package name');
  }

  if (fs.existsSync(`./packages/${packageName[0]}`)) {
    throw Error('Please provide a package name that does not already exist');
  }

  // copy the example package to the new path
  exec(
    `cp -r ./examples/example-package ./packages/${packageName}`,
    (err, stdout, stderr) => {
      if (err) {
        throw err;
      }
      console.log(stdout);
      console.log(stderr);
      console.log(`${packageName} has been successfully created`);
      editPackageJson(packageName);
    }
  );
};

execute(args);