save-file.js

const fs = require('fs')
const path = require('path')

const saveToFile = (entry) => {
  
  const target = path.join(__dirname, 'did.txt')
  
  console.log(chalk.green(`... saving to did.txt`))
  
  if (fs.existsSync(target)) {
    // if the file exists, we will append to the existing file
    
    return fs.appendFileSync(target, '\n\n' + entry);
  }
  else {
    // if the file doesn't exist, we will write to a new file
    
    return fs.writeFileSync(target, entry);
  }
}