Read a file, skip every second line, write file (when copying code with line numbers)

parse.js

const fs = require('fs')
const { join } = require('path')

function parse(file) {
  const path = join(process.env.PWD, 'test', 'fixtures', file)
  const content = fs.readFileSync(path, 'utf8')
  const lines = content.split('\n')
  let data = ''
  let stringified = 'data = '
  lines.forEach((line, idx) => {
    if (!(idx % 2)) {
      stringified += line
    }
  })
  eval(stringified)
  let template = 'module.exports = exports = '
  template += JSON.stringify(data, null, 2)
  fs.writeFileSync(`${path}.js`, template, 'utf8')
}

const file = process.argv[2]
parse(file)