frontend/builder.js

module.exports = function build(path, data) {
  console.log("Building", path)

  return new Promise((resolve, reject) => {
    const render = require(path).render(data)
    render.once("error", err => reject)

    const interval = setInterval(() => {
      if (render._remaining === 0) {
        clearInterval(interval)
        resolve()
      }
    }, 500)
  })
}