whilething.js

const path = require('path')
const { readFile, writeFile } = require('fs').promises
const glob = require('fast-glob')
const mjml2html = require('mjml')
const outputExtension = 'hbs'
async function start () {
  // Todo: clear  emails before
  const templates = await glob('./src/emails/**/*.mjml')
  try {
    const compiledTemplates = await Promise.all(
      templates.map(template => {
        return readFile(template, { encoding: 'utf-8' }).then(html => {
          const extension = path.extname(template)
          return {
            name: path.basename(template, extension),
            html: mjml2html(html, { beautify: true }).html
          }
        })
      })
    )

    await Promise.all(
      compiledTemplates.map(template => {
        const outputPath = path.join(
          __dirname,
          'src',
          'server',
          'emails',
          `${template.name}.${outputExtension}`
        )

        return writeFile(outputPath, template.html)
      })
    )
    console.log('Building Emails done')
  } catch (error) {
    console.log('Building Failed!', error)
  }
}

start()