adfab-gulp-boilerplate/test-unit/helpers/pipe.js

Adfab's boilerplate. Helps you kick-start a front-end project within minutes.

'use strict'

const vs = require('vinyl-string')
const map = require('map-stream') // Lets us write in-line functions in our pipe

module.exports = function (input, path, lazypipe) {
  return new Promise((res, rej) => {
    let resultContent = false // So we can grab the content later

    const vFile = vs(input, { path }) // Equivalent to path: path. ES6 Object Literal Shorthand Syntax

    vFile
        .pipe(lazypipe()) // Call the function we're going to pass in
        .pipe(map((file, cb) => {
          resultContent = file
          cb(null, file)
        }))
        .on('error', e => {
          rej(e)
        })
        .on('end', () => {
          res(resultContent)
        })
  })
}