runStep.js

runStep.js

export function runSteps (arr) {
  if (arr.length === 0) {
    return
  }
  return arr.reduce(function(promise, item) {
    return promise.then(createStep(item))
  }, Promise.resolve([]))
}
function createStep ({ step, timeout }) {
  return new Promise(function (resolve, reject) {
    setTimeout(function () {
      try {
        resolve(step())
      } catch (err) {
        reject(err)
      }
    }, timeout || 0)
  })
}