substance/util/async.js

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing system. It is developed to power our online editing platform [Substance](http://substance.io).

/*
  Run the functions in the tasks collection in series.

  NOTE: You can not access results of the executed functions
*/
export function series (tasks, cb, i) {
  i = i || 0
  tasks[i](function (err, ...args) {
    // Always stop execution on error
    if (err) return cb(err)
    if (i === tasks.length - 1) {
      cb(err, ...args) // we are done
    } else {
      series(tasks, cb, i + 1)
    }
  })
}