Simple cancellable GET request promise

cancellableGet.js

/**
 * GET request with a cancelable token
 * @param {string} url - url to request
 * @param {objecg} token - an object with a `cancel` function property.
 * @return {Promise}
 */
export function cancellableGet (url, token) {
  const xhr = new XMLHttpRequest()
  return new Promise(function (resolve, reject) {
    token.cancel = function () {
      xhr.abort()
      reject(`${url} has been cancelled!`)
    }

    xhr.onload = function(e) { resolve(xhr.responseText) }
    xhr.onerror = reject
    xhr.open('GET', url)
    xhr.send()
  })
}