How to use the promise-polyfill.finally function in promise-polyfill
To help you get started, we’ve selected a few promise-polyfill examples, based on popular ways it is used in public projects.
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jefflau / jest-fetch-mock / src / index.js View on Github 
const crossFetch = require('cross-fetch')
global.fetch = crossFetch
global.Response = crossFetch.Response
global.Headers = crossFetch.Headers
global.Request = crossFetch.Request
if (!Promise) {
Promise = require('promise-polyfill')
} else if (!Promise.finally) {
Promise.finally = require('promise-polyfill').finally
}
const ActualResponse = Response
function responseWrapper(body, init) {
if (
body &&
typeof body.constructor === 'function' &&
body.constructor.__isFallback
) {
const response = new ActualResponse(null, init)
response.body = body
const actualClone = response.clone
response.clone = () => {const crossFetch = require('cross-fetch')
global.fetch = crossFetch
global.Response = crossFetch.Response
global.Headers = crossFetch.Headers
global.Request = crossFetch.Request
if (!Promise) {
Promise = require('promise-polyfill')
} else if (!Promise.finally) {
Promise.finally = require('promise-polyfill').finally
}
const ActualResponse = Response
function responseWrapper(body, init) {
if (
body &&
typeof body.constructor === 'function' &&
body.constructor.__isFallback
) {
const response = new ActualResponse(null, init)
response.body = body
const actualClone = response.clone
response.clone = () => {
const clone = actualClone.call(response)promise-polyfill
Lightweight promise polyfill. A+ compliant
