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Add Promise finally method to polyfill

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This commit is contained in:
spacejack 2018-02-18 20:18:13 -05:00
parent 1410e35456
commit f99b804f5b
2 changed files with 43 additions and 2 deletions
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26
promise/promise.js
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@ -61,6 +61,20 @@ PromisePolyfill.prototype.then = function(onFulfilled, onRejection) {
PromisePolyfill.prototype.catch = function(onRejection) {
return this.then(null, onRejection)
}
PromisePolyfill.prototype.finally = function(callback) {
return this.then(
function(value) {
return PromisePolyfill.resolve(callback()).then(function() {
return value
})
},
function(reason) {
return PromisePolyfill.resolve(callback()).then(function() {
return PromisePolyfill.reject(reason);
})
}
)
}
PromisePolyfill.resolve = function(value) {
if (value instanceof PromisePolyfill) return value
return new PromisePolyfill(function(resolve) {resolve(value)})
@ -96,10 +110,18 @@ PromisePolyfill.race = function(list) {
}
if (typeof window !== "undefined") {
if (typeof window.Promise === "undefined") window.Promise = PromisePolyfill
if (typeof window.Promise === "undefined") {
window.Promise = PromisePolyfill
} else if (!window.Promise.prototype.finally) {
window.Promise.prototype.finally = PromisePolyfill.prototype.finally
}
module.exports = window.Promise
} else if (typeof global !== "undefined") {
if (typeof global.Promise === "undefined") global.Promise = PromisePolyfill
if (typeof global.Promise === "undefined") {
global.Promise = PromisePolyfill
} else if (!global.Promise.prototype.finally) {
global.Promise.prototype.finally = PromisePolyfill.prototype.finally
}
module.exports = global.Promise
} else {
module.exports = PromisePolyfill