Getting "Finally is not a function" in bluebird, why?

Question

I have included Bluebird like so...

<script src="../../js/libs/bluebird.min.js" type="text/javascript"></script>

When I run the following code...

requestEvent(request, src)

        .then(function (response) {

            ...
        })
        .finally(function () {

            ...
        });

function requestEvent(request, src) {

    return new Promise(function (resolve, reject) {

        $.ajax({
            url: 'mywebsite',
            type: "POST",
            success: function (response) {

                if (response.status == 0) {

                    reject(response.message);
                }

                resolve(response);
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {

                reject(XMLHttpRequest.responseText);
            }
        });
    });
}

I get...

TypeError: requestEvent(...).then(...).finally is not a function

Why does finally not exist?

This is client/browser code.

It feels that you didn't use `installation` section from the docs, and using native `Promise` on instead of bluebird. Have you done [this](http://bluebirdjs.com/docs/install.html#browserify-and-webpack)? — Andrey, Sep 22 '17 at 14:44
Check your script path, I tested and it works fine, check this out https://jsbin.com/labixiwiru/edit?html,js,console,output — AngelSalazar, Sep 22 '17 at 14:48
I have two pages and was testing it from the one without a script reference. — Ian Warburton, Sep 22 '17 at 14:51
I'd suggest you delete your question since it is no longer on-topic for stack overflow and there is no reason for people to read and try to answer the question. Deleting it will also avoid an accumulation of downvotes. — jfriend00, Sep 22 '17 at 17:21
Not all browsers support the Promise.prototype.finally() method. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/finally — vivanov, Feb 11 '18 at 19:03
need to add `const Promise = require("bluebird")` at top of code to use bluebird Promise instead of default one. — azhar22k, Apr 02 '18 at 05:51
Do not delete this question, it was the top google hit and help resolve my issue. — Aaron McMillin, Jul 04 '18 at 15:43

Temani Afif · Answer 1 · 2018-04-20T19:01:53.013

3

~~finally() is not a function for a promise~~

~~Read this : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise~~

You need to check if the path of bluebird is correct or not.

Update 2018: .finally() is now (TC39 stage 4; finished) part of the official specification now as you can see in the same link above or in this specific page. However not many browsers support it yet.

edited Apr 20 '18 at 19:01

answered Sep 22 '17 at 14:42

Temani Afif

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I'm trying to use Bluebird not native. – Ian Warburton Sep 22 '17 at 14:43
but in your code you're using native Promise and i replied to your question : Why does finally not exist? – Temani Afif Sep 22 '17 at 14:46
So how do I use the Bluebird promise instead of native? – Ian Warburton Sep 22 '17 at 14:46
your tried somethin like this **var Promise = require("bluebird");** – Temani Afif Sep 22 '17 at 14:48
@MikaelLennholm Why didn't you read the question more closely :P? – Andrew Li Sep 22 '17 at 15:22
I'm having the same problem. The docs say that finally() is a function of Promise.prototype. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/finally – Lawrence I. Siden Apr 20 '18 at 18:47
1

@LawrenceI.Siden yes true, i have updated the answer ;) as when posted finally was not a function of promise – Temani Afif Apr 20 '18 at 18:53

Getting "Finally is not a function" in bluebird, why?

1 Answers1