IE11 'Promise' is not defined

Escobar · March 24, 2020, 5:20pm

I know that IE11 is an old monster and nobody should use it but at the end of the day there are some people playing with it yet.

I’ve tried to call some scripts like
<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>

before including the Babylon scripts but without luck.

Anyway shouldn’t Babylon manage this without any additional code?

Thank you in advance!

Deltakosh · March 24, 2020, 5:37pm

Promise is already handled by babylon.js:

github.com

BabylonJS/Babylon.js/blob/master/src/Misc/promise.ts

import { Nullable } from "../types";

enum PromiseStates {
    Pending,
    Fulfilled,
    Rejected
}

class FulFillmentAgregator<T> {
    public count = 0;
    public target = 0;
    public rootPromise: InternalPromise<T>;
    public results: any[] = [];
}

class InternalPromise<T> {
    private _state = PromiseStates.Pending;
    private _resultValue?: Nullable<T>;
    private _reason: any;
    private _children = new Array<InternalPromise<T>>();

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Escobar · March 24, 2020, 6:55pm

Here is my minimal reproducible example:
http://www.motivacg.com/temporal/babylonbug/indexbug.html

(you’ll need internet explorer 11)

Deltakosh · March 24, 2020, 7:10pm

Gotcha! This is because of the Draco compressor which is using WebWorker (where the promise polyfill is not supported)

Let me ask @bghgary to see if we can disable webworkers for Draco decompression

bghgary · March 24, 2020, 7:40pm

That’s a bummer. I wonder if we can load our promise polyfill in the web worker. For now, you can disable Draco compression from running in a web worker by doing something like this:

BABYLON.DracoCompression.DefaultNumWorkers = 0;

Escobar · March 25, 2020, 8:40am

unfortunately, after using DefaultNumWorkers = 0, now it triggers:

BJS - [09:37:38]: Unable to load from ./mesh.glb: /meshes/0/primitives/0: undefined

www.motivacg.com/temporal/babylonbug/indexbug2.html

RaananW · March 25, 2020, 10:34am

I guess any polyfill with self reference instead of window will do (for example promise-polyfill/polyfill.js at master · taylorhakes/promise-polyfill · GitHub) .
Adding this kind of global object detection method (self->window->global) to the PromisePolyfill.Apply method (in BJS) will allow you to use this polyfill in webworkers as well (not tested, just a thought )

bghgary · March 25, 2020, 8:33pm

I was getting that error before I suggested the DefaultNumWorkers, so unless you added that before I posted the reply, then it’s probably unrelated.

bghgary · April 6, 2020, 9:40pm

See if the model is compressed， it does not work in IE11 browser · Issue #7987 · BabylonJS/Babylon.js · GitHub for the current status of IE11 support for Draco.

Matthew_Blackwood · April 7, 2020, 6:43pm

I just noticed this thread, it appears the fix that was done here broke all my code (possibly b/c of my poor coding skills ), I started another thread about it but it looks like the cdn/stable version of Babylon.js references the preview versions of these draco decoder files

bghgary · April 9, 2020, 6:52pm

We resolved the issue you were having in the other thread which seems to be a caching issue.

The support for Draco in IE11 is now ready.

Matthew_Blackwood · April 11, 2020, 1:06pm

I was actually having problems with clients not able to access using IE 11 so I appreciate this fix

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How to use BABYLON.WorkerPool? Questions	2	515	April 9, 2019
Setting the value 0 to the DefaultNumWorkers from DracoCompression throw an Engine error since 6.21.1 version Bugs	16	371	September 26, 2023
BABYLON.Tools.DumpFramebuffer returns a promise in playground, but void in a real deploy? Questions	6	491	April 3, 2021
Cannot import DRACO compressed mesh in a Web Worker Bugs	8	451	November 19, 2021

IE11 'Promise' is not defined

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