Here are the entries in Window.idl:

    // Images
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLImageElement image, ImageBitmapCall
back callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLImageElement image, ImageBitmapCall
back callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLVideoElement video, ImageBitmapCall
back callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLVideoElement video, ImageBitmapCall
back callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(CanvasRenderingContext2D context, Image
BitmapCallback callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(CanvasRenderingContext2D context, Image
BitmapCallback callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLCanvasElement canvas, ImageBitmapCa
llback callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLCanvasElement canvas, ImageBitmapCa
llback callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageData data, ImageBitmapCallback cal
lback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageData data, ImageBitmapCallback cal
lback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageBitmap bitmap, ImageBitmapCallback
 callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageBitmap bitmap, ImageBitmapCallback
 callback, long sx, long sy, long sw, long sh);

Added this to the Later milestone.

Removed Area-HTML label.
Added Area-Library, Library-Html labels.

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

Removed Oldschool-Milestone-Later label.

Removed Priority-Unassigned label.
Added Priority-Medium label.
Changed the title to: "[missing] Expose Window.createImageBitmap".

I'm not sure what this issue is hoping to achieve, but if it adds support for self.createImageBitmap() - Web APIs | MDN, 👍

This API is still not exposed as of current dev. Is it because it's unsupported in Edge?

What's going on with this? I can't find it in dart:html. I see there is ImageBitmap: https://api.dartlang.org/stable/2.1.0/dart-html/ImageBitmap-class.html

But no way to create it? Please, it's been over 5 years now, and this is important functionality. Seems to be a ton of stuff missing from the web platform, :(

CC @teresy @vsmenon – we have a big backlog here. We'd like to do work to cleanup our JS-interop work then we plan to come back to all of the web APIs.

Thanks for your patience.

Will the JS-interop cleanup somehow improve this situation? Or are they orthogonal?

Our current setup for generating Dart APIs over the browser's JS APIs has a number of issues – and it's different than how we let external folks do interop.

We'd like to create a single, better model for both before we spend more time doing one-off fixes to the existing dart:web libraries.

Can you point me toward more info on the planned model?

@jmesserly may have some details to share

#35084 is tracking JS interop improvements, that would allow an interop-based approach to the DOM.

Took a look at https://github.com/dart-lang/sdk/blob/js_interop/pkg/js/proposal.md, and, I gotta say, that looks like it's going to take quite a while to implement. (But it looks great!)

Can there not be a parallel effort here? I understand there's limited resources, but is it really that hard to expose missing APIs? Like this one that was just added? c5cfdc5#diff-2326766614acd647cd69f60e35033cc2

Is it something I can maybe pitch in with?

Any update on this? Seems to still be missing.

The kicker here is, I can work around it with package:js's callMethod and promiseToFuture to get an ImageBitmap. But I can't set it as a CanvasImageSource, because ImageBitmap isn't an implementer, even though it certainly should be:

https://api.dart.dev/stable/2.7.0/dart-html/CanvasImageSource-class.html

Right now, I get Expected a value of type 'CanvasImageSource', but got one of type 'ImageBitmap'

Any workarounds?