Wrong subtype only in --release (Dart 2.7.2)

[jscholler]

Hello Rob,

I got this weird issue when I build with webdev build --release, I get this error right at the beginning of dispatching the event:
main.dart.js:395 Uncaught TypeError: Instance of 'minified:cm': type 'minified:cm' is not a subtype of type 'Listminified:cs'`

When building with webdev build --no-release or doing webdev serve, this does not happen.

After blindly poking around a bit, I noticed that the error disappeared when changing:
static void _dispatchResizes(JsArray<JsObject> entries, JsObject jsResizeObserver)
to
static void _dispatchResizes(JsArray entries, JsObject jsResizeObserver)

I don't know if this is a proper fix but it works for me :)

BTW, I get the same issue with ResizeObserver from the official dart:html

[robrbecker]

Hey, thanks for reporting this! I'll have to investigate your proposed solution but it looks like that could be all that's needed. Is there a bug filed for dart:html as well?

[robrbecker]

I did have a chance to verify this bug. It's currently a runtime type check that "goes away" if you compile with optimization level 3 (-O3). I'll still fix it though.

[robrbecker]

Fixed and released version 1.0.2