Flutter for Web - Trying to callback from javascript to dart

[Simon Ampleman]

Hello,

I am trying to pass a dart function to javascript, keep it in reference, and later, when one of the javascript has a callback from a webservice, call the dart function.

It works well if I call the dart function directly in the javascript function, but when I keep its reference and call it later, it crash indicating that call method is not found.

Is there a documentation on how I could work this out (flutter / js interop) ?

Thank you,

Simon