allowInterop<F extends Function> function
Returns a wrapper around function f that can be called from JavaScript
using package:js JavaScript interop.
The calling conventions in Dart2Js differ from JavaScript and so, by
default, it is not possible to call a Dart function directly. Wrapping with
allowInterop creates a function that can be called from JavaScript or
Dart. The semantics of the wrapped function are still more strict than
JavaScript, and the function will throw if called with too many or too few
arguments.
Calling this method repeatedly on a function will return the same result.
Implementation
external F allowInterop<F extends Function>(F f);