(Summarizing the problem and the solution here for the record)
When passing a top-level function to a call that expects a lambda, WebSharper 3 (not 4) wraps it in a lambda, so it's a different actual function every time and that messes with things like unsubscribing from events which expects the exact same function object. The solution is to create a local lambda by hand:
1 2 3 4 5 6 7 8 9 10 11 12
// Top-level function
let subscribeFn (data:obj) = JS.Alert(data :?> string)
let test() =
// This doesn't work because the two instances of `subscribeFn` are different lambdas:
Amplify.Amplify.Subscribe("tryPubSub", subscribeFn)
Amplify.Amplify.Unsubscribe("tryPubSub", subscribeFn)
// This works:
let subscribeFn = fun (o: obj) -> subscribeFn o
Amplify.Amplify.Subscribe("tryPubSub", subscribeFn)
Amplify.Amplify.Unsubscribe("tryPubSub", subscribeFn)Topic tags
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Could some one take a look at this issue: http://stackoverflow.com/questions/38995244/javascript-function-signatures-in-websharper ?