Function defer

Wraps the given function in a defered promise, such that it will not execute until the promise is externally resolved. If you reject it, you must catch it.

const deferred = defer(async (message) => {
  console.log(message)
})

// nothing happens at this point
deferred()
	.then(() => console.log("after"))
	.catch(() => console.log("catches deferred.reject"))

deferred.resolve("message") // function logs
// or
deferred.reject() // above catch catches rejection

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