There's a risk that a event is emitted before its' handler has been registered. You mi

Persist events that not yet have a handler about mitt HOT 1 OPEN

AndreasJilvero commented on June 2, 2024

Persist events that not yet have a handler

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Comments (1)

phoenix-ru commented on June 2, 2024 3

I think you can emulate it with a simple queue and a catch-all, something like

const queue = new Map<string, unknown>()
emitter.on('*', (type: string, ev: unknown) => {
  // Disable processing when event is already registered
  if (emitter.all.has(type)) return

  if (!queue.has(type)) queue.set(type, [])
  queue.get(type).push(ev)
})

And then, when you are finally ready, add the necessary handler and flush the queue:

function addHandler(type: string, handler: (v: unknown) => void) {
  emitter.on(type, handler)
  ;(queue.get(type) || []).forEach(v => emitter.emit(type, v))
  
  // Free the resources
  queue.delete(type)
}

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Persist events that not yet have a handler about mitt HOT 1 OPEN

Comments (1)

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