Function once

once<K>(eventName, fn): void
Adds a one-time listener for the eventName event.
Type Parameters
- K extends keyof CommandHandlerEvents
  Event names of the CommandHandler listener.
Parameters
- eventName: K
  The event name.
- fn: ((...args) => void)
  The callback to execute.
  - - (...args): void
    - Parameters
      Rest ...args: CommandHandlerEvents[K]
      Returns void
Returns void
- Defined in source/src/CommandHandler.ts:329

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