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EventEmitter.on

EventEmitter.on() method

Bind an event listener to fire when an event occurs.

Signature:

class EventEmitter {
  on<Key extends keyof EventsWithWildcard<Events>>(
    type: Key,
    handler: Handler<EventsWithWildcard<Events>[Key]>
  ): this;
}

Parameters

Parameter

Type

Description

type

Key

the event type you'd like to listen to. Can be a string or symbol.

handler

Handler<EventsWithWildcard<Events>[Key]>

the function to be called when the event occurs.

**Returns:**

this

this to enable you to chain method calls.