EventEmitter.on() method

Bind an event listener to fire when an event occurs.

Signature

typescript

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

Parameters

Parameter

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Type

</th><th>

Description

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type

</td><td>

Key

</td><td>

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

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handler

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Handler<EventsWithWildcard<Events>[Key]>

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the function to be called when the event occurs.

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Returns:

this

this to enable you to chain method calls.