Function on

src/index.ts:66–73

* Register an event handler for the given type. * @param {string|symbol} type Type of event to listen for, or `'*'` for all events * @param {Function} handler Function to call in response to given event * @memberOf mitt

(type: Key, handler: GenericEventHandler)

		 * @memberOf mitt
		 */
		on<Key extends keyof Events>(type: Key, handler: GenericEventHandler) {
			const handlers: Array<GenericEventHandler> | undefined = all!.get(type);
			if (handlers) {
				handlers.push(handler);
			} else {
				all!.set(type, [handler] as EventHandlerList<Events[keyof Events]>);
			}
		},

		/**
		 * Remove an event handler for the given type.