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| 1 | +/** |
| 2 | + * Minimal `EventEmitter` interface that is molded against the Node.js |
| 3 | + * `EventEmitter` interface. |
| 4 | + */ |
| 5 | +declare class EventEmitter3< |
| 6 | + EventTypes extends ValidEventTypes = string | symbol, |
| 7 | + Context extends any = any |
| 8 | +> { |
| 9 | + static prefixed: string | boolean; |
| 10 | + |
| 11 | + /** |
| 12 | + * Return an array listing the events for which the emitter has registered |
| 13 | + * listeners. |
| 14 | + */ |
| 15 | + eventNames(): Array<EventNames<EventTypes>>; |
| 16 | + |
| 17 | + /** |
| 18 | + * Return the listeners registered for a given event. |
| 19 | + */ |
| 20 | + listeners<T extends EventNames<EventTypes>>( |
| 21 | + event: T |
| 22 | + ): Array<EventListener3<EventTypes, T>>; |
| 23 | + |
| 24 | + /** |
| 25 | + * Return the number of listeners listening to a given event. |
| 26 | + */ |
| 27 | + listenerCount(event: EventNames<EventTypes>): number; |
| 28 | + |
| 29 | + /** |
| 30 | + * Calls each of the listeners registered for a given event. |
| 31 | + */ |
| 32 | + emit<T extends EventNames<EventTypes>>( |
| 33 | + event: T, |
| 34 | + ...args: EventArgs<EventTypes, T> |
| 35 | + ): boolean; |
| 36 | + |
| 37 | + /** |
| 38 | + * Add a listener for a given event. |
| 39 | + */ |
| 40 | + on<T extends EventNames<EventTypes>>( |
| 41 | + event: T, |
| 42 | + fn: EventListener3<EventTypes, T>, |
| 43 | + context?: Context |
| 44 | + ): this; |
| 45 | + addListener<T extends EventNames<EventTypes>>( |
| 46 | + event: T, |
| 47 | + fn: EventListener3<EventTypes, T>, |
| 48 | + context?: Context |
| 49 | + ): this; |
| 50 | + |
| 51 | + /** |
| 52 | + * Add a one-time listener for a given event. |
| 53 | + */ |
| 54 | + once<T extends EventNames<EventTypes>>( |
| 55 | + event: T, |
| 56 | + fn: EventListener3<EventTypes, T>, |
| 57 | + context?: Context |
| 58 | + ): this; |
| 59 | + |
| 60 | + /** |
| 61 | + * Remove the listeners of a given event. |
| 62 | + */ |
| 63 | + removeListener<T extends EventNames<EventTypes>>( |
| 64 | + event: T, |
| 65 | + fn?: EventListener3<EventTypes, T>, |
| 66 | + context?: Context, |
| 67 | + once?: boolean |
| 68 | + ): this; |
| 69 | + off<T extends EventNames<EventTypes>>( |
| 70 | + event: T, |
| 71 | + fn?: EventListener3<EventTypes, T>, |
| 72 | + context?: Context, |
| 73 | + once?: boolean |
| 74 | + ): this; |
| 75 | + |
| 76 | + /** |
| 77 | + * Remove all listeners, or those of the specified event. |
| 78 | + */ |
| 79 | + removeAllListeners(event?: EventNames<EventTypes>): this; |
| 80 | +} |
| 81 | + |
| 82 | +declare interface ListenerFn<Args extends any[] = any[]> { |
| 83 | + (...args: Args): void; |
| 84 | +} |
| 85 | + |
| 86 | +declare interface EventEmitterStatic { |
| 87 | + new < |
| 88 | + EventTypes extends ValidEventTypes = string | symbol, |
| 89 | + Context = any |
| 90 | + >(): EventEmitter3<EventTypes, Context>; |
| 91 | +} |
| 92 | + |
| 93 | +/** |
| 94 | + * `object` should be in either of the following forms: |
| 95 | + * ``` |
| 96 | + * interface EventTypes { |
| 97 | + * 'event-with-parameters': any[] |
| 98 | + * 'event-with-example-handler': (...args: any[]) => void |
| 99 | + * } |
| 100 | + * ``` |
| 101 | + */ |
| 102 | +declare type ValidEventTypes = string | symbol | object; |
| 103 | + |
| 104 | +declare type EventNames<T extends ValidEventTypes> = T extends string | symbol |
| 105 | + ? T |
| 106 | + : keyof T; |
| 107 | + |
| 108 | +declare type ArgumentMap<T extends object> = { |
| 109 | + [K in keyof T]: T[K] extends (...args: any[]) => void |
| 110 | + ? Parameters<T[K]> |
| 111 | + : T[K] extends any[] |
| 112 | + ? T[K] |
| 113 | + : any[]; |
| 114 | +}; |
| 115 | + |
| 116 | +declare type EventListener3< |
| 117 | + T extends ValidEventTypes, |
| 118 | + K extends EventNames<T> |
| 119 | +> = T extends string | symbol |
| 120 | + ? (...args: any[]) => void |
| 121 | + : ( |
| 122 | + ...args: ArgumentMap<Exclude<T, string | symbol>>[Extract<K, keyof T>] |
| 123 | + ) => void; |
| 124 | + |
| 125 | +declare type EventArgs< |
| 126 | + T extends ValidEventTypes, |
| 127 | + K extends EventNames<T> |
| 128 | +> = Parameters<EventListener3<T, K>>; |
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