1 | export declare type EventType = string | symbol;
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2 | export declare type Handler<T = unknown> = (event: T) => void;
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3 | export declare type WildcardHandler<T = Record<string, unknown>> = (type: keyof T, event: T[keyof T]) => void;
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4 | export declare type EventHandlerList<T = unknown> = Array<Handler<T>>;
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5 | export declare type WildCardEventHandlerList<T = Record<string, unknown>> = Array<WildcardHandler<T>>;
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6 | export declare type EventHandlerMap<Events extends Record<EventType, unknown>> = Map<keyof Events | '*', EventHandlerList<Events[keyof Events]> | WildCardEventHandlerList<Events>>;
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7 | export interface Emitter<Events extends Record<EventType, unknown>> {
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8 | all: EventHandlerMap<Events>;
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9 | on<Key extends keyof Events>(type: Key, handler: Handler<Events[Key]>): void;
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10 | on(type: '*', handler: WildcardHandler<Events>): void;
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11 | off<Key extends keyof Events>(type: Key, handler?: Handler<Events[Key]>): void;
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12 | off(type: '*', handler: WildcardHandler<Events>): void;
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13 | emit<Key extends keyof Events>(type: Key, event: Events[Key]): void;
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14 | emit<Key extends keyof Events>(type: undefined extends Events[Key] ? Key : never): void;
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15 | }
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20 |
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21 | export default function mitt<Events extends Record<EventType, unknown>>(all?: EventHandlerMap<Events>): Emitter<Events>;
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