Interface AmittEmitter<Keys, Events>

interface AmittEmitter<
    Keys extends EventType = any,
    Events extends Map<string, Set<any>> = Map<string, Set<any>>,
> {
    emit<U extends any[] = [], V extends any[] = any[]>(
        type: Keys,
        ...args: U,
    ): V;
    off<U = any>(type: string, handler: U): boolean;
    on<U extends any[] = [], V = any>(
        type: string,
        handler: (
            ...args: [...U[], { once: boolean; type: Keys }],
        ) => V | Promise<V>,
    ): boolean;
    once<U extends any[] = [], V = any>(
        type: string,
        handler: (
            ...args: [...U[], { once: boolean; type: Keys }],
        ) => V | Promise<V>,
    ): boolean;
}