/**
 * A collection of async functions.
 */
export declare class CallbackCollection<F extends (...args: any[]) => Promise<any>> {
    #private;
    append(callback: F): void;
    prepend(callback: F): void;
    remove(callback: F): void;
    callParallel(...args: Parameters<F>): Promise<Awaited<ReturnType<F>>[]>;
    callSerial(...args: Parameters<F>): Promise<Awaited<ReturnType<F>>[]>;
}
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