import { type Member } from './Structures.js';
declare global {
    interface Object {
        /** Check if an object is flat or a composite */
        isHigherOrder: () => boolean;
    }
    interface Promise<T> {
        /** For a Promise<any[ ]>, returns a promise with the first element or null  */
        first(): Promise<Member<T> | null>;
        /** For a Promise<any[ ]>, returns a promise with the first element or fallback  */
        first(fallback: Member<T>): Promise<Member<T>>;
    }
}