export type CopyFilterSync = (source: string, destination: string) => boolean;
export type CopyFilterAsync = (source: string, destination: string) => Promise<boolean>;
export type CopyOptions<T = CopyFilterSync | CopyFilterAsync> = {
    overwrite?: boolean;
    clobber?: boolean;
    dereference?: boolean;
    preserveTimestamps?: boolean;
    errorOnExist?: boolean;
    filter?: T;
};
export type CopyOptionsInput<T> = CopyOptions<T> | T | undefined;
export declare function normalizeOptions<T>(input: CopyOptionsInput<T>): CopyOptions<T>;