/**
 * Gets the min/max values handling nested arrays.
 */
export declare function extent(data: any[], attr: string): number[];
/**
 * Get the domain for the Y Axis.
 */
export declare function getYDomain({ scaled, data }: {
    scaled: any;
    data: any;
}): number[];
/**
 * Get the domain for the X Axis.
 */
export declare function getXDomain({ data }: {
    data: any;
}): number[];
/**
 * Returns a unique group domain.
 */
export declare function getGroupDomain(data: any[], attr: string): string[];
/**
 * Get a deeply nested group domain.
 */
export declare function getDeepGroupDomain(data: any[], attr: string): string[];