/**
 * Direction utilities for flowchart diagrams.
 */
/**
 * Valid flowchart direction values.
 */
export type FlowchartDirection = "TD" | "TB" | "BT" | "LR" | "RL";
/**
 * Get flowchart direction or default.
 * @param direction - Optional direction from input
 * @returns Valid direction value (defaults to "TD")
 */
export declare function getDirection(direction?: string): FlowchartDirection;
/**
 * Check if a direction value is valid.
 * @param direction - Direction to validate
 * @returns True if valid
 */
export declare function isValidDirection(direction: string): boolean;
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