/**
 * Generate a unique ID
 */
export declare function generateId(): string;
/**
 * Calculate order total with tax
 */
export declare function calculateTotal(subtotal: number, taxRate?: number): number;
/**
 * Check if user has permission
 */
export declare function hasPermission(userRole: string, requiredRole: string): boolean;
/**
 * Sleep utility for async operations
 */
export declare function sleep(ms: number): Promise<void>;
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