/**
 * Theme utilities for Mermaid diagrams.
 */
/**
 * Apply theme to diagram code.
 * @param diagram - Mermaid diagram code
 * @param theme - Optional theme name
 * @returns Diagram code with theme applied
 */
export declare function applyTheme(diagram: string, theme?: string): string;
/**
 * Common theme names supported by Mermaid.
 */
export declare const COMMON_THEMES: readonly ["default", "dark", "forest", "neutral", "base"];
/**
 * Check if a theme name is in the common themes list.
 * @param theme - Theme name to check
 * @returns True if theme is recognized
 */
export declare function isCommonTheme(theme: string): boolean;
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