/**
 * Input validation utilities for lumen.
 * Lifted from @the-forge-flow/visual-explainer-pi: src/utils/validators.ts.
 * Adapted to avoid type casts: uses Set membership + Reflect.get + type guards.
 */
import type { Aesthetic, AnyAesthetic, FgraphAesthetic, GenerateVisualParams, Theme, VisualType } from "../types.js";
export declare function isAesthetic(value: unknown): value is Aesthetic;
export declare function isFgraphAesthetic(value: unknown): value is FgraphAesthetic;
export declare function validateVisualType(type: unknown): VisualType;
/**
 * Tool-level aesthetic validation. Accepts any value from either the mermaid
 * palette set OR the fgraph aesthetic set; renderers narrow at render time
 * (mermaid → narrow to Aesthetic with isAesthetic; diagram → narrow to
 * FgraphAesthetic with isFgraphAesthetic).
 */
export declare function validateAesthetic(aesthetic: unknown): AnyAesthetic;
export declare function validateTheme(theme: unknown): Theme;
export declare function validateParams(params: unknown): GenerateVisualParams;
export declare function sanitizeFilename(filename: string): string;
export declare function generateDefaultFilename(title: string): string;
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