import type { FlowContext } from '../types/index.js';
export type TemplateMissingBehavior = 'keep' | 'empty';
export interface RenderTemplateOptions {
    missing?: TemplateMissingBehavior;
}
/**
 * Very small mustache-like renderer for flow prompts.
 * Supports: {{key}} and {{nested.key}} from collectedData.
 */
export declare function renderFlowTemplate(text: string | undefined | null, data: Record<string, unknown>, options?: RenderTemplateOptions): string;
export declare function renderNodePrompt(prompt: string | undefined | null, ctx: FlowContext): string;
export declare function compileSanitizePattern(pattern: string): RegExp;