export type TemplateData = Record<string, unknown>;
export type TemplateFn = (data?: TemplateData) => string;
export type TemplateRegistry = Record<string, TemplateFn>;
export declare const defaultTemplates: TemplateRegistry;
export declare class PromptEngine {
    private templates;
    constructor(overrides?: Partial<TemplateRegistry>, fileOverrides?: Record<string, string>);
    /** Render a template by key */
    render(name: string, data?: TemplateData): string;
    /** Register brand‑new template (fails if key exists) */
    register(name: string, template: TemplateFn): void;
    /** Overwrite existing or create new template unconditionally */
    overwrite(name: string, template: TemplateFn): void;
    /** Register template from a markdown file (fails if key exists) */
    registerFromFile(name: string, filePath: string): void;
    /** Load every .md file in dir as new templates (fails on duplicates) */
    loadDir(dir: string): void;
    /** Overwrite (or create) template from file */
    overwriteFromFile(name: string, filePath: string): void;
    /** Apply multiple file overrides at once */
    applyFileOverrides(map: Record<string, string>): void;
}