import { TemplateEngineEnum } from '../../interfaces/template.types';
import { TemplateEngine } from '../template-engine';
import { CustomEngineOptions } from '../../interfaces/module-config.interface';
export declare class HandlebarsEngine extends TemplateEngine {
    private readonly options;
    private readonly customOptions;
    static engineName: TemplateEngineEnum;
    static displayName: string;
    static peerPackage: string;
    private instance?;
    constructor(options?: Record<string, any>, customOptions?: CustomEngineOptions);
    private getInstance;
    render(content: string, data?: Record<string, any>): Promise<string>;
    validate(content: string): Promise<boolean>;
}