import pug from 'pug';
import Koa from 'koa';
export declare class KoaPug {
    viewPath: string;
    noCache: boolean;
    helpers: {
        [key: string]: (...args: any[]) => any;
    };
    private defaultOptions;
    private defaultLocals;
    constructor(options?: PugOptions);
    get locals(): {
        [key: string]: any;
    };
    set locals(value: {
        [key: string]: any;
    });
    get options(): PugOptions | undefined;
    set options(options: PugOptions | undefined);
    /**
     * Compile .pug file
     * @param tpl The path of template file
     * @param locals Variables and helpers that passed to Pug compiler
     * @param compileOptions
     */
    private compileFile;
    /**
     * Compile a Pug template string
     * @param tpl Template string or the path of template file
     */
    private compileString;
    /**
     * Render Pug tamplate
     * @param tpl Template string or the path of template file
     * @param locals Variables and helpers that passed to Pug compiler
     * @param options
     */
    render(tpl: string, locals?: any, options?: RenderOptions): Promise<string>;
    /**
     * Bind render function to Koa context
     * @param app Koa instance
     */
    use<StateT = Koa.DefaultState, CustomT = Koa.DefaultContext>(app: Koa<StateT, CustomT>): void;
}
export default KoaPug;
export { PugOptions, RenderOptions };
declare module 'koa' {
    interface BaseContext {
        render: (tpl: string, locals?: any, options?: RenderOptions, noCache?: boolean) => Promise<void>;
    }
}
interface PugOptions<StateT = Koa.DefaultState, CustomT = Koa.DefaultContext> extends pug.Options {
    [key: string]: any;
    /**
     * Koa instance
     */
    app?: Koa<StateT, CustomT>;
    /**
     * Paths of helpers.
     */
    helperPath?: any[];
    /**
     * Add a list of variables to make accessible in templates
     */
    locals?: {
        [key: string]: any;
    };
    /**
     * The root directory of all Pug templates
     */
    viewPath?: string;
}
interface RenderOptions extends PugOptions {
    /**
     * Render template string instead template file
     */
    fromString?: boolean;
}