import * as nunjucks from 'nunjucks';
import { BaseCompilerEnvironment } from '../compiler-environment';
export declare const implementedOnAstVisit: (source: any) => source is OnAstVisit;
/**
 * Visit every nodes after compiling, you can extract metadata from them, or even modify some nodes.
 */
export interface OnAstVisit {
    onVisit(node: nunjucks.nodes.Node, env: BaseCompilerEnvironment): void;
    finish?: () => void;
}
export declare const implementedProvideMetadata: (source: any) => source is ProvideMetadata;
/**
 * Providing metadata after compiling
 */
export interface ProvideMetadata {
    metadataName: string;
    getMetadata(): any;
}