import type { Application, Request, Response, NextFunction } from 'express';
import nunjucks, { type ILoader, type ConfigureOptions } from 'nunjucks';
type Constructable<T = any> = new (...args: any[]) => T;
type LoaderType = Constructable<ILoader>;
type FilterFunc = (...args: any[]) => any;
type ContextProcessorContext = Record<string, any>;
export type ContextProcessor = (req: Request, ctx: ContextProcessorContext) => void;
declare const envKeys: readonly ["autoescape", "throwOnUndefined", "trimBlocks", "lstripBlocks", "tags"];
type EnvKeysType = (typeof envKeys)[number];
type EnvOptions = Pick<ConfigureOptions, EnvKeysType>;
interface Configuration extends EnvOptions {
    watch?: boolean;
    noCache?: boolean;
    filters?: Record<string, FilterFunc>;
    loader?: LoaderType;
    globals?: Record<string, any>;
}
export declare const expressNunjucks: (apps?: Application | Application[], config?: Configuration) => {
    env: nunjucks.Environment;
    ctxProc: (ctxProcessors: ContextProcessor[]) => (req: Request, res: Response, next: NextFunction) => void;
};
export default expressNunjucks;