import { GraphQLResolveInfo } from 'graphql';
import { ModuleMetadata } from './../module/metadata';
export declare type Next<T = any> = () => Promise<T>;
export declare type Middleware<TContext = MiddlewareContext> = (context: TContext, next: Next) => Promise<any>;
export declare function compose<TContext>(middleware: Array<Middleware<TContext>>): (context: TContext, next: Next) => Promise<any>;
export interface MiddlewareContext {
    root: any;
    args: {
        [argName: string]: any;
    };
    context: GraphQLModules.ModuleContext;
    info: GraphQLResolveInfo;
}
export declare type MiddlewareMap = {
    [type: string]: {
        [field: string]: Middleware[];
    };
};
export declare function createMiddleware(path: string[], middlewareMap?: MiddlewareMap): (context: MiddlewareContext, next: Next<any>) => Promise<any>;
export declare function mergeMiddlewareMaps(app: MiddlewareMap, mod: MiddlewareMap): MiddlewareMap;
export declare function validateMiddlewareMap(middlewareMap: MiddlewareMap, metadata: ModuleMetadata): void;