import type { GraphQLSchema } from "graphql";
import type { IResolvers, TypeSource } from "@graphql-tools/utils";
export declare namespace Plugin {
    enum Phase {
        PREPARE = 0,
        DEFAULT = 1,
        FINALIZE = 2
    }
    type Transformer = (schema: GraphQLSchema) => GraphQLSchema;
    type Transformers = {
        [Key in `${Phase}`]?: Transformer;
    };
    function apply<Context = any>(plugin: Plugin<Context>): GraphQLSchema;
    function compose<Context = any>(plugins: Array<Plugin<Context>>): Plugin<Context>;
    function composeTransformerByPhase<Context>(plugins: Array<Plugin<Context>>, phase: Phase): (schema: GraphQLSchema) => GraphQLSchema;
    function getTransformerByPhase<Context>(plugin: Plugin<Context>, phase: Phase): Transformer | undefined;
}
export interface Plugin<Context = any> {
    typeDefs?: TypeSource;
    resolvers?: IResolvers<any, Context>;
    transformer?: Plugin.Transformer | Plugin.Transformers;
}