import { FieldNode, GraphQLEnumType, GraphQLEnumValueConfig, GraphQLFieldConfig, GraphQLInputFieldConfig, GraphQLInputObjectType, GraphQLInterfaceType, GraphQLNamedType, GraphQLObjectType, GraphQLSchema, SelectionSetNode } from 'graphql';
import { Subschema, SubschemaConfig } from '@graphql-tools/delegate';
import { IExecutableSchemaDefinition } from '@graphql-tools/schema';
import { Maybe, TypeSource } from '@graphql-tools/utils';
export interface MergeTypeCandidate<TContext = Record<string, any>> {
    type: GraphQLNamedType;
    subschema?: GraphQLSchema | SubschemaConfig<any, any, any, TContext>;
    transformedSubschema?: Subschema<any, any, any, TContext>;
}
export interface MergeFieldConfigCandidate<TContext = Record<string, any>> {
    fieldConfig: GraphQLFieldConfig<any, TContext>;
    fieldName: string;
    type: GraphQLObjectType | GraphQLInterfaceType;
    subschema?: GraphQLSchema | SubschemaConfig<any, any, any, TContext>;
    transformedSubschema?: Subschema<any, any, any, TContext>;
}
export interface MergeInputFieldConfigCandidate<TContext = Record<string, any>> {
    inputFieldConfig: GraphQLInputFieldConfig;
    fieldName: string;
    type: GraphQLInputObjectType;
    subschema?: GraphQLSchema | SubschemaConfig<any, any, any, TContext>;
    transformedSubschema?: Subschema<any, any, any, TContext>;
}
export interface MergeEnumValueConfigCandidate<TContext = Record<string, any>> {
    enumValueConfig: GraphQLEnumValueConfig;
    enumValue: string;
    type: GraphQLEnumType;
    subschema?: GraphQLSchema | SubschemaConfig<any, any, any, TContext>;
    transformedSubschema?: Subschema<any, any, any, TContext>;
}
export type MergeTypeFilter<TContext = Record<string, any>> = (mergeTypeCandidates: Array<MergeTypeCandidate<TContext>>, typeName: string) => boolean;
export interface IStitchSchemasOptions<TContext = Record<string, any>> extends Omit<IExecutableSchemaDefinition<TContext>, 'typeDefs'> {
    subschemas?: Array<GraphQLSchema | SubschemaConfig<any, any, any, TContext>>;
    typeDefs?: TypeSource;
    types?: Array<GraphQLNamedType>;
    onTypeConflict?: OnTypeConflict<TContext>;
    mergeDirectives?: boolean | undefined;
    mergeTypes?: boolean | Array<string> | MergeTypeFilter<TContext>;
    typeMergingOptions?: TypeMergingOptions<TContext>;
    subschemaConfigTransforms?: Array<SubschemaConfigTransform<TContext>>;
}
export type SubschemaConfigTransform<TContext = Record<string, any>> = (subschemaConfig: SubschemaConfig<any, any, any, TContext>) => SubschemaConfig<any, any, any, TContext> | Array<SubschemaConfig<any, any, any, TContext>>;
export interface TypeMergingOptions<TContext = Record<string, any>> {
    validationSettings?: ValidationSettings;
    validationScopes?: Record<string, ValidationSettings>;
    typeCandidateMerger?: (candidates: Array<MergeTypeCandidate<TContext>>) => MergeTypeCandidate<TContext>;
    typeDescriptionsMerger?: (candidates: Array<MergeTypeCandidate<TContext>>) => Maybe<string>;
    fieldConfigMerger?: (candidates: Array<MergeFieldConfigCandidate<TContext>>) => GraphQLFieldConfig<any, TContext>;
    inputFieldConfigMerger?: (candidates: Array<MergeInputFieldConfigCandidate<TContext>>) => GraphQLInputFieldConfig;
    enumValueConfigMerger?: (candidates: Array<MergeEnumValueConfigCandidate<TContext>>) => GraphQLEnumValueConfig;
    useNonNullableFieldOnConflict?: boolean;
}
export declare enum ValidationLevel {
    Error = "error",
    Warn = "warn",
    Off = "off"
}
export interface ValidationSettings {
    validationLevel?: ValidationLevel;
    strictNullComparison?: boolean;
    proxiableScalars?: Record<string, Array<string>>;
}
export type OnTypeConflict<TContext = Record<string, any>> = (left: GraphQLNamedType, right: GraphQLNamedType, info?: {
    left: {
        subschema?: GraphQLSchema | SubschemaConfig<any, any, any, TContext>;
        transformedSubschema?: Subschema<any, any, any, TContext>;
    };
    right: {
        subschema?: GraphQLSchema | SubschemaConfig<any, any, any, TContext>;
        transformedSubschema?: Subschema<any, any, any, TContext>;
    };
}) => GraphQLNamedType;
declare module '@graphql-tools/utils' {
    interface IFieldResolverOptions<TSource = any, TContext = any, TArgs = any> {
        selectionSet?: string | ((node: FieldNode) => SelectionSetNode);
    }
}