@apollo/federation

const buildFederatedSchema: any;

const compositionRules: any[];

const defaultRootOperationNameLookup: { [x: string]: DefaultRootOperationTypeName };

addFederationMetadataToSchemaNodes: ({
    schema,
    typeToServiceMap,
    externalFields,
    keyDirectivesMap,
    valueTypes,
    directiveDefinitionsMap,
    directiveMetadata,
}: {
    schema: GraphQLSchema;
    typeToServiceMap: TypeToServiceMap;
    externalFields: ExternalFieldDefinition[];
    keyDirectivesMap: KeyDirectivesMap;
    valueTypes: ValueTypes;
    directiveDefinitionsMap: DirectiveDefinitionsMap;
    directiveMetadata: DirectiveMetadata;
}) => void;

buildMapsFromServiceList: (serviceList: ServiceDefinition[]) => {
    typeToServiceMap: TypeToServiceMap;
    typeDefinitionsMap: TypeDefinitionsMap;
    typeExtensionsMap: TypeExtensionsMap;
    directiveDefinitionsMap: DirectiveDefinitionsMap;
    externalFields: ExternalFieldDefinition[];
    keyDirectivesMap: KeyDirectivesMap;
    valueTypes: ValueTypes;
    directiveMetadata: DirectiveMetadata;
};

buildSchemaFromDefinitionsAndExtensions: ({
    typeDefinitionsMap,
    typeExtensionsMap,
    directiveDefinitionsMap,
    directiveMetadata,
    serviceList,
}: {
    typeDefinitionsMap: TypeDefinitionsMap;
    typeExtensionsMap: TypeExtensionsMap;
    directiveDefinitionsMap: DirectiveDefinitionsMap;
    directiveMetadata: DirectiveMetadata;
    serviceList: ServiceDefinition[];
}) => { schema: GraphQLSchema; errors: GraphQLError[] };

composeAndValidate: (serviceList: ServiceDefinition[]) => CompositionResult;

composeServices: (services: ServiceDefinition[]) => CompositionResult;

compositionHasErrors: (
    compositionResult: CompositionResult
) => compositionResult is CompositionFailure;

findDirectivesOnNode: (
    node: ASTNodeWithDirectives,
    directiveName: string
) => DirectiveNode[];

isStringValueNode: (node: any) => node is StringValueNode;

normalizeTypeDefs: (typeDefs: DocumentNode) => DocumentNode;

type DefaultRootOperationTypeName = 'Query' | 'Mutation' | 'Subscription';

type DirectiveUsages = Map<string, DirectiveNode[]>;

type FieldSet = readonly (FieldNode | InlineFragmentNode)[];

type Maybe<T> = null | undefined | T;

type ServiceName = string | null;