Merge pull request #310 from JeffRMoore/resolve-fn-types

Add named type for user defined resolveType and isTypeOf functions

Author: leebyron

src/type/definition.js

@@ -302,7 +302,7 @@ export type GraphQLScalarTypeConfig<InternalType> = {
 export class GraphQLObjectType {
   name: string;
   description: ?string;
-  isTypeOf: ?(value: mixed, info?: GraphQLResolveInfo) => boolean;
+  isTypeOf: ?GraphQLIsTypeOfFn;
 
   _typeConfig: GraphQLObjectTypeConfig;
   _fields: GraphQLFieldDefinitionMap;
@@ -460,14 +460,24 @@ export type GraphQLObjectTypeConfig = {
   name: string;
   interfaces?: GraphQLInterfacesThunk | Array<GraphQLInterfaceType>;
   fields: GraphQLFieldConfigMapThunk | GraphQLFieldConfigMap;
-  isTypeOf?: (value: mixed, info?: GraphQLResolveInfo) => boolean;
+  isTypeOf?: GraphQLIsTypeOfFn;
   description?: ?string
 }
 
 type GraphQLInterfacesThunk = () => Array<GraphQLInterfaceType>;
 
 type GraphQLFieldConfigMapThunk = () => GraphQLFieldConfigMap;
 
+export type GraphQLTypeResolveFn = (
+  value: mixed,
+  info?: GraphQLResolveInfo
+) => ?GraphQLObjectType
+
+export type GraphQLIsTypeOfFn = (
+  value: mixed,
+  info?: GraphQLResolveInfo
+) => boolean
+
 export type GraphQLFieldResolveFn = (
   source: mixed,
   args: {[argName: string]: mixed},
@@ -551,7 +561,7 @@ export type GraphQLFieldDefinitionMap = {
 export class GraphQLInterfaceType {
   name: string;
   description: ?string;
-  resolveType: ?(value: mixed, info?: GraphQLResolveInfo) => ?GraphQLObjectType;
+  resolveType: ?GraphQLTypeResolveFn;
 
   _typeConfig: GraphQLInterfaceTypeConfig;
   _fields: GraphQLFieldDefinitionMap;
@@ -622,7 +632,7 @@ export type GraphQLInterfaceTypeConfig = {
    * the default implementation will call `isTypeOf` on each implementing
    * Object type.
    */
-  resolveType?: (value: mixed, info?: GraphQLResolveInfo) => ?GraphQLObjectType,
+  resolveType?: GraphQLTypeResolveFn,
   description?: ?string
 };
 
@@ -654,7 +664,7 @@ export type GraphQLInterfaceTypeConfig = {
 export class GraphQLUnionType {
   name: string;
   description: ?string;
-  resolveType: ?(value: mixed, info?: GraphQLResolveInfo) => ?GraphQLObjectType;
+  resolveType: ?GraphQLTypeResolveFn;
 
   _typeConfig: GraphQLUnionTypeConfig;
   _types: Array<GraphQLObjectType>;
@@ -729,7 +739,7 @@ export type GraphQLUnionTypeConfig = {
    * the default implementation will call `isTypeOf` on each implementing
    * Object type.
    */
-  resolveType?: (value: mixed, info?: GraphQLResolveInfo) => ?GraphQLObjectType;
+  resolveType?: GraphQLTypeResolveFn;
   description?: ?string;
 };