Merge pull request graphql#994 from APIs-guru/cleanupBuildAstSchema

remove dead code from buildASTSchema

Author: wincent

src/utilities/buildASTSchema.js

@@ -316,26 +316,16 @@ export function buildASTSchema(ast: DocumentNode): GraphQLSchema {
   }
 
   function typeDefNamed(typeName: string): GraphQLNamedType {
-    if (innerTypeMap[typeName]) {
-      return innerTypeMap[typeName];
-    }
-
-    if (!nodeMap[typeName]) {
-      throw new Error(`Type "${typeName}" not found in document.`);
-    }
-
-    const innerTypeDef = makeSchemaDef(nodeMap[typeName]);
-    if (!innerTypeDef) {
-      throw new Error(`Nothing constructed for "${typeName}".`);
+    if (!innerTypeMap[typeName]) {
+      if (!nodeMap[typeName]) {
+        throw new Error(`Type "${typeName}" not found in document.`);
+      }
+      innerTypeMap[typeName] = makeSchemaDef(nodeMap[typeName]);
     }
-    innerTypeMap[typeName] = innerTypeDef;
-    return innerTypeDef;
+    return innerTypeMap[typeName];
   }
 
   function makeSchemaDef(def) {
-    if (!def) {
-      throw new Error('def must be defined');
-    }
     switch (def.kind) {
       case Kind.OBJECT_TYPE_DEFINITION:
         return makeTypeDef(def);
@@ -403,9 +393,8 @@ export function buildASTSchema(ast: DocumentNode): GraphQLSchema {
   }
 
   function makeInterfaceDef(def: InterfaceTypeDefinitionNode) {
-    const typeName = def.name.value;
     return new GraphQLInterfaceType({
-      name: typeName,
+      name: def.name.value,
       description: getDescription(def),
       fields: () => makeFieldDefMap(def),
       astNode: def,
@@ -414,7 +403,7 @@ export function buildASTSchema(ast: DocumentNode): GraphQLSchema {
   }
 
   function makeEnumDef(def: EnumTypeDefinitionNode) {
-    const enumType = new GraphQLEnumType({
+    return new GraphQLEnumType({
       name: def.name.value,
       description: getDescription(def),
       values: keyValMap(
@@ -428,8 +417,6 @@ export function buildASTSchema(ast: DocumentNode): GraphQLSchema {
       ),
       astNode: def,
     });
-
-    return enumType;
   }
 
   function makeUnionDef(def: UnionTypeDefinitionNode) {