Fix validators to be aware of type-condition-less inline frags

Author: leebyron

src/validation/__tests__/FragmentsOnCompositeTypes.js

@@ -50,6 +50,16 @@ describe('Validate: Fragments on composite types', () => {
     `);
   });
 
+  it('inline fragment without type is valid', () => {
+    expectPassesRule(FragmentsOnCompositeTypes, `
+      fragment validFragment on Pet {
+        ... {
+          name
+        }
+      }
+    `);
+  });
+
   it('union is valid fragment type', () => {
     expectPassesRule(FragmentsOnCompositeTypes, `
       fragment validFragment on CatOrDog {

src/validation/__tests__/OverlappingFieldsCanBeMerged.js

@@ -455,6 +455,17 @@ describe('Validate: Overlapping fields can be merged', () => {
       `);
     });
 
+    it('allows inline typeless fragments', () => {
+      expectPassesRuleWithSchema(schema, OverlappingFieldsCanBeMerged, `
+        {
+          a
+          ... {
+            a
+          }
+        }
+      `);
+    });
+
     it('compares deep types including list', () => {
       expectFailsRuleWithSchema(schema, OverlappingFieldsCanBeMerged, `
         {

src/validation/rules/FragmentsOnCompositeTypes.js

@@ -39,7 +39,7 @@ export function FragmentsOnCompositeTypes(context: ValidationContext): any {
   return {
     InlineFragment(node) {
       var type = context.getType();
-      if (type && !isCompositeType(type)) {
+      if (node.typeCondition && type && !isCompositeType(type)) {
         return new GraphQLError(
           inlineFragmentOnNonCompositeErrorMessage(print(node.typeCondition)),
           [ node.typeCondition ]

src/validation/rules/OverlappingFieldsCanBeMerged.js

@@ -261,9 +261,13 @@ function collectFieldASTsAndDefs(
         _astAndDefs[responseName].push([ selection, fieldDef ]);
         break;
       case INLINE_FRAGMENT:
+        var typeCondition = selection.typeCondition;
+        var inlineFragmentType = typeCondition ?
+          typeFromAST(context.getSchema(), selection.typeCondition) :
+          parentType;
         _astAndDefs = collectFieldASTsAndDefs(
           context,
-          typeFromAST(context.getSchema(), selection.typeCondition),
+          inlineFragmentType,
           selection.selectionSet,
           _visitedFragmentNames,
           _astAndDefs