Function FragmentSpread

src/validation/rules/PossibleFragmentSpreadsRule.ts:86–104

(node)

      }
    },
    FragmentSpread(node) {
      const fragName = node.name.value;
      const fragType = getFragmentType(context, fragName);
      const parentType = context.getParentType();
      if (
        fragType &&
        parentType &&
        !doTypesOverlap(context.getSchema(), fragType, parentType)
      ) {
        const parentTypeStr = inspect(parentType);
        const fragTypeStr = inspect(fragType);
        context.reportError(
          new GraphQLError(
            `Fragment "${fragName}" cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`,
            { nodes: node },
          ),
        );
      }
    },
  };
}