1 files changed, 63 insertions, 0 deletions
diff --git a/school/node_modules/graphql/validation/rules/PossibleFragmentSpreadsRule.js b/school/node_modules/graphql/validation/rules/PossibleFragmentSpreadsRule.js
new file mode 100644
index 0000000..427905d
--- /dev/null
+++ b/school/node_modules/graphql/validation/rules/PossibleFragmentSpreadsRule.js
@@ -0,0 +1,63 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.PossibleFragmentSpreadsRule = PossibleFragmentSpreadsRule;
+
+var _inspect = _interopRequireDefault(require("../../jsutils/inspect.js"));
+
+var _GraphQLError = require("../../error/GraphQLError.js");
+
+var _definition = require("../../type/definition.js");
+
+var _typeFromAST = require("../../utilities/typeFromAST.js");
+
+var _typeComparators = require("../../utilities/typeComparators.js");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Possible fragment spread
+ *
+ * A fragment spread is only valid if the type condition could ever possibly
+ * be true: if there is a non-empty intersection of the possible parent types,
+ * and possible types which pass the type condition.
+ */
+function PossibleFragmentSpreadsRule(context) {
+  return {
+    InlineFragment: function InlineFragment(node) {
+      var fragType = context.getType();
+      var parentType = context.getParentType();
+
+      if ((0, _definition.isCompositeType)(fragType) && (0, _definition.isCompositeType)(parentType) && !(0, _typeComparators.doTypesOverlap)(context.getSchema(), fragType, parentType)) {
+        var parentTypeStr = (0, _inspect.default)(parentType);
+        var fragTypeStr = (0, _inspect.default)(fragType);
+        context.reportError(new _GraphQLError.GraphQLError("Fragment cannot be spread here as objects of type \"".concat(parentTypeStr, "\" can never be of type \"").concat(fragTypeStr, "\"."), node));
+      }
+    },
+    FragmentSpread: function FragmentSpread(node) {
+      var fragName = node.name.value;
+      var fragType = getFragmentType(context, fragName);
+      var parentType = context.getParentType();
+
+      if (fragType && parentType && !(0, _typeComparators.doTypesOverlap)(context.getSchema(), fragType, parentType)) {
+        var parentTypeStr = (0, _inspect.default)(parentType);
+        var fragTypeStr = (0, _inspect.default)(fragType);
+        context.reportError(new _GraphQLError.GraphQLError("Fragment \"".concat(fragName, "\" cannot be spread here as objects of type \"").concat(parentTypeStr, "\" can never be of type \"").concat(fragTypeStr, "\"."), node));
+      }
+    }
+  };
+}
+
+function getFragmentType(context, name) {
+  var frag = context.getFragment(name);
+
+  if (frag) {
+    var type = (0, _typeFromAST.typeFromAST)(context.getSchema(), frag.typeCondition);
+
+    if ((0, _definition.isCompositeType)(type)) {
+      return type;
+    }
+  }
+}