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node_modules/graphql/validation/rules/UniqueFieldDefinitionNames.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.duplicateFieldDefinitionNameMessage = duplicateFieldDefinitionNameMessage;
+exports.existedFieldDefinitionNameMessage = existedFieldDefinitionNameMessage;
+exports.UniqueFieldDefinitionNames = UniqueFieldDefinitionNames;
+
+var _GraphQLError = require("../../error/GraphQLError");
+
+var _definition = require("../../type/definition");
+
+function duplicateFieldDefinitionNameMessage(typeName, fieldName) {
+  return "Field \"".concat(typeName, ".").concat(fieldName, "\" can only be defined once.");
+}
+
+function existedFieldDefinitionNameMessage(typeName, fieldName) {
+  return "Field \"".concat(typeName, ".").concat(fieldName, "\" already exists in the schema. It cannot also be defined in this type extension.");
+}
+/**
+ * Unique field definition names
+ *
+ * A GraphQL complex type is only valid if all its fields are uniquely named.
+ */
+
+
+function UniqueFieldDefinitionNames(context) {
+  var schema = context.getSchema();
+  var existingTypeMap = schema ? schema.getTypeMap() : Object.create(null);
+  var knownFieldNames = Object.create(null);
+  return {
+    InputObjectTypeDefinition: checkFieldUniqueness,
+    InputObjectTypeExtension: checkFieldUniqueness,
+    InterfaceTypeDefinition: checkFieldUniqueness,
+    InterfaceTypeExtension: checkFieldUniqueness,
+    ObjectTypeDefinition: checkFieldUniqueness,
+    ObjectTypeExtension: checkFieldUniqueness
+  };
+
+  function checkFieldUniqueness(node) {
+    var typeName = node.name.value;
+
+    if (!knownFieldNames[typeName]) {
+      knownFieldNames[typeName] = Object.create(null);
+    }
+
+    if (node.fields) {
+      var fieldNames = knownFieldNames[typeName];
+
+      for (var _i2 = 0, _node$fields2 = node.fields; _i2 < _node$fields2.length; _i2++) {
+        var fieldDef = _node$fields2[_i2];
+        var fieldName = fieldDef.name.value;
+
+        if (hasField(existingTypeMap[typeName], fieldName)) {
+          context.reportError(new _GraphQLError.GraphQLError(existedFieldDefinitionNameMessage(typeName, fieldName), fieldDef.name));
+        } else if (fieldNames[fieldName]) {
+          context.reportError(new _GraphQLError.GraphQLError(duplicateFieldDefinitionNameMessage(typeName, fieldName), [fieldNames[fieldName], fieldDef.name]));
+        } else {
+          fieldNames[fieldName] = fieldDef.name;
+        }
+      }
+    }
+
+    return false;
+  }
+}
+
+function hasField(type, fieldName) {
+  if ((0, _definition.isObjectType)(type) || (0, _definition.isInterfaceType)(type) || (0, _definition.isInputObjectType)(type)) {
+    return type.getFields()[fieldName];
+  }
+
+  return false;
+}