planning

node_modules/graphql/validation/rules/UniqueFieldDefinitionNamesRule.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.UniqueFieldDefinitionNamesRule = UniqueFieldDefinitionNamesRule;
+
+var _GraphQLError = require("../../error/GraphQLError.js");
+
+var _definition = require("../../type/definition.js");
+
+/**
+ * Unique field definition names
+ *
+ * A GraphQL complex type is only valid if all its fields are uniquely named.
+ */
+function UniqueFieldDefinitionNamesRule(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 _node$fields;
+
+    var typeName = node.name.value;
+
+    if (!knownFieldNames[typeName]) {
+      knownFieldNames[typeName] = Object.create(null);
+    } // istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2203')
+
+
+    var fieldNodes = (_node$fields = node.fields) !== null && _node$fields !== void 0 ? _node$fields : [];
+    var fieldNames = knownFieldNames[typeName];
+
+    for (var _i2 = 0; _i2 < fieldNodes.length; _i2++) {
+      var fieldDef = fieldNodes[_i2];
+      var fieldName = fieldDef.name.value;
+
+      if (hasField(existingTypeMap[typeName], fieldName)) {
+        context.reportError(new _GraphQLError.GraphQLError("Field \"".concat(typeName, ".").concat(fieldName, "\" already exists in the schema. It cannot also be defined in this type extension."), fieldDef.name));
+      } else if (fieldNames[fieldName]) {
+        context.reportError(new _GraphQLError.GraphQLError("Field \"".concat(typeName, ".").concat(fieldName, "\" can only be defined once."), [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] != null;
+  }
+
+  return false;
+}