flow like the river

VISUALIZACION/node_modules/graphql/validation/rules/UniqueEnumValueNamesRule.mjs

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+import { GraphQLError } from "../../error/GraphQLError.mjs";
+import { isEnumType } from "../../type/definition.mjs";
+
+/**
+ * Unique enum value names
+ *
+ * A GraphQL enum type is only valid if all its values are uniquely named.
+ */
+export function UniqueEnumValueNamesRule(context) {
+  var schema = context.getSchema();
+  var existingTypeMap = schema ? schema.getTypeMap() : Object.create(null);
+  var knownValueNames = Object.create(null);
+  return {
+    EnumTypeDefinition: checkValueUniqueness,
+    EnumTypeExtension: checkValueUniqueness
+  };
+
+  function checkValueUniqueness(node) {
+    var _node$values;
+
+    var typeName = node.name.value;
+
+    if (!knownValueNames[typeName]) {
+      knownValueNames[typeName] = Object.create(null);
+    } // istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2203')
+
+
+    var valueNodes = (_node$values = node.values) !== null && _node$values !== void 0 ? _node$values : [];
+    var valueNames = knownValueNames[typeName];
+
+    for (var _i2 = 0; _i2 < valueNodes.length; _i2++) {
+      var valueDef = valueNodes[_i2];
+      var valueName = valueDef.name.value;
+      var existingType = existingTypeMap[typeName];
+
+      if (isEnumType(existingType) && existingType.getValue(valueName)) {
+        context.reportError(new GraphQLError("Enum value \"".concat(typeName, ".").concat(valueName, "\" already exists in the schema. It cannot also be defined in this type extension."), valueDef.name));
+      } else if (valueNames[valueName]) {
+        context.reportError(new GraphQLError("Enum value \"".concat(typeName, ".").concat(valueName, "\" can only be defined once."), [valueNames[valueName], valueDef.name]));
+      } else {
+        valueNames[valueName] = valueDef.name;
+      }
+    }
+
+    return false;
+  }
+}