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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;
}
}
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