| /** @category Validation Rules */ |
| 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. |
| * @param context - The validation context used while checking the document. |
| * @returns A visitor that reports validation errors for this rule. |
| * @example |
| * ```ts |
| * import { buildSchema } from 'graphql'; |
| * import { UniqueEnumValueNamesRule } from 'graphql/validation'; |
| * |
| * const invalidSDL = ` |
| * enum Status { ACTIVE ACTIVE } type Query { status: Status } |
| * `; |
| * |
| * UniqueEnumValueNamesRule.name; // => 'UniqueEnumValueNamesRule' |
| * buildSchema(invalidSDL); // throws an error |
| * |
| * const validSDL = ` |
| * enum Status { ACTIVE INACTIVE } type Query { status: Status } |
| * `; |
| * |
| * buildSchema(validSDL); // does not throw |
| * ``` |
| */ |
| export function UniqueEnumValueNamesRule(context) { |
| const schema = context.getSchema(); |
| const existingTypeMap = schema ? schema.getTypeMap() : Object.create(null); |
| const knownValueNames = Object.create(null); |
| return { |
| EnumTypeDefinition: checkValueUniqueness, |
| EnumTypeExtension: checkValueUniqueness, |
| }; |
| |
| function checkValueUniqueness(node) { |
| var _node$values; |
| |
| const typeName = node.name.value; |
| |
| if (!knownValueNames[typeName]) { |
| knownValueNames[typeName] = Object.create(null); |
| } // FIXME: https://github.com/graphql/graphql-js/issues/2203 |
| |
| /* c8 ignore next */ |
| |
| const valueNodes = |
| (_node$values = node.values) !== null && _node$values !== void 0 |
| ? _node$values |
| : []; |
| const valueNames = knownValueNames[typeName]; |
| |
| for (const valueDef of valueNodes) { |
| const valueName = valueDef.name.value; |
| const existingType = existingTypeMap[typeName]; |
| |
| if (isEnumType(existingType) && existingType.getValue(valueName)) { |
| context.reportError( |
| new GraphQLError( |
| `Enum value "${typeName}.${valueName}" already exists in the schema. It cannot also be defined in this type extension.`, |
| { |
| nodes: valueDef.name, |
| }, |
| ), |
| ); |
| } else if (valueNames[valueName]) { |
| context.reportError( |
| new GraphQLError( |
| `Enum value "${typeName}.${valueName}" can only be defined once.`, |
| { |
| nodes: [valueNames[valueName], valueDef.name], |
| }, |
| ), |
| ); |
| } else { |
| valueNames[valueName] = valueDef.name; |
| } |
| } |
| |
| return false; |
| } |
| } |