| import { invariant } from '../../jsutils/invariant.mjs'; |
| import { GraphQLError } from '../../error/GraphQLError.mjs'; |
| |
| /** |
| * Unique input field names |
| * |
| * A GraphQL input object value is only valid if all supplied fields are |
| * uniquely named. |
| * |
| * See https://spec.graphql.org/draft/#sec-Input-Object-Field-Uniqueness |
| */ |
| export function UniqueInputFieldNamesRule(context) { |
| const knownNameStack = []; |
| let knownNames = Object.create(null); |
| return { |
| ObjectValue: { |
| enter() { |
| knownNameStack.push(knownNames); |
| knownNames = Object.create(null); |
| }, |
| |
| leave() { |
| const prevKnownNames = knownNameStack.pop(); |
| prevKnownNames || invariant(false); |
| knownNames = prevKnownNames; |
| }, |
| }, |
| |
| ObjectField(node) { |
| const fieldName = node.name.value; |
| |
| if (knownNames[fieldName]) { |
| context.reportError( |
| new GraphQLError( |
| `There can be only one input field named "${fieldName}".`, |
| { |
| nodes: [knownNames[fieldName], node.name], |
| }, |
| ), |
| ); |
| } else { |
| knownNames[fieldName] = node.name; |
| } |
| }, |
| }; |
| } |