| import { GraphQLError } from '../../error/GraphQLError.mjs'; |
| import { print } from '../../language/printer.mjs'; |
| import { isCompositeType } from '../../type/definition.mjs'; |
| import { typeFromAST } from '../../utilities/typeFromAST.mjs'; |
| |
| /** |
| * Fragments on composite type |
| * |
| * Fragments use a type condition to determine if they apply, since fragments |
| * can only be spread into a composite type (object, interface, or union), the |
| * type condition must also be a composite type. |
| * |
| * See https://spec.graphql.org/draft/#sec-Fragments-On-Composite-Types |
| */ |
| export function FragmentsOnCompositeTypesRule(context) { |
| return { |
| InlineFragment(node) { |
| const typeCondition = node.typeCondition; |
| |
| if (typeCondition) { |
| const type = typeFromAST(context.getSchema(), typeCondition); |
| |
| if (type && !isCompositeType(type)) { |
| const typeStr = print(typeCondition); |
| context.reportError( |
| new GraphQLError( |
| `Fragment cannot condition on non composite type "${typeStr}".`, |
| { |
| nodes: typeCondition, |
| }, |
| ), |
| ); |
| } |
| } |
| }, |
| |
| FragmentDefinition(node) { |
| const type = typeFromAST(context.getSchema(), node.typeCondition); |
| |
| if (type && !isCompositeType(type)) { |
| const typeStr = print(node.typeCondition); |
| context.reportError( |
| new GraphQLError( |
| `Fragment "${node.name.value}" cannot condition on non composite type "${typeStr}".`, |
| { |
| nodes: node.typeCondition, |
| }, |
| ), |
| ); |
| } |
| }, |
| }; |
| } |