import { GraphQLError } from '../../error/GraphQLError.mjs'; /** * No unused fragments * * A GraphQL document is only valid if all fragment definitions are spread * within operations, or spread within other fragments spread within operations. * * See https://spec.graphql.org/draft/#sec-Fragments-Must-Be-Used */ export function NoUnusedFragmentsRule(context) { const operationDefs = []; const fragmentDefs = []; return { OperationDefinition(node) { operationDefs.push(node); return false; }, FragmentDefinition(node) { fragmentDefs.push(node); return false; }, Document: { leave() { const fragmentNameUsed = Object.create(null); for (const operation of operationDefs) { for (const fragment of context.getRecursivelyReferencedFragments( operation, )) { fragmentNameUsed[fragment.name.value] = true; } } for (const fragmentDef of fragmentDefs) { const fragName = fragmentDef.name.value; if (fragmentNameUsed[fragName] !== true) { context.reportError( new GraphQLError(`Fragment "${fragName}" is never used.`, { nodes: fragmentDef, }), ); } } }, }, }; }