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authorMinteck <contact@minteck.org>2023-01-10 14:54:04 +0100
committerMinteck <contact@minteck.org>2023-01-10 14:54:04 +0100
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Update - This is an automated commit
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+// @flow strict
+import { GraphQLError } from '../../error/GraphQLError';
+
+import type { ASTVisitor } from '../../language/visitor';
+
+import type { ASTValidationContext } from '../ValidationContext';
+
+/**
+ * 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.
+ */
+export function NoUnusedFragmentsRule(
+ context: ASTValidationContext,
+): ASTVisitor {
+ 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.`,
+ fragmentDef,
+ ),
+ );
+ }
+ }
+ },
+ },
+ };
+}