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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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tree75be5fba4368472fb11c8015aee026b2b9a71888 /includes/external/school/node_modules/graphql/validation/rules/SingleFieldSubscriptionsRule.js.flow
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+// @flow strict
+import { GraphQLError } from '../../error/GraphQLError';
+
+import type { ASTVisitor } from '../../language/visitor';
+import type { OperationDefinitionNode } from '../../language/ast';
+
+import type { ASTValidationContext } from '../ValidationContext';
+
+/**
+ * Subscriptions must only include one field.
+ *
+ * A GraphQL subscription is valid only if it contains a single root field.
+ */
+export function SingleFieldSubscriptionsRule(
+ context: ASTValidationContext,
+): ASTVisitor {
+ return {
+ OperationDefinition(node: OperationDefinitionNode) {
+ if (node.operation === 'subscription') {
+ if (node.selectionSet.selections.length !== 1) {
+ context.reportError(
+ new GraphQLError(
+ node.name
+ ? `Subscription "${node.name.value}" must select only one top level field.`
+ : 'Anonymous Subscription must select only one top level field.',
+ node.selectionSet.selections.slice(1),
+ ),
+ );
+ }
+ }
+ },
+ };
+}