47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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*/
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import type { ASTValidationContext } from '../ValidationContext';
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import { GraphQLError } from '../../error/GraphQLError';
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import type { ASTVisitor } from '../../language/visitor';
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export function duplicateOperationNameMessage(operationName: string): string {
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return `There can be only one operation named "${operationName}".`;
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}
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/**
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* Unique operation names
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*
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* A GraphQL document is only valid if all defined operations have unique names.
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*/
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export function UniqueOperationNames(
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context: ASTValidationContext,
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): ASTVisitor {
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const knownOperationNames = Object.create(null);
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return {
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OperationDefinition(node) {
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const operationName = node.name;
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if (operationName) {
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if (knownOperationNames[operationName.value]) {
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context.reportError(
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new GraphQLError(
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duplicateOperationNameMessage(operationName.value),
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[knownOperationNames[operationName.value], operationName],
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),
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);
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} else {
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knownOperationNames[operationName.value] = operationName;
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}
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}
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return false;
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},
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FragmentDefinition: () => false,
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};
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}
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