43 lines
1.2 KiB
Plaintext
43 lines
1.2 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 duplicateFragmentNameMessage(fragName: string): string {
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return `There can be only one fragment named "${fragName}".`;
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}
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/**
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* Unique fragment names
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*
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* A GraphQL document is only valid if all defined fragments have unique names.
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*/
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export function UniqueFragmentNames(context: ASTValidationContext): ASTVisitor {
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const knownFragmentNames = Object.create(null);
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return {
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OperationDefinition: () => false,
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FragmentDefinition(node) {
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const fragmentName = node.name.value;
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if (knownFragmentNames[fragmentName]) {
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context.reportError(
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new GraphQLError(duplicateFragmentNameMessage(fragmentName), [
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knownFragmentNames[fragmentName],
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node.name,
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]),
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);
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} else {
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knownFragmentNames[fragmentName] = node.name;
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}
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return false;
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},
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};
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}
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