49 lines
1.3 KiB
Plaintext
49 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 duplicateArgMessage(argName: string): string {
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return `There can be only one argument named "${argName}".`;
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}
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/**
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* Unique argument names
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*
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* A GraphQL field or directive is only valid if all supplied arguments are
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* uniquely named.
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*/
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export function UniqueArgumentNames(context: ASTValidationContext): ASTVisitor {
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let knownArgNames = Object.create(null);
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return {
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Field() {
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knownArgNames = Object.create(null);
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},
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Directive() {
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knownArgNames = Object.create(null);
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},
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Argument(node) {
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const argName = node.name.value;
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if (knownArgNames[argName]) {
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context.reportError(
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new GraphQLError(duplicateArgMessage(argName), [
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knownArgNames[argName],
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node.name,
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]),
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);
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} else {
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knownArgNames[argName] = 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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