45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
import { groupBy } from '../../jsutils/groupBy.mjs';
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import { GraphQLError } from '../../error/GraphQLError.mjs';
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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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* See https://spec.graphql.org/draft/#sec-Argument-Names
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*/
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export function UniqueArgumentNamesRule(context) {
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return {
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Field: checkArgUniqueness,
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Directive: checkArgUniqueness,
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};
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function checkArgUniqueness(parentNode) {
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var _parentNode$arguments;
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// FIXME: https://github.com/graphql/graphql-js/issues/2203
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/* c8 ignore next */
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const argumentNodes =
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(_parentNode$arguments = parentNode.arguments) !== null &&
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_parentNode$arguments !== void 0
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? _parentNode$arguments
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: [];
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const seenArgs = groupBy(argumentNodes, (arg) => arg.name.value);
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for (const [argName, argNodes] of seenArgs) {
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if (argNodes.length > 1) {
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context.reportError(
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new GraphQLError(
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`There can be only one argument named "${argName}".`,
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{
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nodes: argNodes.map((node) => node.name),
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},
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),
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);
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}
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}
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}
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}
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