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46 lines
1.1 KiB
46 lines
1.1 KiB
import { invariant } from '../../jsutils/invariant.mjs'; |
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import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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/** |
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* Unique input field names |
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* |
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* A GraphQL input object value is only valid if all supplied fields are |
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* uniquely named. |
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* |
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* See https://spec.graphql.org/draft/#sec-Input-Object-Field-Uniqueness |
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*/ |
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export function UniqueInputFieldNamesRule(context) { |
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const knownNameStack = []; |
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let knownNames = Object.create(null); |
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return { |
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ObjectValue: { |
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enter() { |
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knownNameStack.push(knownNames); |
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knownNames = Object.create(null); |
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}, |
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leave() { |
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const prevKnownNames = knownNameStack.pop(); |
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prevKnownNames || invariant(false); |
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knownNames = prevKnownNames; |
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}, |
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}, |
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ObjectField(node) { |
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const fieldName = node.name.value; |
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if (knownNames[fieldName]) { |
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context.reportError( |
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new GraphQLError( |
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`There can be only one input field named "${fieldName}".`, |
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{ |
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nodes: [knownNames[fieldName], node.name], |
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}, |
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), |
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); |
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} else { |
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knownNames[fieldName] = node.name; |
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} |
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}, |
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}; |
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}
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