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Contents
import { invariant } from '../../jsutils/invariant.mjs';
import { GraphQLError } from '../../error/GraphQLError.mjs';
/**
* Unique input field names
*
* A GraphQL input object value is only valid if all supplied fields are
* uniquely named.
*
* See https://spec.graphql.org/draft/#sec-Input-Object-Field-Uniqueness
*/
export function UniqueInputFieldNamesRule(context) {
const knownNameStack = [];
let knownNames = Object.create(null);
return {
ObjectValue: {
enter() {
knownNameStack.push(knownNames);
knownNames = Object.create(null);
},
leave() {
const prevKnownNames = knownNameStack.pop();
prevKnownNames || invariant(false);
knownNames = prevKnownNames;
},
},
ObjectField(node) {
const fieldName = node.name.value;
if (knownNames[fieldName]) {
context.reportError(
new GraphQLError(
`There can be only one input field named "${fieldName}".`,
{
nodes: [knownNames[fieldName], node.name],
},
),
);
} else {
knownNames[fieldName] = node.name;
}
},
};
}
Version data entries
26 entries across 26 versions & 1 rubygems