graphql/validation/rules/UniqueInputFieldNamesRule.mjs

A Query Language and Runtime which can target any service.

import { invariant } from "../../jsutils/invariant.mjs";
import { GraphQLError } from "../../error/GraphQLError.mjs";
export function UniqueInputFieldNamesRule(context) {
    const knownNameStack = [];
    let knownNames = new Map();
    return {
        ObjectValue: {
            enter() {
                knownNameStack.push(knownNames);
                knownNames = new Map();
            },
            leave() {
                const prevKnownNames = knownNameStack.pop();
                if (!(prevKnownNames != null))
                    invariant(false);
                knownNames = prevKnownNames;
            },
        },
        ObjectField(node) {
            const fieldName = node.name.value;
            const knownName = knownNames.get(fieldName);
            if (knownName != null) {
                context.reportError(new GraphQLError(`There can be only one input field named "${fieldName}".`, { nodes: [knownName, node.name] }));
            }
            else {
                knownNames.set(fieldName, node.name);
            }
        },
    };
}
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