@theguild/federation-composition/esm/subgraph/validation/rules/unique-argument-definition-names-rule.js

Open Source Composition library for Apollo Federation

import { GraphQLError, } from 'graphql';
export function UniqueArgumentDefinitionNamesRule(context) {
    return {
        DirectiveDefinition(directiveNode) {
            const argumentNodes = directiveNode.arguments ?? [];
            return checkArgUniqueness(`@${directiveNode.name.value}`, argumentNodes);
        },
        InterfaceTypeDefinition: checkArgUniquenessPerField,
        InterfaceTypeExtension: checkArgUniquenessPerField,
        ObjectTypeDefinition: checkArgUniquenessPerField,
        ObjectTypeExtension: checkArgUniquenessPerField,
    };
    function checkArgUniquenessPerField(typeNode) {
        const typeName = typeNode.name.value;
        const fieldNodes = typeNode.fields ?? [];
        for (const fieldDef of fieldNodes) {
            const fieldName = fieldDef.name.value;
            const argumentNodes = fieldDef.arguments ?? [];
            checkArgUniqueness(`${typeName}.${fieldName}`, argumentNodes);
        }
        return false;
    }
    function checkArgUniqueness(parentName, argumentNodes) {
        const visitedArgumentNames = new Set();
        for (const argDef of argumentNodes) {
            if (visitedArgumentNames.has(argDef.name.value)) {
                context.reportError(new GraphQLError(`Argument "${parentName}(${argDef.name.value}:)" can only be defined once.`, {
                    extensions: {
                        code: 'INVALID_GRAPHQL',
                    },
                }));
            }
            else {
                visitedArgumentNames.add(argDef.name.value);
            }
        }
    }
}