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- import { GraphQLError } from '../../error/GraphQLError';
- import { type ASTVisitor } from '../../language/visitor';
- import { type ASTValidationContext } from '../ValidationContext';
- export function duplicateOperationNameMessage(operationName: string): string {
- return `There can be only one operation named "${operationName}".`;
- }
- export function UniqueOperationNames(
- context: ASTValidationContext,
- ): ASTVisitor {
- const knownOperationNames = Object.create(null);
- return {
- OperationDefinition(node) {
- const operationName = node.name;
- if (operationName) {
- if (knownOperationNames[operationName.value]) {
- context.reportError(
- new GraphQLError(
- duplicateOperationNameMessage(operationName.value),
- [knownOperationNames[operationName.value], operationName],
- ),
- );
- } else {
- knownOperationNames[operationName.value] = operationName;
- }
- }
- return false;
- },
- FragmentDefinition: () => false,
- };
- }
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