35 lines
883 B
JavaScript
35 lines
883 B
JavaScript
import { GraphQLError } from '../../error/GraphQLError.mjs';
|
|
|
|
/**
|
|
* Unique fragment names
|
|
*
|
|
* A GraphQL document is only valid if all defined fragments have unique names.
|
|
*
|
|
* See https://spec.graphql.org/draft/#sec-Fragment-Name-Uniqueness
|
|
*/
|
|
export function UniqueFragmentNamesRule(context) {
|
|
const knownFragmentNames = Object.create(null);
|
|
return {
|
|
OperationDefinition: () => false,
|
|
|
|
FragmentDefinition(node) {
|
|
const fragmentName = node.name.value;
|
|
|
|
if (knownFragmentNames[fragmentName]) {
|
|
context.reportError(
|
|
new GraphQLError(
|
|
`There can be only one fragment named "${fragmentName}".`,
|
|
{
|
|
nodes: [knownFragmentNames[fragmentName], node.name],
|
|
},
|
|
),
|
|
);
|
|
} else {
|
|
knownFragmentNames[fragmentName] = node.name;
|
|
}
|
|
|
|
return false;
|
|
},
|
|
};
|
|
}
|