@theguild/federation-composition
Version:
Open Source Composition library for Apollo Federation
37 lines (36 loc) • 1.42 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.UniqueFieldDefinitionNamesRule = UniqueFieldDefinitionNamesRule;
const graphql_1 = require("graphql");
function UniqueFieldDefinitionNamesRule(context) {
const knownFieldNames = new Map();
return {
InputObjectTypeDefinition: checkFieldUniqueness,
InputObjectTypeExtension: checkFieldUniqueness,
InterfaceTypeDefinition: checkFieldUniqueness,
InterfaceTypeExtension: checkFieldUniqueness,
ObjectTypeDefinition: checkFieldUniqueness,
ObjectTypeExtension: checkFieldUniqueness,
};
function checkFieldUniqueness(node) {
const typeName = node.name.value;
if (!knownFieldNames.has(typeName)) {
knownFieldNames.set(typeName, new Set());
}
const fieldNodes = node.fields ?? [];
const fieldNames = knownFieldNames.get(typeName);
for (const fieldDef of fieldNodes) {
const fieldName = fieldDef.name.value;
if (fieldNames.has(fieldName)) {
context.reportError(new graphql_1.GraphQLError(`Field "${typeName}.${fieldName}" can only be defined once.`, {
extensions: {
code: 'INVALID_GRAPHQL',
},
}));
}
else {
fieldNames.add(fieldName);
}
}
}
}