@graphql-tools/graphql
Version:
Fork of GraphQL.js
57 lines (56 loc) • 2.52 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.UniqueFieldDefinitionNamesRule = void 0;
const GraphQLError_js_1 = require("../../error/GraphQLError.js");
const definition_js_1 = require("../../type/definition.js");
/**
* Unique field definition names
*
* A GraphQL complex type is only valid if all its fields are uniquely named.
*/
function UniqueFieldDefinitionNamesRule(context) {
const schema = context.getSchema();
const existingTypeMap = schema ? schema.getTypeMap() : Object.create(null);
const knownFieldNames = Object.create(null);
return {
InputObjectTypeDefinition: checkFieldUniqueness,
InputObjectTypeExtension: checkFieldUniqueness,
InterfaceTypeDefinition: checkFieldUniqueness,
InterfaceTypeExtension: checkFieldUniqueness,
ObjectTypeDefinition: checkFieldUniqueness,
ObjectTypeExtension: checkFieldUniqueness,
};
function checkFieldUniqueness(node) {
var _a;
const typeName = node.name.value;
if (!knownFieldNames[typeName]) {
knownFieldNames[typeName] = Object.create(null);
}
// FIXME: https://github.com/graphql/graphql-js/issues/2203
/* c8 ignore next */
const fieldNodes = (_a = node.fields) !== null && _a !== void 0 ? _a : [];
const fieldNames = knownFieldNames[typeName];
for (const fieldDef of fieldNodes) {
const fieldName = fieldDef.name.value;
if (hasField(existingTypeMap[typeName], fieldName)) {
context.reportError(new GraphQLError_js_1.GraphQLError(`Field "${typeName}.${fieldName}" already exists in the schema. It cannot also be defined in this type extension.`, { nodes: fieldDef.name }));
}
else if (fieldNames[fieldName]) {
context.reportError(new GraphQLError_js_1.GraphQLError(`Field "${typeName}.${fieldName}" can only be defined once.`, {
nodes: [fieldNames[fieldName], fieldDef.name],
}));
}
else {
fieldNames[fieldName] = fieldDef.name;
}
}
return false;
}
}
exports.UniqueFieldDefinitionNamesRule = UniqueFieldDefinitionNamesRule;
function hasField(type, fieldName) {
if ((0, definition_js_1.isObjectType)(type) || (0, definition_js_1.isInterfaceType)(type) || (0, definition_js_1.isInputObjectType)(type)) {
return type.getFields()[fieldName] != null;
}
return false;
}