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