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79 lines
2.2 KiB
79 lines
2.2 KiB
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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/** |
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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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