65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
import { GraphQLError } from '../../error/GraphQLError.mjs';
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import { isEnumType } from '../../type/definition.mjs';
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/**
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* Unique enum value names
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*
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* A GraphQL enum type is only valid if all its values are uniquely named.
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*/
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export function UniqueEnumValueNamesRule(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 knownValueNames = Object.create(null);
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return {
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EnumTypeDefinition: checkValueUniqueness,
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EnumTypeExtension: checkValueUniqueness,
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};
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function checkValueUniqueness(node) {
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var _node$values;
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const typeName = node.name.value;
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if (!knownValueNames[typeName]) {
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knownValueNames[typeName] = Object.create(null);
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} // FIXME: https://github.com/graphql/graphql-js/issues/2203
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/* c8 ignore next */
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const valueNodes =
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(_node$values = node.values) !== null && _node$values !== void 0
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? _node$values
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: [];
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const valueNames = knownValueNames[typeName];
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for (const valueDef of valueNodes) {
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const valueName = valueDef.name.value;
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const existingType = existingTypeMap[typeName];
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if (isEnumType(existingType) && existingType.getValue(valueName)) {
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context.reportError(
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new GraphQLError(
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`Enum value "${typeName}.${valueName}" already exists in the schema. It cannot also be defined in this type extension.`,
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{
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nodes: valueDef.name,
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},
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),
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);
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} else if (valueNames[valueName]) {
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context.reportError(
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new GraphQLError(
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`Enum value "${typeName}.${valueName}" can only be defined once.`,
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{
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nodes: [valueNames[valueName], valueDef.name],
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},
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),
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);
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} else {
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valueNames[valueName] = valueDef.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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