graphql/validation/rules/UniqueEnumValueNamesRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
import { isEnumType } from "../../type/definition.mjs";
export function UniqueEnumValueNamesRule(context) {
    const schema = context.getSchema();
    const existingTypeMap = schema ? schema.getTypeMap() : Object.create(null);
    const knownValueNames = new Map();
    return {
        EnumTypeDefinition: checkValueUniqueness,
        EnumTypeExtension: checkValueUniqueness,
    };
    function checkValueUniqueness(node) {
        const typeName = node.name.value;
        let valueNames = knownValueNames.get(typeName);
        if (valueNames == null) {
            valueNames = new Map();
            knownValueNames.set(typeName, valueNames);
        }
        const valueNodes = node.values ?? [];
        for (const valueDef of valueNodes) {
            const valueName = valueDef.name.value;
            const existingType = existingTypeMap[typeName];
            if (isEnumType(existingType) && existingType.getValue(valueName)) {
                context.reportError(new GraphQLError(`Enum value "${typeName}.${valueName}" already exists in the schema. It cannot also be defined in this type extension.`, { nodes: valueDef.name }));
                continue;
            }
            const knownValueName = valueNames.get(valueName);
            if (knownValueName != null) {
                context.reportError(new GraphQLError(`Enum value "${typeName}.${valueName}" can only be defined once.`, { nodes: [knownValueName, valueDef.name] }));
            }
            else {
                valueNames.set(valueName, valueDef.name);
            }
        }
        return false;
    }
}
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