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// @flow strict
import { GraphQLError } from '../../error/GraphQLError';
import type { ASTVisitor } from '../../language/visitor';
import type {
EnumTypeDefinitionNode,
EnumTypeExtensionNode,
} from '../../language/ast';
import { isEnumType } from '../../type/definition';
import type { SDLValidationContext } from '../ValidationContext';
/**
* Unique enum value names
*
* A GraphQL enum type is only valid if all its values are uniquely named.
*/
export function UniqueEnumValueNamesRule(
context: SDLValidationContext,
): ASTVisitor {
const schema = context.getSchema();
const existingTypeMap = schema ? schema.getTypeMap() : Object.create(null);
const knownValueNames = Object.create(null);
return {
EnumTypeDefinition: checkValueUniqueness,
EnumTypeExtension: checkValueUniqueness,
};
function checkValueUniqueness(
node: EnumTypeDefinitionNode | EnumTypeExtensionNode,
) {
const typeName = node.name.value;
if (!knownValueNames[typeName]) {
knownValueNames[typeName] = Object.create(null);
}
// istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2203')
const valueNodes = node.values ?? [];
const valueNames = knownValueNames[typeName];
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.`,
valueDef.name,
),
);
} else if (valueNames[valueName]) {
context.reportError(
new GraphQLError(
`Enum value "${typeName}.${valueName}" can only be defined once.`,
[valueNames[valueName], valueDef.name],
),
);
} else {
valueNames[valueName] = valueDef.name;
}
}
return false;
}
}
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