/
UniqueOperationTypesRule.ts
66 lines (58 loc) · 1.88 KB
/
UniqueOperationTypesRule.ts
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import { GraphQLError } from '../../error/GraphQLError';
import type {
SchemaDefinitionNode,
SchemaExtensionNode,
} from '../../language/ast';
import type { ASTVisitor } from '../../language/visitor';
import type { SDLValidationContext } from '../ValidationContext';
/**
* Unique operation types
*
* A GraphQL document is only valid if it has only one type per operation.
*/
export function UniqueOperationTypesRule(
context: SDLValidationContext,
): ASTVisitor {
const schema = context.getSchema();
const definedOperationTypes = Object.create(null);
const existingOperationTypes = schema
? {
query: schema.getQueryType(),
mutation: schema.getMutationType(),
subscription: schema.getSubscriptionType(),
}
: {};
return {
SchemaDefinition: checkOperationTypes,
SchemaExtension: checkOperationTypes,
};
function checkOperationTypes(
node: SchemaDefinitionNode | SchemaExtensionNode,
) {
// See: https://github.com/graphql/graphql-js/issues/2203
/* c8 ignore next */
const operationTypesNodes = node.operationTypes ?? [];
for (const operationType of operationTypesNodes) {
const operation = operationType.operation;
const alreadyDefinedOperationType = definedOperationTypes[operation];
if (existingOperationTypes[operation]) {
context.reportError(
new GraphQLError(
`Type for ${operation} already defined in the schema. It cannot be redefined.`,
{ nodes: operationType },
),
);
} else if (alreadyDefinedOperationType) {
context.reportError(
new GraphQLError(
`There can be only one ${operation} type in schema.`,
{ nodes: [alreadyDefinedOperationType, operationType] },
),
);
} else {
definedOperationTypes[operation] = operationType;
}
}
return false;
}
}