Function validateSchema

src/type/validate.ts:94–116

(
  schema: GraphQLSchema,
)

 * ```
 */
export function validateSchema(
  schema: GraphQLSchema,
): ReadonlyArray<GraphQLError> {
  // First check to ensure the provided value is in fact a GraphQLSchema.
  assertSchema(schema);

  // If this Schema has already been validated, return the previous results.
  if (schema.__validationErrors) {
    return schema.__validationErrors;
  }

  // Validate the schema, producing a list of errors.
  const context = new SchemaValidationContext(schema);
  validateRootTypes(context);
  validateDirectives(context);
  validateTypes(context);

  // Persist the results of validation before returning to ensure validation
  // does not run multiple times for this schema.
  const errors = context.getErrors();
  schema.__validationErrors = errors;
  return errors;
}

/**
 * Utility function which asserts a schema is valid by throwing an error if