const { parse, validate, contextFactory, execute, schema } = getEnveloped({ req })

const { query, variables } = JSON.parse(payload)

try {
  const document = parse(query)
} catch (err) {
  return { errors: [err] }
}

const validationErrors = validate(schema, document)
if (validationErrors.length > 0) {
  return { errors: validationErrors }
}

const context = await contextFactory(req)
const result = await execute({
  document,
  schema,
  variableValues: variables,
  contextValue: context
})

return result

const { perform } = getEnveloped({ req });

const { operationName, query, variables, extensions } = JSON.parse(payload);

const result = await perform({ operationName, query, variables, extensions });

return JSON.stringify(result);