I think there is an error in the migration guide here in the code block: https://docs.serverless-stack.com/constructs/v0/migration#default-settings Instead of

// to
{
  defaults: {
    functionProps: { timeout: 10 },

it should be

// to
{
  defaults: {
    function: { timeout: 10 },

Or at least I get a complaint in the console with the former, but not the latter setup

Thanks @Adrian Schweizer! Fixed.