Remove assertion related codes on production environment

[Katashin]

Maybe should implement another package like unassert?

[Katashin]

It would not worth implementing dedicated unassert-like tool, just use process.env.NODE_ENV !== 'production' pattern is enough.

const module = {
  state: { /* .... */ },
  // ...
}

if (process.env.NODE_ENV !== 'production') {
  module.assertions = { /* ... */ }
}

export default module