There are commands, eg. openssl s_client -checkend, which return:

• exit code 0 for True ("certificate is valid")
• exit code 1 for False ("certificate is invalid")
• exit code >1 for actual errors.

I'd like to be able to say smth like $`openssl s_client ...`.nothrow(out => out.exitCode <= 1) so that it still fails on genuine errors but lets me have true/false otherwise.

Right now I'm doing it like:

      await $`echo ${cert} | openssl x509 -noout -checkend ${86400 * 30}`.catch(err => {
        if (err.exitCode === 1) return err
        else throw err
      })