old_contents: // @flow
  
  import {Base} from 'cli-engine-command'
  
  export default class NotFound extends Base {
    async run () {
      throw new Error(`${this.color.yellow(this.config.argv[1])} is not a heroku command.
  Perhaps you meant ????
  Run ${this.color.cmd('heroku help')} for a list of available commands.`)
    }
  }
  
new_contents: // @flow
  
  import {Base} from 'cli-engine-command'
  
  export default class NotFound extends Base {
    async run () {
      this.error(`${this.color.yellow(this.config.argv[1])} is not a heroku command.
  Perhaps you meant ????
  Run ${this.color.cmd('heroku help')} for a list of available commands.`, 127)
    }
  }
  
subject: exit with 127