app

type App interface {
	// Start kicks off the application and returns immediately.
	// Start should only be called once.
	Start() error

	// Stop notifies the application to exit and returns immediately.
	// Stop should only be called after [Start].
	// It is safe to call Stop multiple times.
	Stop() error

	// ExitCode should only be called after [Start] returns with no error. It
	// should block until the application finishes
	ExitCode() (int, error)
}