task

type Context struct {
	Context context.Context

	Stdin  io.Reader
	Stdout io.Writer
	Stderr io.Writer
	Obj    cue.Value
	Err    errors.Error
}

type Runner interface {

	// Runner runs given the current value and returns a new value which is to
	// be unified with the original result.
	Run(ctx *Context) (results interface{}, err error)
}

type RunnerFunc func(v cue.Value) (Runner, error)