js

func NewJsTracer ¶

func NewJsTracer(code string, ctx *tracers.Context, cfg json.RawMessage) (tracers.Tracer, error)

newJsTracer instantiates a new JS tracer instance. code is a Javascript snippet which evaluates to an expression returning an object with certain methods:

The methods `result` and `fault` are required to be present. The methods `step`, `enter`, and `exit` are optional, but note that `enter` and `exit` always go together.