# Packages
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Package dyngo is the Go implementation of Datadog's Instrumentation Gateway which provides an event-based instrumentation API based on a stack representation of instrumented functions along with nested event listeners.
Package emitter provides functions and types used to instrument go libraries to integrate them with Datadog AppSec features.
Package listener provides functions and types used to listen to AppSec instrumentation events produced by code usintrumented using the functions and types found in github.com/nowfred/dd-trace-go/internal/appsec/emitter.
Package trace provides functions to annotate trace spans with AppSec related information.