diff --git a/compat/compat.go b/compat/compat.go
new file mode 100644
index 0000000..58c84b6
--- /dev/null
+++ b/compat/compat.go
@@ -0,0 +1,19 @@
+package compat
+
+// CompatibilityFlag is a type that represents a compatibility flag.
+type CompatibilityFlag string
+
+// Compatibility flags.
+type CompatibilityFlags []CompatibilityFlag
+
+// Compatibility flags.
+const (
+	// NodeJS compatibility flag.
+	NodeJS CompatibilityFlag = "nodejs"
+)
+
+var Default = compatibilityFlags["2024-20-12"]
+
+var compatibilityFlags = map[string]CompatibilityFlags{
+	"2024-20-12": {NodeJS},
+}
diff --git a/go.mod b/go.mod
index ed3f4f9..1cc5084 100644
--- a/go.mod
+++ b/go.mod
@@ -7,6 +7,7 @@ toolchain go1.23.4
 require (
 	github.com/spf13/cobra v1.8.1
 	github.com/stretchr/testify v1.10.0
+	github.com/zeiss/pkg v0.1.19
 	github.com/zeiss/v8go-polyfills v0.0.0-20241126043451-29233cf876bf
 )
 
diff --git a/go.sum b/go.sum
index 05b717a..c1930e1 100644
--- a/go.sum
+++ b/go.sum
@@ -24,6 +24,8 @@ github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/zeiss/pkg v0.1.19 h1:xFhTEvpwDwv5vTU4K69QXcbdc1mKF/apSqSMF8r5Xc0=
+github.com/zeiss/pkg v0.1.19/go.mod h1:WCFpyj9/BrA1nWIabZGG8yn86aRy6RUzttD4tyRzJMw=
 github.com/zeiss/v8go-polyfills v0.0.0-20241126043451-29233cf876bf h1:HW7swZjrYm22vRfqCwlnPIdbbqvJJsDzZbetmR6B8+w=
 github.com/zeiss/v8go-polyfills v0.0.0-20241126043451-29233cf876bf/go.mod h1:i1pzNqoVMY1h3OQ5CJQ5xM1PybXysbpT0TTrGajDPGU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=