diff --git a/src/webzen/entity/entity.go b/src/webzen/entity/entity.go
new file mode 100644
index 0000000..3a8cf54
--- /dev/null
+++ b/src/webzen/entity/entity.go
@@ -0,0 +1,4 @@
+//go:build js && wasm
+// +build js,wasm
+
+package entity
diff --git a/src/webzen/vector/vector.go b/src/webzen/vector/vector.go
new file mode 100644
index 0000000..10fe449
--- /dev/null
+++ b/src/webzen/vector/vector.go
@@ -0,0 +1,13 @@
+//go:build js && wasm
+// +build js,wasm
+
+package vector
+
+type Vector2D struct {
+  x int
+  y int
+}
+
+func NewVector2D(x, y int) Vector2D {
+  return Vector2D{x, y}
+}