diff --git a/pkg.go b/pkg.go
new file mode 100644
index 0000000..51bb964
--- /dev/null
+++ b/pkg.go
@@ -0,0 +1,11 @@
+package x
+
+import (
+	"errors"
+)
+
+func Assert(cond bool, msg string) {
+	if cond {
+		panic(errors.New(msg))
+	}
+}