Break utils package into subpackages.

internal/utils/must/must.go

@@ -0,0 +1,41 @@
+package must
+
+import (
+	"github.com/go-jet/jet/v2/internal/utils/is"
+	"reflect"
+)
+
+// BeTrue panics when condition is false
+func BeTrue(condition bool, errorStr string) {
+	if !condition {
+		panic(errorStr)
+	}
+}
+
+// BeTypeKind panics with errorStr error, if v interface is not of reflect kind
+func BeTypeKind(v interface{}, kind reflect.Kind, errorStr string) {
+	if reflect.TypeOf(v).Kind() != kind {
+		panic(errorStr)
+	}
+}
+
+// ValueBeOfTypeKind panics with errorStr error, if v value is not of reflect kind
+func ValueBeOfTypeKind(v reflect.Value, kind reflect.Kind, errorStr string) {
+	if v.Kind() != kind {
+		panic(errorStr)
+	}
+}
+
+// TypeBeOfKind panics with errorStr error, if v type is not of reflect kind
+func TypeBeOfKind(v reflect.Type, kind reflect.Kind, errorStr string) {
+	if v.Kind() != kind {
+		panic(errorStr)
+	}
+}
+
+// BeInitializedPtr panics with errorStr if val interface is nil
+func BeInitializedPtr(val interface{}, errorStr string) {
+	if is.Nil(val) {
+		panic(errorStr)
+	}
+}