1 files changed, 13 insertions, 0 deletions
diff --git a/src/platform/web/Js.cpp b/src/platform/web/Js.cpp
new file mode 100644
index 00000000..ea8a0d68
--- /dev/null
+++ b/src/platform/web/Js.cpp
@@ -0,0 +1,13 @@
+#include "cru/platform/web/Js.h"
+
+namespace cru::platform::web {
+bool IsNotNullAndInstanceOf(const emscripten::val& value,
+                            const emscripten::val& type) {
+  return !value.isNull() && !type.isNull() && value.instanceof (type);
+}
+
+bool IsNotNullAndInstanceOf(const emscripten::val& value,
+                            const char* global_type) {
+  return IsNotNullAndInstanceOf(value, emscripten::val::global(global_type));
+}
+}  // namespace cru::platform::web