MetacityTemplate/Packages/com.unity.metacity-sdk/Runtime/Plugins/webgl.jslib

mergeInto(LibraryManager.library, {
  SendMessageToJs: function (message) {
    if (window.dispatchReactUnityEvent) {
        var msg = UTF8ToString(message);
        try {
            window.dispatchReactUnityEvent("OnWebglMessage", msg);
        } catch (e) {
            console.warn("Failed to dispatch event OnWebglMessage " + msg);
        }
    }
  }
});