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JavaScript
if (window.SmileUI) {
  // SmileUI has loaded
} else {
  document.addEventListener(
    "smile-ui-loaded", () => {
      // SmileUI has loaded
    }
  );
}
This method allows you to detect when the SmileUI object has been loaded and is available for use on the page. A corresponding smile-ui-loaded DOM event is also fired when initialization has completed. Combining these two approaches is useful for wrapping any code that makes use of the SmileUI object.

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Returns

This method returns an instance of the SmileUI object, or null if the SmileUI object has not yet finished loading.
An object as a return value does NOT mean that Smile UI has been initialized. To check for initialization after load, use the SmileUI.ready() method instead.