injectJs method
Implementation
Future<void> injectJs(
{WebViewXInjectJsVersion esVersion = WebViewXInjectJsVersion.es5}) async {
final jsVersion =
esVersion == WebViewXInjectJsVersion.es5 ? 'default' : 'async';
final jsPath = 'packages/webview_jsbridge_x/assets/$jsVersion.js';
final jsFile = await rootBundle.loadString(jsPath);
controller?.runJavascript(jsFile);
}