Flutter has nothing to do with JavaScript . While Dart can be compiled to JavaScript, Flutter doesn’t use this feature. For Flutter Dart is compiled to native binary code.
Read moreCan Dart use JavaScript libraries?
This library provides access to JavaScript objects from Dart , allowing Dart code to get and set properties, and call methods of JavaScript objects and invoke JavaScript functions. The library takes care of converting between Dart and JavaScript objects where possible, or providing proxies if conversion isn’t possible.
Read moreHow do I use local flutter package?
For the full process:
Read moreWhat is a package in flutter?
Packages, according to Flutterdocs, can be explained as “shared packages contributed by other developers to the Flutter and Dart ecosystems . This allows developers to quickly build an app without having to develop everything from scratch.”
Read moreHow do I install a package on flutter?
How to Fix “Failed to install the following Android SDK packages as some licenses have not been accepted” Error in Android Studio?
Read moreHow do I load a package on DART?
To use a package, do the following:
Read moreHow do you write a Flutter package?
Developing Dart packages
Read more