Hi,
Welcome to the community!
At a guess, you’re not using the SonarScanner for .NET, are you? If you were, I think you’d be complaining that your C# files are analyzed but not your JS &etc.
For you, the trick to getting everything in one go is to is to start with the SonarScanner for .NET, and then make sure a project references all the other files. I’ve had success before with syntax like this in a .csproj file:
<ItemGroup>
<Content Include="src\**\*.js"/>
HTH,
Ann