This is just a formatter for Kotlin (.kt) and KotlinScript (.kts)

Make sure you have ktlint installed before installing this extension

You need the ktlint jar file and either have it in your project root or specify its location in the vscode settings (ktlintPath)

You can either use the kotlin-formatter.formatKotlin command or set cstef.kotlin-formatter as your default formatter in VScode settings

Set cstef.kotlin-formatter as your formatter for kotlin and/or kotlinscript in VScode's settings.json:

    {
        ...
        "[kotlin]": {
            "editor.defaultFormatter": "cstef.kotlin-formatter"
        },
        "[kotlinscript]": {
            "editor.defaultFormatter": "cstef.kotlin-formatter"
        }
        ...
    }