In a Kotlin/JS project attempting to build fails on task `browserProductionWebpack` with `java.lang....

# javascript

[Cru]

In a Kotlin/JS project attempting to build fails on task browserProductionWebpack with java.lang.NullPointerException (no error message)
This is my current config

kotlin {
    js(IR) {
        binaries.executable()
        browser {
            commonWebpackConfig {
                cssSupport {
                    enabled.set(true)
                    mode.set("extract")
                }
                devServer!!.port = 50517
            }
            testTask {
                useMocha()
            }
        }
    }
}

On a linux (kubuntu) system I have Firefox installed and no chrome/chromium. How can I solve this problem and are there any guides for setting up firefox to web testing

[Cru]

Figured it out.
devServer!!.port = 50517 is the problematic part. As there is no devServer when executing the browserProductionWebpack task

[Cru]

Changed it to devServer?.port = 50517