So I used KaMPKit as my bootstrap so my tree looks like

src
├── androidMain
├── androidTest
├── browserMain
├── commonMain
├── commonTest
├── iosMain
├── iosTest
├── jsMain
└── main

my config so far looks like

js("browser") {
        val main by compilations.getting {
            kotlinOptions {
                outputFile = "${buildDir}/web/${project.parent?.name?.toLowerCase() ?: name}-browser.js"
                noStdlib = false
                moduleKind = "umd"
            }
        }
    }

so can I bundle here? or do people usually do a mulit project build and bundle elsewhere?

Same type of question being discussed in #javascript https://kotlinlang.slack.com/archives/C0B8L3U69/p1583228562114200