Kotlin/JS NodeJs Process Class

build.gradle.kts

plugins {
    kotlin("js") version "1.5.0"
    kotlin("plugin.serialization") version "1.5.0"
}

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.1")
//  ...
}

// Remaining entries omitted in favor of readability

Process.kt

import kotlinx.serialization.json.Json
import kotlinx.serialization.json.JsonObject

// The variables and functions I use most according to: https://nodejs.org/api/process.html#process_process_env

@JsName("process")
external object Process {
    val argv: Array<String>
    val env: dynamic
    val arch: String
    val execArgv: Array<String>
    val execPath: String
    val exitCode: Int
    var title: String
    val versions: dynamic

    fun cwd(): String
    fun exit(code: Int = definedExternally)
    fun getegid(): Int
    fun geteuid(): Int
    fun getgid(): Int
    fun getgroups(): Array<Int>
    fun getuid(): Array<Int>
    fun uptime(): Number

    fun on(event: String, block: (dynamic) -> Unit)
}

fun Process.args(): Array<String> = argv.slice(2 until argv.size).toTypedArray()
fun Process.env(): JsonObject = asJsonObject(env)
fun Process.versions(): JsonObject = asJsonObject(versions)

// Maybe there is a better way, but it works
private fun asJsonObject(o: Any?): JsonObject {
    val jsonString = JSON.stringify(o)
    val jsonElement = Json.parseToJsonElement(jsonString)
    return jsonElement as JsonObject
}

object ProcessEvents {
    fun onBeforeExit(block: (code: Int) -> Unit) {
        Process.on("beforeExit", block)
    }

    fun onExit(block: (code: Int) -> Unit) {
        Process.on("exit", block)
    }
}

I am grateful for everyone who contributes to this!