Add ability to configure detached option for Node.js

library/process/api/process.klib.api

@@ -341,6 +341,9 @@ open class io.matthewnelson.kmp.process.internal/events_EventEmitter { // io.mat
     final fun removeAllListeners(kotlin/String): io.matthewnelson.kmp.process.internal/events_EventEmitter // io.matthewnelson.kmp.process.internal/events_EventEmitter.removeAllListeners|removeAllListeners(kotlin.String){}[0]
 }
 
+// Targets: [js]
+final fun (io.matthewnelson.kmp.process/Process.Builder).io.matthewnelson.kmp.process/detached(kotlin/Boolean): io.matthewnelson.kmp.process/Process.Builder // io.matthewnelson.kmp.process/detached|detached@io.matthewnelson.kmp.process.Process.Builder(kotlin.Boolean){}[0]
+
 // Targets: [js]
 final fun (io.matthewnelson.kmp.process/Process.Builder).io.matthewnelson.kmp.process/shell(kotlin/Boolean): io.matthewnelson.kmp.process/Process.Builder // io.matthewnelson.kmp.process/shell|shell@io.matthewnelson.kmp.process.Process.Builder(kotlin.Boolean){}[0]
 

library/process/src/jsMain/kotlin/io/matthewnelson/kmp/process/JsProcessBuilder.kt

@@ -15,6 +15,23 @@
  **/
 package io.matthewnelson.kmp.process
 
+/**
+ * Configures the `detached` option for `spawn`.
+ *
+ * **NOTE:** `unref` will be called immediately on the underlying child process.
+ * It is upon API consumers to ensure an appropriate [Stdio] configuration is had
+ * for their detached [Process], as detailed in the documentation linked below.
+ *
+ * Default: `false`
+ *
+ * [docs#spawn](https://nodejs.org/api/child_process.html#optionsdetached)
+ * */
+public fun Process.Builder.detached(
+    enable: Boolean,
+): Process.Builder = apply {
+    platform().detached = enable
+}
+
 /**
  * Configures the `shell` option for `spawn` and `spawnSync`
  *

library/process/src/jsMain/kotlin/io/matthewnelson/kmp/process/internal/NodeJsProcess.kt

@@ -24,6 +24,7 @@ import io.matthewnelson.kmp.process.*
 
 internal class NodeJsProcess internal constructor(
     private val jsProcess: child_process_ChildProcess,
+    private val isDetached: Boolean,
     command: String,
     args: List<String>,
     chdir: File?,
@@ -52,6 +53,8 @@ internal class NodeJsProcess internal constructor(
             val t = (err as? Throwable) ?: IOException("$err")
             onError(t, lazyContext = { "nodejs.on('error')" })
         }
+
+        if (isDetached) jsProcess.unref()
     }
 
     // @Throws(Throwable::class)
@@ -109,7 +112,7 @@ internal class NodeJsProcess internal constructor(
             null
         }
 
-        if (wasDestroyed) jsProcess.unref()
+        if (wasDestroyed && !isDetached) jsProcess.unref()
 
         error?.let { throw it }
     }

library/process/src/jsMain/kotlin/io/matthewnelson/kmp/process/internal/PlatformBuilder.kt

@@ -25,6 +25,7 @@ import org.khronos.webgl.Int8Array
 // jsMain
 internal actual class PlatformBuilder private actual constructor() {
 
+    internal var detached: Boolean = false
     // String or Boolean
     internal var shell: Any = false
     internal var windowsVerbatimArguments = false
@@ -150,12 +151,13 @@ internal actual class PlatformBuilder private actual constructor() {
     ): Process {
         val jsEnv = env.toJsEnv()
         val jsStdio = stdio.toJsStdio()
+        val isDetached = detached
 
         val opts = js("{}")
         chdir?.let { opts["cwd"] = it.path }
         opts["env"] = jsEnv
         opts["stdio"] = jsStdio
-        opts["detached"] = false
+        opts["detached"] = isDetached
         opts["shell"] = shell
         opts["windowsVerbatimArguments"] = windowsVerbatimArguments
         opts["windowsHide"] = windowsHide
@@ -167,6 +169,7 @@ internal actual class PlatformBuilder private actual constructor() {
 
         return NodeJsProcess(
             jsProcess,
+            isDetached,
             command,
             args,
             chdir,