added a basic working JS compiler maven plugin (though it doesn't currently let you specify any library files to compile)

libraries/examples/js-example/src/main/kotlin/sample/Hello.kt

@@ -1,7 +1,9 @@
 package sample
 
 class Hello {
+    var x = 0
+
     fun doSomething(): Unit {
-        println("Hello world!")
+        x++
     }
 }

libraries/kotlin-install/pom.xml

@@ -122,6 +122,22 @@
                             <generatePom>true</generatePom>
                         </configuration>
                     </execution>
+                    <execution>
+                        <id>org.jetbrains.kotlin:dartc</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>install-file</goal>
+                        </goals>
+                        <configuration>
+                            <groupId>org.jetbrains.kotlin</groupId>
+                            <artifactId>dartc</artifactId>
+                            <version>${project.version}</version>
+                            <packaging>jar</packaging>
+                            <file>${kotlin-sdk}/lib/js/dartc.jar</file>
+                            <createChecksum>true</createChecksum>
+                            <generatePom>true</generatePom>
+                        </configuration>
+                    </execution>
                 </executions>
             </plugin>
         </plugins>

libraries/kotlin-maven-plugin/pom.xml

@@ -107,6 +107,14 @@
             <version>2.9</version>
         </dependency>
 -->
+
+
+        <!-- for JS generation -->
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>dartc</artifactId>
+            <version>${project.version}</version>
+        </dependency>
     </dependencies>
     <build>
         <sourceDirectory>src/main/java</sourceDirectory>

libraries/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/K2JSCompilerMojo.java

@@ -10,6 +10,12 @@ import org.jetbrains.jet.cli.CompilerArguments;
  */
 public class K2JSCompilerMojo extends KotlinBaseMojo {
 
+    /**
+     * The output JS file name
+     *
+     * @required
+     * @parameter default-value="${project.build.directory}/js/${project.artifactId}.js"
+     */
     private String outFile;
 
     @Override

libraries/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/K2JSCompilerPlugin.java

@@ -13,6 +13,7 @@ import org.jetbrains.k2js.facade.K2JSTranslator;
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 
 import static kotlin.io.namespace.use;
@@ -22,10 +23,6 @@ import static kotlin.io.namespace.use;
  */
 public class K2JSCompilerPlugin implements CompilerPlugin {
 
-    /**
-     * @required
-     * @parameter default-value="${project.build.directory}/target/js/${project.artifactId}.js"
-     */
     private String outFile = "target/js/program.js";
 
     public void processFiles(CompilerPluginContext context) {
@@ -38,8 +35,7 @@ public class K2JSCompilerPlugin implements CompilerPlugin {
                     @NotNull
                     @Override
                     public List<JetFile> getLibFiles() {
-                        // TODO
-                        return null;
+                        return new ArrayList<JetFile>();
                     }
                 };
                 K2JSTranslator translator = new K2JSTranslator(config);

libraries/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinBaseMojo.java

@@ -21,6 +21,14 @@ public abstract class KotlinBaseMojo extends AbstractMojo {
      */
     private String src;
 
+    /**
+     * The output directory for bytecode classes
+     *
+     * @required
+     * @parameter default-value="${project.build.directory}/classes"
+     */
+    private String outputDir;
+
     @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
         arguments = createCompilerArguments();
@@ -28,6 +36,9 @@ public abstract class KotlinBaseMojo extends AbstractMojo {
         if (src != null) {
             arguments.setSrc(src);
         }
+        if (outputDir != null) {
+            arguments.setOutputDir(outputDir);
+        }
         configureCompilerArguments(arguments);
 
         compiler.exec(System.err, arguments);