Writing javascript applications with Kotlin

Question

I recently started to have a look at Kotlin and managed to create my first JVM applications. It\'s so cool to have a single language that compiles both to Java and JS. So, now I

Answer 1

Using the pom below:

<?xml version="1.0" encoding="UTF-8"?>
<project
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
        xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example.kotlin</groupId>
    <artifactId>kotlin-js</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>    
    <properties>
        <kotlin.version>1.3.61</kotlin.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <kotlin.compiler.languageVersion>1.3</kotlin.compiler.languageVersion>
        <kotlin.compiler.apiVersion>1.3</kotlin.compiler.apiVersion>

    </properties>

    <dependencies>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-js</artifactId>
            <version>${kotlin.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>kotlin-maven-plugin</artifactId>
                <groupId>org.jetbrains.kotlin</groupId>
                <version>${kotlin.version}</version>
                <configuration/>
                <executions>
                    <execution>
                            <id>compile</id>
                            <phase>compile</phase>
                            <goals>
                                <goal>js</goal>
                            </goals>                        
                            <configuration>
                                <sourceDirs>
                                  <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
                                </sourceDirs>
                                <moduleKind>umd</moduleKind>
                            </configuration>
                    </execution>
                </executions>
            </plugin>                                    
        </plugins>        
    </build>
</project>

Inside src/main/kotlin you can add Hello.kt containing a fun main(args : Array<String>){println("hello")}

then the following would print hello

mvn clean package
cd target
npm i kotlin
node js/kotlin-js.js

or you can add a non-main method and then use require() from other js code or add it to the browser using <script> (together with kotlin runtime).

Answer 2

Meanwhile Kotlin/JS is available in version 1.2 and there is an introduction, tutorial and reference on the official website.

Answer 3

if you're interested to learn about using Kotlin in Node.js app, I've put together a starter project that running a node.js server written in Kotlin. https://github.com/techprd/kotlin_node_js_seed

The aim of this project is to write a full stack web application written entirely with Kotlin JS

let me know what you guys think about this...