https://github.com/wojta/kotlin-nodejs-experiment

Demo of using Kotlin with Node.js
https://github.com/wojta/kotlin-nodejs-experiment

express kotlin nodejs

Last synced: about 1 month ago
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Demo of using Kotlin with Node.js

• Host: GitHub
• URL: https://github.com/wojta/kotlin-nodejs-experiment
• Owner: wojta
• Created: 2016-04-19T07:07:11.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-03-20T15:18:59.000Z (almost 8 years ago)
• Last Synced: 2023-08-01T09:29:27.585Z (over 1 year ago)
• Topics: express, kotlin, nodejs
• Language: JavaScript
• Size: 545 KB
• Stars: 20
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Demo of using  Kotlin with Node.js

It's a little demo using Kotlin with Node.js. It uses Gradle as a build tool.

## What is Kotlin?

[![Kotlin](https://upload.wikimedia.org/wikipedia/commons/b/b5/Kotlin-logo.png)

otlin](http://kotlinlang.org) is a programming language developed by [Jetbrains](https://www.jetbrains.com/). It's fully compatibile with [Java](http://www.java.com) runtimes and also there is (currently experimental) support for [JavaScript](https://en.wikipedia.org/wiki/JavaScript) transpilation. 

## What is it doing?

* It only has two pages - index and `/kotlin_demo`

* `/kotlin_demo` shows list of files in current directory by using calls from [Demo](demo_kotlin/src/main/kotlin/cz/sazel/demo_kotlin/Demo.kt) class

## Structure

* ``demo_kotlin`` - module with Kotlin code

* ``express_js`` - module with basic Node.js Express app

* ``express_js/compiled`` - transpiled .js files and Kotlin standard library (in ``lib``)

* ``express_js/bin`` - place for server's startup scripts

## How it works?

Transpiler does the transpilation to [JavaScript](https://en.wikipedia.org/wiki/JavaScript). Product of this process is file ``demo_kotlin.js``. Also you have base Kotlin JavaScript library ``kotlin.js`` that contains standard library and all support functions. JavaScript files are copyied by Gradle script to ``compiled`` directory in ``express_js`` module and after that you can use them from JavaScript.

Kotlin Gradle plugin handles building Node.js compatibile modules (CommonJS) by adding parameter

 

 `kotlinOptions.moduleKind = "commonjs"`

## Accessing Kotlin class from JavaScript

Check [express_js/route/kotlin.js](express_js/route/kotlin.js)

`var Demo=require("../compiled/demo_kotlin").cz.sazel.demo_kotlin.Demo;`

## Install and strartup

* You'll need [Node.js](https://nodejs.org/en/) (probably version >=5) installed in your system.  

* If you used previous version of this experiment, please run `:demo_kotlin:clean` Gradle task.

* Do `./gradlew build`

* Do `./gradlew :express_js:npmInstall` or `npm install` in *express_js* directory

* Start server by starting `express_js/bin/www` and go to page [http://localhost:3000/kotlin_demo](http://localhost:3000/kotlin_demo)