Add Kotlin Web (Ktor & KotlinJS) examples (2000USD Bounty)

[lihaoyi]

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From the maintainer Li Haoyi: I'm putting a 2000USD bounty on this issue, payable by bank transfer on a merged PR implementing this.

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The goal of this ticket is to implement support for example/kotlinlib/web example tests for using Kotlin for web development, mirroring the example/javalib/web and example/scalalib/web, and support for KotlinJS in the spirit of scalajslib/. I would want the following example tests, broken down into smaller groups each with its own bounty:

650USD:

• [x] example/kotlinlib/web/1-hello-ktor
  • A hello-world example using Kotlin and KTor to set up a web server serving a single "<h1>Hello, World!</h1>" web page, in the spirit of example/javalib/web/2-hello-spring-boot
• [ ] example/kotlinlib/web/2-todo-ktor
  • An implementation of the common TodoMVC demo application, including HTML templating, JS/CSS resources, database access and unit/integration/runBackground+curl tests, in the spirit of example/javalib/web/3-todo-spring-boot

650USD:

• [ ] example/kotlinlib/web/3-kotlinjs-module
  • How to define a simple KotlinJS module that can be compiled to Javascript, testing, and run using node, in the spirit of example/scalalib/web/3-scalajs-module
• [ ] example/kotlinlib/web/4-webapp-kotlinjs
  • How to wire up a KotlinJS module with a Kotlin/Ktor server to serve the generated Javascript, in the spirit of example/scalalib/web/4-webapp-scalajs

700USD:

• [ ] example/kotlinlib/web/5-webapp-kotlinjs-shared
  • How to implement code sharing between a JVM KTor server and a KotlinJS javascript module, such that common code and utilities can be used by both. In the spirit of example/scalalib/web/5-webapp-scalajs-shared,
• [ ] example/kotlinlib/web/6-cross-platform-publishing
  • How to define a library with both Kotlin-JVM and Kotlin-JS versions and publishing it to maven central. In the spirit of example/scalalib/web/6-cross-version-platform-publishing.

Each of these examples above has a corresponding javalib/scalalib equivalent, and it should generally follow the style of those equivalents (scope, testing, etc.) but translated to Kotlin (Java/Scala -> Kotlin, Scalajs -> Kotlinjs, Cask/SpringBoot -> KTor, etc.)

For now the Kotlin-JS logic should live in kotlinlib/ together with the rest of the kotlin-specific configuration.

[c0d33ngr]

Let me try if I can do anyone

[c0d33ngr]

Hello, I'm new here. How do I run the tests in the examples directory? mill testin where build.mill file is located output

build.sc file not found. Are you in a Mill project folder?

[lihaoyi]

@c0d33ngr please see the readme.md at the root of the repo