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Module

An Amper module is a directory with a module.yaml configuration file, and optionally sources and resources.

kotlin/amper/compose
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Introduction

Amper …

An Amper module is a directory with a module.yaml configuration file, and optionally sources and resources. A module configuration file describes what to produce: e.g. a reusable library or a platform-specific application.

Module layout

Here are typical module structures at a glance:

my-module/
├─ resources/
│  ╰─ logback.xml
├─ src/
│  ├─ main.kt
│  ╰─ Util.java
├─ test/
│  ╰─ MainTest.java
│  ╰─ UtilTest.kt
├─ testResources/
│  ╰─ logback-test.xml
╰─ module.yaml

All sources and resources are optional: only the module.yaml file is required. For example, your module could get all its code from dependencies and have no src folder.

TODO: https://amper.org/latest/user-guide/basics/#module-file-anatomy

Working environment

Open the Idea editor and install the Amper plugin.

Create a “JVM console application” project:

Module

An Amper module is a directory with a module.yaml configuration file, source files, and resources that describes a single product.

A module configuration file describes what to produce: for example, a reusable library or a specific application for desktop, Android, or other platforms.

Since you’ve created a simple JVM project, the content of the module.yaml file is minimal.

The file is in YAML format (check the activity if you don’t know what it is).

A module consists by default of the src and test folders.

The main.kt and WorldTest.kt files are normal Kotlin files with nothing special.

To run an application, use the ‘run’ icon () next to the product section of the module.yaml file:

You can also use the ‘run’ icon ( ) next to the main() function:

Source code

Source files are located in the src folder:

|-src/
|  |-main.kt
|-module.yaml

By default, the entry point for JVM applications (the main function) is expected to be in a main.kt file (case-insensitive) in the src folder.

This can be overridden by specifying an explicit main class in the module configuration:

yaml
module.yaml
product: jvm/app
settings:
  jvm:
    mainClass: dev.xtec.TotoKt
Note

In Kotlin, the main function is usually found at the top level of the file.

However, the JVM expects a main class when running any application.

Kotlin always compiles top-level declarations into a class, and the name of this class is derived from the filename by capitalizing the name and converting the .kt extension into a Kt suffix.

For example, top-level declarations from toto.kt will be in a class named TotoKt.

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