haoyi li a deep dive into the mill scala build tool

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a deep dive into mill: the scala build tool

mill is a modern build tool for scala that aims to be simple, fast, and easy to use. it allows developers to define builds using scala code rather than xml or other configuration files, making it more intuitive for scala developers.

key features of mill

1. **scala-based build definitions**: mill uses scala for its build definitions, which means you can leverage the full power of the scala language.
2. **incremental compilation**: mill supports incremental compilation, meaning only the parts of your codebase that have changed will be recompiled.
3. **fast execution**: mill is designed to be fast, with a focus on minimizing overhead during builds.
4. **cross-building**: mill makes it easy to build projects for multiple scala versions.
5. **modular**: mill encourages modular project structures, promoting separation of concerns.

getting started with mill

prerequisites

**scala**: make sure you have scala installed on your machine. you can install it via [scala's official website](https://www.scala-lang.org/download/) or use a package manager.
**mill**: you can install mill by downloading it from the [mill github repository](https://github.com/lihaoyi/mill) or by using a package manager like homebrew on macos (`brew install mill`).

creating a new mill project

1. **create a new directory**:
```bash
mkdir my-mill-project
cd my-mill-project
```

2. **create the mill build file**:
create a file named `build.sc` in your project directory. this file will contain your build definitions. here's a simple example:

```scala
import mill._, scalalib._

object mymodule extends scalamodule {
def scalaversion = "2.13.6"

def scalaorganization = "org.scala-lang"

def dependencies = seq(
"com.lihaoyi" %% "upickle" % "1.4.0"
)

def sources = t.sources {
mill.modules.jvm.fetch(
"https://raw.githubusercontent.com/lih... ...

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