The best practice and common questions of the Mill SCALALIB framework

The best practice and common questions of the Mill SCALALIB framework Mill SCALALIB is an efficient construction tool for building the SCALA project.This article will introduce some answers to the best practice and common questions about the Mill SCALALIB framework to help you better use and understand the framework.If you need it, some Java code examples will be provided below. Best Practices: 1. Use Task macro: The core concept of Mill Scalalib is Task macro.With TASK macro, you can simplify and optimize your building logic.Packing the commonly used construction tasks to TASK macro can avoid repeated work and improve the efficiency of construction. The following is an example. How to define a TASK macro called "Compile": scala import mill._ object myBuild extends Build { def compile: Task[Seq[String]] = T { // Compile logic // Return to compile results } } 2. Target macro: Target macro is a special type of TASK macro, which is used to represent the construction product.Using Target macro, you can specify the path of the construction product and automatically manage these products during the construction process. The following is an example. How to define a target macro called "jar": scala import mill._ object myBuild extends Build { def jar: Target[PathRef] = T { // Build the logic of jar package // Back to the path of the product } } 3. Use the SCALA version plug -in: Mill SCALALIB provides the SCALA version plug -in, which can simplify and optimize the version management of your Scala project.Using the Scala version plug -in, you can easily specify and switch the SCALA version of the project. In the project's `build.sc` file, add the following code to enable the scala version plug -in: scala import mill.scalalib._ object myBuild extends ScalaModule { // Add the scala version plug -in object scalafmt extends ScalaFmtModule {} } Frequently Asked Questions: 1. How to add dependencies to Mill Scalalib? You can use the `IvyDeps` method to add dependencies to the` build.sc` file.For example: scala import mill._, scalalib._ object myBuild extends ScalaModule { // Add dependencies def ivyDeps = T { ivy"org.apache.spark::spark-core:2.4.7"() } } 2. How to run Mill SCALALIB to build tasks? In the command line, using the following commands can run the specified construction task: shell mill myBuild.compile 3. How to specify a custom output directory? You can use the `root` method to specify the custom output directory in the` build.sc` file.For example: scala import mill._, scalalib._ object myBuild extends ScalaModule { // Specify the custom output directory def output: Path = T.dest / "my-output" } By following the above -mentioned best practice and understanding of common questions, you can better use and understand the Mill Scalalib framework.Hope this article will help you!