A live-coding introduction to Mill: finally a build tool we can all understand!
summary
Claims Mill is a Scala-first build tool with build definitions written as plain Scala that create queryable task graphs; the demo uses the cowsay4s repo and actually builds, cross-compiles and runs. It shows mill tasks are Scala values, targets cached by default and writing a custom code‑generation task that writes into a task‑owned directory. It exports build state as outputs queryable as JSON for IDE import, supports cross-build for Scala versions and JVM/JS, and demonstrates publishing to a Maven repo.
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chapters (20)
- 0:00Intro
- 0:38What is Mill
- 1:27Why Mill
- 4:53Define a build
- 8:19Multi module build
- 11:08CowsA
- 12:48Build Odyssey
- 13:58Launch Odyssey
- 14:28Empty Bill
- 14:51Scala Module
- 17:08Dependencies
- 17:36Code execution
- 18:56Inspection
- 21:03Test
- 22:03Arguments
- 23:38What changed
- 25:27Using wildcards
- 29:23Crosscompiling
- 34:15Defining different modules
- 40:33Cogeneration
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