Setup a Scala project

api/.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4

api/.gitignore

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+### SBT template
+# Simple Build Tool
+# http://www.scala-sbt.org/release/docs/Getting-Started/Directories.html#configuring-version-control
+
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+.history
+.cache
+.lib/
+
+### Scala template
+*.class
+*.log
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.bsp/
+.idea/

api/.scalafmt.conf

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+version = 3.8.2
+runner.dialect = scala3
+
+maxColumn = 100
+align.preset = some
+
+newlines.beforeMultiline = unfold
+newlines.topLevelStatements = [before, after]
+newlines.topLevelStatementsMinBreaks = 2
+newlines.implicitParamListModifierForce = [before]
+continuationIndent.defnSite = 2
+continuationIndent.extendSite = 2
+optIn.breakChainOnFirstMethodDot = true
+includeCurlyBraceInSelectChains = true
+includeNoParensInSelectChains = true
+
+trailingCommas = "multiple"
+
+rewrite.rules = [
+    RedundantBraces,
+    RedundantParens,
+    ExpandImportSelectors,
+    PreferCurlyFors
+]
+
+runner.optimizer.forceConfigStyleMinArgCount = 3
+danglingParentheses.defnSite = true
+danglingParentheses.callSite = true
+danglingParentheses.exclude = [
+    "`trait`"
+]
+verticalMultiline.newlineAfterOpenParen = true
+verticalMultiline.atDefnSite = true

api/build.sbt

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+ThisBuild / version := "0.1.0-SNAPSHOT"
+
+ThisBuild / scalaVersion := "3.4.2"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "api",
+    libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.18" % "test"
+  )

api/project/build.properties

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+sbt.version = 1.10.0

api/src/main/scala/App.scala

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+@main
+def main(): Unit =
+  println("Hello world!")
+
+def add(a: Int, b: Int): Int =
+  a + b

api/src/test/scala/AppSuite.scala

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+import org.scalatest.funsuite.AnyFunSuite
+
+class AppSuite extends AnyFunSuite {
+  test("Adding 2 and 2 should produce 4") {
+    assert(add(2, 2) == 4)
+  }
+}