dependsOn can now be used inside a .sbt file for a subproject

main/src/main/scala/sbt/dsl/package.scala

@@ -4,12 +4,13 @@ import internals.{
   DslEntry,
   DslConfigs,
   DslEnablePlugins,
-  DslDisablePlugins
+  DslDisablePlugins,
+  DslDependsOn
 }
 
 package object dsl {
   def enablePlugins(ps: AutoPlugin*): DslEntry = DslEnablePlugins(ps)
   def disablePlugins(ps: AutoPlugin*): DslEntry = DslDisablePlugins(ps)
   def configs(cs: Configuration*): DslEntry = DslConfigs(cs)
-
-}
+  def dependsOn(deps: ClasspathDep[ProjectReference]*): DslEntry = DslDependsOn(deps)
+}

main/src/main/scala/sbt/internals/DslAst.scala

@@ -58,4 +58,7 @@ case class DslDisablePlugins(plugins: Seq[AutoPlugin]) extends ProjectManipulati
 case class DslConfigs(cs: Seq[Configuration]) extends ProjectManipulation {
   override val toFunction: Project => Project = _.configs(cs: _*)
 }
-
+/** Represents registering an internal dependency for the current project */
+case class DslDependsOn(cs: Seq[ClasspathDep[ProjectReference]]) extends ProjectManipulation {
+  override val toFunction: Project => Project = _.dependsOn(cs: _*)
+}

notes/0.13.12/depends-on-build-sbt.md

@@ -0,0 +1,9 @@
+  [@anatolydwnld]: https://github.com/anatolydwnld
+
+### Fixes with compatibility implications
+
+### Improvements
+
+- Add the ability to call dependsOn for the current project inside a build sbt file. By [@anatolydwnld][@anatolydwnld]
+
+### Bug fixes

sbt/src/sbt-test/project/subproject-dependson/build.sbt

@@ -0,0 +1,11 @@
+val projA = project in file("projA")
+
+val projB = project in file("projB")
+
+lazy val check = taskKey[Unit]("Verifies expected build behavior")
+
+check := {
+  val projBDeps = (dependencyClasspath in (projB, Compile)).value.map(_.data)
+  val assertion = projBDeps.filter(_.getAbsolutePath.contains("projA")).nonEmpty
+  assert(assertion, "Unable to find projA classes in projB's dependency list")
+}

sbt/src/sbt-test/project/subproject-dependson/projA/build.sbt

@@ -0,0 +1 @@
+name := "projA"

sbt/src/sbt-test/project/subproject-dependson/projB/build.sbt

@@ -0,0 +1,3 @@
+name := "projB"
+
+dependsOn(LocalProject("projA"))

sbt/src/sbt-test/project/subproject-dependson/test

@@ -0,0 +1 @@
+> check