diff --git a/community-build/community-projects/play-json b/community-build/community-projects/play-json
index 8a221e6465b5..1ca0fab05b44 160000
--- a/community-build/community-projects/play-json
+++ b/community-build/community-projects/play-json
@@ -1 +1 @@
-Subproject commit 8a221e6465b5139f46e63dd20957e5dcb2c73019
+Subproject commit 1ca0fab05b449580dc591da32bfce680e2e0705e
diff --git a/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala b/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala
index 745e53693c83..96608a565adc 100644
--- a/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala
+++ b/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala
@@ -1829,7 +1829,15 @@ class JSCodeGen()(using genCtx: Context) {
         }
 
       case Block(stats, expr) =>
-        js.Block(stats.map(genStat) :+ genStatOrExpr(expr, isStat))
+        // #15419 Collapse { <undefined-param>; BoxedUnit } to <undefined-param>
+        val genStatsAndExpr0 = stats.map(genStat(_)) :+ genStatOrExpr(expr, isStat)
+        val genStatsAndExpr = genStatsAndExpr0 match {
+          case (undefParam @ js.Transient(UndefinedParam)) :: js.Undefined() :: Nil =>
+            undefParam :: Nil
+          case _ =>
+            genStatsAndExpr0
+        }
+        js.Block(genStatsAndExpr)
 
       case Typed(expr, _) =>
         expr match {
diff --git a/compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala b/compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala
index a163915d8d75..0884ec19b53e 100644
--- a/compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala
+++ b/compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala
@@ -761,7 +761,7 @@ final class JSExportsGen(jsCodeGen: JSCodeGen)(using Context) {
     // Pass previous arguments to defaultGetter
     val defaultGetterArgs = previousArgsValues(defaultGetter.info.paramInfoss.head.size)
 
-    if (targetSym.isJSType) {
+    val callGetter = if (targetSym.isJSType) {
       if (defaultGetter.owner.isNonNativeJSClass) {
         if (defaultGetter.hasAnnotation(jsdefn.JSOptionalAnnot))
           js.Undefined()
@@ -784,6 +784,12 @@ final class JSExportsGen(jsCodeGen: JSCodeGen)(using Context) {
     } else {
       genApplyMethod(targetTree, defaultGetter, defaultGetterArgs)
     }
+
+    // #15419 If the getter returns void, we must "box" it by returning undefined
+    if (callGetter.tpe == jstpe.NoType)
+      js.Block(callGetter, js.Undefined())
+    else
+      callGetter
   }
 
   private def targetSymForDefaultGetter(sym: Symbol): Symbol =
diff --git a/project/Build.scala b/project/Build.scala
index fb5dabf25080..453b34901807 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -1220,6 +1220,7 @@ object Build {
           ++ (dir / "js/src/test/require-2.12" ** "*.scala").get
           ++ (dir / "js/src/test/require-sam" ** "*.scala").get
           ++ (dir / "js/src/test/scala-new-collections" ** "*.scala").get
+          ++ (dir / "js/src/test/require-no-modules" ** "*.scala").get
         )
       },
     )
diff --git a/project/plugins.sbt b/project/plugins.sbt
index bb43d75d44da..b6bc5f1184b6 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -2,7 +2,7 @@
 //
 // e.g. addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.1.0")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.9.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.10.1")
 
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.10")