Upgrade to Scala.js 1.16.0.

Code changes are forward ports of the following refactorings:

* Remove the parameters to StoreModule IR nodes.
  scala-js/scala-js@659d518
* Refactor: Make FieldName a composite of ClassName and SimpleFieldName.
  scala-js/scala-js@723663b

Author: sjrd

Diff for: compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala

@@ -927,7 +927,7 @@ class JSCodeGen()(using genCtx: Context) {
           val className = encodeClassName(classSym)
           val body = js.Block(
               js.LoadModule(className),
-              js.SelectStatic(className, fieldIdent)(irTpe))
+              js.SelectStatic(fieldIdent)(irTpe))
           staticGetterDefs += js.MethodDef(
               js.MemberFlags.empty.withNamespace(js.MemberNamespace.PublicStatic),
               encodeStaticMemberSym(f), originalName, Nil, irTpe,
@@ -2243,10 +2243,7 @@ class JSCodeGen()(using genCtx: Context) {
       if (isStaticModule(currentClassSym) && !isModuleInitialized.get.value &&
           currentMethodSym.get.isClassConstructor) {
         isModuleInitialized.get.value = true
-        val className = encodeClassName(currentClassSym)
-        val thisType = jstpe.ClassType(className)
-        val initModule = js.StoreModule(className, js.This()(thisType))
-        js.Block(superCall, initModule)
+        js.Block(superCall, js.StoreModule())
       } else {
         superCall
       }
@@ -4463,13 +4460,12 @@ class JSCodeGen()(using genCtx: Context) {
             js.JSSelect(qual, genPrivateFieldsSymbol()),
             encodeFieldSymAsStringLiteral(sym))
       } else {
-        js.JSPrivateSelect(qual, encodeClassName(sym.owner),
-            encodeFieldSym(sym))
+        js.JSPrivateSelect(qual, encodeFieldSym(sym))
       }
 
       (f, true)
     } else if (sym.hasAnnotation(jsdefn.JSExportTopLevelAnnot)) {
-      val f = js.SelectStatic(encodeClassName(sym.owner), encodeFieldSym(sym))(jstpe.AnyType)
+      val f = js.SelectStatic(encodeFieldSym(sym))(jstpe.AnyType)
       (f, true)
     } else if (sym.hasAnnotation(jsdefn.JSExportStaticAnnot)) {
       val jsName = sym.getAnnotation(jsdefn.JSExportStaticAnnot).get.argumentConstantString(0).getOrElse {
@@ -4495,9 +4491,9 @@ class JSCodeGen()(using genCtx: Context) {
 
       val f =
         if sym.is(JavaStatic) then
-          js.SelectStatic(className, fieldIdent)(irType)
+          js.SelectStatic(fieldIdent)(irType)
         else
-          js.Select(qual, className, fieldIdent)(irType)
+          js.Select(qual, fieldIdent)(irType)
 
       (f, boxed)
     }

Diff for: compiler/src/dotty/tools/backend/sjs/JSEncoding.scala

@@ -17,7 +17,7 @@ import dotty.tools.dotc.transform.sjs.JSSymUtils.*
 
 import org.scalajs.ir
 import org.scalajs.ir.{Trees => js, Types => jstpe}
-import org.scalajs.ir.Names.{LocalName, LabelName, FieldName, SimpleMethodName, MethodName, ClassName}
+import org.scalajs.ir.Names.{LocalName, LabelName, SimpleFieldName, FieldName, SimpleMethodName, MethodName, ClassName}
 import org.scalajs.ir.OriginalName
 import org.scalajs.ir.OriginalName.NoOriginalName
 import org.scalajs.ir.UTF8String
@@ -173,7 +173,7 @@ object JSEncoding {
   }
 
   def encodeFieldSym(sym: Symbol)(implicit ctx: Context, pos: ir.Position): js.FieldIdent =
-    js.FieldIdent(FieldName(encodeFieldSymAsString(sym)))
+    js.FieldIdent(FieldName(encodeClassName(sym.owner), SimpleFieldName(encodeFieldSymAsString(sym))))
 
   def encodeFieldSymAsStringLiteral(sym: Symbol)(implicit ctx: Context, pos: ir.Position): js.StringLiteral =
     js.StringLiteral(encodeFieldSymAsString(sym))

Diff for: project/Build.scala

@@ -1508,7 +1508,8 @@ object Build {
             "isNoModule" -> (moduleKind == ModuleKind.NoModule),
             "isESModule" -> (moduleKind == ModuleKind.ESModule),
             "isCommonJSModule" -> (moduleKind == ModuleKind.CommonJSModule),
-            "isFullOpt" -> (stage == FullOptStage),
+            "usesClosureCompiler" -> linkerConfig.closureCompiler,
+            "hasMinifiedNames" -> (linkerConfig.closureCompiler || linkerConfig.minify),
             "compliantAsInstanceOfs" -> (sems.asInstanceOfs == CheckedBehavior.Compliant),
             "compliantArrayIndexOutOfBounds" -> (sems.arrayIndexOutOfBounds == CheckedBehavior.Compliant),
             "compliantArrayStores" -> (sems.arrayStores == CheckedBehavior.Compliant),

Diff for: project/plugins.sbt

@@ -6,7 +6,7 @@
 libraryDependencySchemes +=
   "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.15.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
 
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.21")