Upgrade to Scala.js 1.1.0.

JSCodeGen was changed according to scala-js/scala-js#4040

Author: FabioPinheiro

compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala

@@ -1532,9 +1532,9 @@ class JSCodeGen()(implicit ctx: Context) {
           case jstpe.LongType =>
             js.BinaryOp(js.BinaryOp.Long_-, js.LongLiteral(0), genArg)
           case jstpe.FloatType =>
-            js.BinaryOp(js.BinaryOp.Float_-, js.FloatLiteral(0.0f), genArg)
+            js.BinaryOp(js.BinaryOp.Float_*, js.FloatLiteral(-1.0f), genArg)
           case jstpe.DoubleType =>
-            js.BinaryOp(js.BinaryOp.Double_-, js.DoubleLiteral(0), genArg)
+            js.BinaryOp(js.BinaryOp.Double_*, js.DoubleLiteral(-1.0), genArg)
         }
 
       case NOT =>

project/plugins.sbt

@@ -2,7 +2,7 @@
 //
 // e.g. addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.1.0")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.0.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.1.0")
 
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.6")