data is required.

Author: yilinwei

dom/src/main/scala/org/scalajs/dom/BlobEvent.scala

@@ -8,13 +8,9 @@ import scala.scalajs.js.annotation._
 @js.native
 class BlobEvent(typeArg: String, init: js.UndefOr[BlobEventInit]) extends Event(typeArg, init) {
 
-  def this(typeArg: String) = {
-    this(typeArg, js.undefined)
+  def this(init: BlobEventInit) = {
+    this("dataavailable", init)
   }
 
-  def this() = {
-    this("dataavailable", js.undefined)
-  }
-
-  val data: Blob = js.native
+  def data: Blob = js.native
 }

dom/src/main/scala/org/scalajs/dom/BlobEventInit.scala

@@ -4,5 +4,5 @@ import scala.scalajs.js
 
 @js.native
 trait BlobEventInit extends EventInit {
-  var data: js.UndefOr[Blob]
+  var data: Blob
 }