Fix scala.js deprecation warnings

RELEASE_NOTES.md

@@ -1,3 +1,7 @@
+# 0.11 (TBA)
+* Packaging / infrastructure improvements:
+  * [npm package](https://www.npmjs.com/package/kaitai-struct-compiler/) now returns the compiler object itself instead of constructor function ([#222](https://github.com/kaitai-io/kaitai_struct_compiler/pull/222))
+
 # 0.9 (2020-10-16)
 
 * New targets support:

build.sbt

@@ -212,7 +212,7 @@ lazy val buildNpmJsFileTask = Def.task {
        |
        |$compiledFileContents
        |
-       |return exports.io.kaitai.struct.MainJs;
+       |return exports.MainJs;
        |
        |}));
      """.stripMargin

js/README.md

@@ -53,23 +53,24 @@ Our [examples repository](https://github.com/kaitai-io/kaitai_struct_examples) c
 
 ## Plugging in
 
+> :information_source: Before the version 0.11.0 the `kaitai-struct-compiler` module returned a _compiler constructor_ (called `KaitaiStructCompiler`) and you used it as `new KaitaiStructCompiler()`, but since 0.11.0 release this is the _compiler object_ itself and using `new` is not required anymore
+
 We publish the compiler as an [UMD module](https://github.com/umdjs/umd), so it works from various environments, including server-side (eg. node) and client-side (eg. web browser) ones.
 
 Note: currently we don't publish the compiler as standard ES module. This will probably change in the future. If you need ES module please comment on [this issue](https://github.com/kaitai-io/kaitai_struct/issues/180).
 
 ### node
 
 ```javascript
-var KaitaiStructCompiler = require("kaitai-struct-compiler");
-var compiler = new KaitaiStructCompiler();
+var compiler = require("kaitai-struct-compiler");
 ```
 
 ### browser using script tags
 
 ```html
-<script src="node_modules/kaitai-struct-compiler/kaitai-struct-compiler.js"></script> 
+<script src="node_modules/kaitai-struct-compiler/kaitai-struct-compiler.js"></script>
 <script>
-    var compiler = new KaitaiStructCompiler();
+    var compiler = KaitaiStructCompiler;
 </script>
 ```
 
@@ -78,14 +79,14 @@ var compiler = new KaitaiStructCompiler();
 ```html
 <script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.4/require.min.js"></script>
 <script>
-    requirejs.config({ 
+    requirejs.config({
         paths: {
             'kaitai-struct-compiler': 'node_modules/kaitai-struct-compiler/kaitai-struct-compiler'
         }
     });
 
-    require(['kaitai-struct-compiler'], function(KaitaiStructCompiler){
-        var compiler = new KaitaiStructCompiler();
+    require(['kaitai-struct-compiler'], function(compiler){
+        // ...
     });
 </script>
 ```

js/src/main/scala/io/kaitai/struct/JavaScriptImporter.scala

@@ -2,8 +2,10 @@ package io.kaitai.struct
 
 import scala.scalajs.js
 import scala.scalajs.js.Promise
+import scala.scalajs.js.annotation.JSGlobal
 
 @js.native
+@JSGlobal
 class JavaScriptImporter extends js.Object {
   def importYaml(name: String, mode: String): Promise[js.Object] = js.native
 }

js/src/main/scala/io/kaitai/struct/MainJs.scala

@@ -7,9 +7,9 @@ import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.Future
 import scala.scalajs.js
 import scala.scalajs.js.JSConverters._
-import scala.scalajs.js.annotation.JSExport
+import scala.scalajs.js.annotation.{JSExport, JSExportTopLevel}
 
-@JSExport
+@JSExportTopLevel("MainJs")
 object MainJs {
   KSVersion.current = Version.version