Fixed remaining JS compilation issues

* Changed transform() to not use first class iterators
 * provide a archaic `$` for uints that will break if
   poked
 * TODO: test JS output!

private/presenter.nim

@@ -601,7 +601,7 @@ proc transform*(input: Stream, output: Stream,
     events = parser.parse(input)
   try:
     if options.style == psCanonical:
-      var specificTagEvents = iterator(): YamlStreamEvent =
+      var bys: YamlStream = newBufferYamlStream()
       for e in events:
         var event = e
         case event.kind
@@ -624,9 +624,8 @@ proc transform*(input: Stream, output: Stream,
             of yTypeUnknown: event.scalarTag = yTagString
           elif event.scalarTag == yTagExclamationMark:
             event.scalarTag = yTagString
-          yield event
-      var s = initYamlStream(specificTagEvents)
-      present(s, output, tagLib, options)
+        BufferYamlStream(bys).buf.add(e)
+      present(bys, output, tagLib, options)
     else: present(events, output, tagLib, options)
   except YamlStreamError:
     var e = getCurrentException()

private/serialization.nim

@@ -121,6 +121,11 @@ proc constructObject*(s: var YamlStream, c: ConstructionContext,
   constructObject(s, c, u32Result)
   result= uint(u32Result)
 
+when defined(JS):
+  # TODO: this is a dirty hack and may lead to overflows!
+  proc `$`(x: uint8|uint16|uint32|uint64|uint): string =
+    result = $BiggestInt(x)
+
 proc representObject*[T: uint8|uint16|uint32|uint64](value: T, ts: TagStyle,
     c: SerializationContext, tag: TagId) {.raises: [].} =
   ## represents an unsigned integer value as YAML scalar

private/streams.nim

@@ -85,7 +85,6 @@ proc finished*(s: YamlStream): bool =
       raise e
     except Exception:
       let cur = getCurrentException()
-      echo cur.getStackTrace()
       var e = newException(YamlStreamError, cur.msg)
       e.parent = cur
       raise e

yaml.nim

@@ -750,9 +750,9 @@ setTagUri(float64, "!nim:system:float64", yTagNimFloat64)
 include private.tagLibrary
 include private.events
 include private.json
+include private.streams
 include private.presenter
 include private.parse
 include private.hints
-include private.streams
 include private.serialization
 include private.dom