Added js console object

lib/js/jsconsole.nim

@@ -0,0 +1,32 @@
+#
+#
+#            Nim's Runtime Library
+#        (c) Copyright 2012 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Wrapper for the `console` object for the `JavaScript backend
+## <backends.html#the-javascript-target>`_.
+
+when not defined(js) and not defined(Nimdoc):
+  {.error: "This module only works on the JavaScript platform".}
+
+type Console* {.importc.} = ref object of RootObj
+
+{.push importcpp .}
+
+proc log*[A](console: Console, a: A)
+proc debug*[A](console: Console, a: A)
+proc info*[A](console: Console, a: A)
+proc error*[A](console: Console, a: A)
+
+{.pop.}
+
+proc log*(console: Console, a: string) = console.log(cstring(a))
+proc debug*(console: Console, a: string) = console.log(cstring(a))
+proc info*(console: Console, a: string) = console.log(cstring(a))
+proc error*(console: Console, a: string) = console.log(cstring(a))
+
+var console* {.importc, nodecl.}: Console

tests/js/tconsole.nim

@@ -0,0 +1,9 @@
+discard """
+  output: "Hello, console"
+"""
+
+# This file tests the JavaScript console
+
+import jsconsole
+
+console.log("Hello, console")