typescript: add package. Closes #2712

Typed superset of JavaScript that compiles to plain JavaScript.

http://www.typescriptlang.org/

pkgs/development/web/typescript/default.nix

@@ -0,0 +1,28 @@
+{ stdenv, fetchurl, nodejs }:
+
+stdenv.mkDerivation rec {
+  version = "0.9.1-1";
+  name = "typescript-${version}";
+
+  src = fetchurl {
+    url = "http://registry.npmjs.org/typescript/-/${name}.tgz";
+    sha256 = "0fgfp58hki0g1255lvv17pdk77m1bf7dbwzb0vdb91mhp2masc6q";
+  };
+
+  propagatedBuildInputs = [ nodejs ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp -r * $out
+    chmod a+x $out/bin/tsc
+  '';
+
+  meta = with stdenv.lib; {
+    description = "TypeScript is a language for application scale JavaScript development";
+    longDescription = ''
+      TypeScript is a language for application scale JavaScript development'';
+    homepage = http://nodejs.org;
+    license = licenses.asl20;
+    maintainers = [ maintainers.joamaki ];
+  };
+}