build: add type ts support in core

Author: marco-ippolito

configure.py

@@ -1737,7 +1737,7 @@ def gcc_version_ge(version_checked):
   return True
 
 def configure_node_lib_files(o):
-  o['variables']['node_library_files'] = SearchFiles('lib', 'js')
+  o['variables']['node_library_files'] = SearchFiles('lib', 'js') + SearchFiles('lib', 'ts')
 
 def configure_node_cctest_sources(o):
   o['variables']['node_cctest_sources'] = [ 'src/node_snapshot_stub.cc' ] + \