I created a new TypeScirpt project, added the json file to the solution, changed the 'Copy to Output directory' property to Copy always.
When I F5 the project, the browser complains that it cannot find the resource somedata.json
If I run the python SimpleHTTPServer, load up the same html file, it works.
<script type="text/javascript">
d3.json("somedata.json", draw);
</script>
Thank you.