When trying to build this I'm getting:

Check file:///home/mwoodpatrick/projects/git/deno/deno-blog/bin/server.ts
error: TS2345 [ERROR]: Argument of type 'string | URL' is not assignable to parameter of type 'string'.
Type 'URL' is not assignable to type 'string'.
return new URL(url).pathname
~~~
at https://deno.land/[email protected]/path/win32.ts:911:18

TS2345 [ERROR]: Argument of type 'string | URL' is not assignable to parameter of type 'string'.
Type 'URL' is not assignable to type 'string'.
return new URL(url).pathname;
~~~
at https://deno.land/[email protected]/path/posix.ts:433:18

Found 2 errors.

I'm not sure how to debug this