I finally sat down and got my blog compiling with deno. Now that there is official npm support I didn't need to completely rewrite the compiler which was what was stopping me before.

In deno obtaining the path of the current script is done via the import.meta.url api:

const scriptPath = new URL(import.meta.url).pathname;

On Windows though this will return a path with unix style path seperators and a leading /:

/D:/Code/deno-path-of-script/main.ts