Extend Plugin API: Retrieve final result for file

[tbsmark86]

Hi,

i would like to see something like:
this.getContents('/some/file/path.js');
to return exactly the same as the webserver would.
Right now my plugin is doing a http-request on itself but that seems way to complicated.

Why? I'am writing the result to a temporary directory so that Karma can pickup the change.

Here is my plugin: https://github.com/tbsmark86/snowpack-typescript-eslint-karma

Also access to the logger instance would be nice.