Allow passing options to SCSS/Less render functions

[p7g]

This PR allows the user to pass options to the render function called for less or scss files.

My use-case for this is passing the paths option to the less configuration like this:

{
  "compilerOptions": {
    "plugins": [
      {
        "name": "typescript-plugin-css-modules",
        "options": {
          "renderOptions": {
            "less": {
              "paths": ["src/"]
            }
          }
        }
      }
    ]
  }
}

This allows me to use path aliases in my webpack config and match those in the less configuration to fix the import errors that occur because of said aliases.

In addition to that, I added some improvements to the error handling for when less fails to render the file. Previously, there would be an error like Cannot read property 'css' of undefined since the output is not passed into the callback if there was an error (I have made a PR to reflect this in the typings: DefinitelyTyped/DefinitelyTyped#39261).

[mrmckeb]

Hi @p7g, thanks for this PR - I was doing the same work yesterday, so there will be a few conflicts, but I'll work those out.

I'll try to merge this in and get this out today.

[mrmckeb]

Restarting the CI.

[mrmckeb]

Hi @p7g, we've just released v2.0.0 which includes this PR and other changes.

Release notes and migration steps can be found here: https://github.com/mrmckeb/typescript-plugin-css-modules/releases/tag/v2.0.0

Please let me know if you have any other issues or feedback! And thanks for your patience.

[p7g]

That’s awesome, thanks for all the hard work!

[mrmckeb]

No problem, very sorry about the long delays.

PS, I named it rendererOptions - but otherwise it's the same ;) Thanks for your help! You literally finished work I'd half completed the day before, so it was very helpful.