New option to reduce false positives for index.ts

[tanquar]

Hi, I am working with Deno Fresh project, where "index.js" "index.ts" are typically present in import paths:

import { t } from "/utils/i18n/index.ts";

In this case, current ts-unused-exports will produce false positives, when the exporting file name is "index.ts".

2 modules with unused exports
/Users/me/my-project/utils/i18n/index.ts: Languages, t

To remove false positives in Deno projects, I suggest to add a new option.
This will prevent removing "index.ts" from the file name during parsing.

argsParser.js:

...
        switch (optionName) {
            case '--allowUnusedEnums':
                newOptions.allowUnusedEnums = true;
                break;
...
            case '--keepIndex':
                newOptions.keepIndexInFileNames = true;
                break;
...

parser/index.js:

...
var pathWithoutExtension = function (pathIn, extraOptions) {
    var parsed = path.parse(pathIn);
    if (!extraOptions.keepIndexInFileNames) {
      if (util_1.indexCandidates.some(function (i) { return pathIn.endsWith(i); }))
          return parsed.dir;
    }
    return path.join(parsed.dir, cleanFilename(pathIn));
};
...
    return {
        path: pathWithoutExtension(path, extraOptions),
        fullPath: path,
        imports: imports,
        exports: exportNames,
        exportLocations: exportLocations,
    };

I'm not sure if this change is the best way, but at least in my Deno project just commentting out

      if (util_1.indexCandidates.some(function (i) { return pathIn.endsWith(i); }))
          return parsed.dir;

part works fine.