Cannot do type-aware lints with gts files

[wagenet]

Initially, I was prompted to set parserOptions.extraFileExtensions. I did this and then received the following error:

{
  message: {
    ruleId: null,
    fatal: true,
    severity: 2,
    message: 'Parsing error: ESLint was configured to run on `<tsconfigRootDir>/addons/luna/addon/components/util/cache-state.gts/0_/Users/pwagenet/Development/AuditBoard/auditboard-frontend/addons/luna/addon/components/util/cache-state.gts/0_/Users/pwagenet/Development/AuditBoard/auditboard-frontend/addons/luna/addon/components/util/cache-state.gts/0_/Users/pwagenet/Development/AuditBoard/auditboard-frontend/addons/luna/addon/components/util/cache-state.gts` using `parserOptions.project`: <tsconfigRootDir>/../../../../../users/pwagenet/development/auditboard/auditboard-frontend/tsconfig.json\n' +
      'However, that TSConfig does not include this file. Either:\n' +
      "- Change ESLint's list of included files to not include this file\n" +
      '- Change that TSConfig to include this file\n' +
      '- Create a new TSConfig that includes this file and include it in your parserOptions.project\n' +
      'See the typescript-eslint docs for more info: https://typescript-eslint.io/linting/troubleshooting#i-get-errors-telling-me-eslint-was-configured-to-run--however-that-tsconfig-does-not--none-of-those-tsconfigs-include-this-file',
    line: undefined,
    column: undefined
  }
}

Unfortunately, it's not possible to add unrecognized file extensions to the tsconfig.

(Note I had to edit the source to log the error due to the missing line. See also #1667.)

[patricklx]

Eslint mdx is compatible with typescript eslint, it has a custom parser. I think it then passes the result on to the eslint-typescript parser:
mdx-js/eslint-mdx#209
https://github.com/mdx-js/eslint-mdx/blob/master/packages/eslint-mdx/src/parser.ts

[patricklx]

actually. it looks like it works for me... without any changes to eslintrc or command parameters.
how are you runnning it?

eslint addon/
\addon\components\tabs\index.gts
  21:13  error  Expected a semicolon                    @typescript-eslint/member-delimiter-style
  22:26  error  Expected a semicolon                    @typescript-eslint/member-delimiter-style
  24:16  error  Expected a semicolon                    @typescript-eslint/member-delimiter-style
  25:4   error  Expected a semicolon                    @typescript-eslint/member-delimiter-style

[bmish]

Note that this change was reverted:

• Use custom parser for gts/gjs #1920
• Revert "Use custom parser for gts/gjs (#1920)" #1941