How to adjust configuration like included files or project service?
Hi there,
I have updated my project to ESLint 9 and all packages required for this to the latest version. Among all these packages I `eslint-config-xo-typescript` to enable linting for TypeScript files. Two issues arise from this:
1) In my case the file extension is `.ts` but `eslint-config-xo-typescript` uses [`.tsx`](https://github.com/xojs/eslint-config-xo-typescript/blob/1f59ada8bf66c11cdda1fe4609288fd2f5c25aff/index.js#L742), therefore I have to adjust the configuration somehow and the only solution I found was mangling the configuration object like
``` es6
// eslint.config.mjs
import xoTypeScript from 'eslint-config-xo-typescript';
const tsxConfigurationObject = xoTypeScript[xoTypeScript.length - 1];
// Include .ts files in liniting, required because file extension .tsx is configured by default
tsxConfigurationObject.files.push('**/*.ts');
export default [
...xoTypeScript
];
```
2) With the update to ESLint 9 the config file needs to use the `.mjs` extension to have the config file linted correctly but this causes addtional errors thrown by the project service. To fix this the following configuration is needed:
``` es6
// eslint.config.mjs
import xoTypeScript from 'eslint-config-xo-typescript';
const tsConfigurationObject = xoTypeScript[1];
// https://github.com/typescript-eslint/typescript-eslint/issues/9739#issuecomment-2296442418
tsConfigurationObject.languageOptions.parserOptions.projectService = {
allowDefaultProject: ['eslint.config.mjs'],
...
};
export default [
...xoTypeScript
];
```
TLDR;
I need to mangle with the configuration object returned from `import`. The use of index-based access raises a warning flag on my side because this could break easily. So, is there another way to adjust the configuration or is there any plan to support adjustments?
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