Very slow with typescript-eslint parser and `project`

Hi! Since we’ve added the project: './tsconfig.json' option to parserOptions (to allow @typescript-eslint/prefer-nullish-coalescing rule for instance) the parsing is really really slow. On our project it went from 30s to 11min. If we exclude .vue files or remove the project option then it’s fast again.

Anyone else went into this issue? Indeed I ran into https://github.com/typescript-eslint/typescript-eslint/issues/389 but the performance on our project when excluding .vue files is ok, so it’s really the parsing of <script> SFCs imho.

Our eslint parsing options:

parser: 'vue-eslint-parser',
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: 'module',
    parser: '@typescript-eslint/parser',
    project: './tsconfig.json',
    extraFileExtensions: ['.vue'],
  }

[yoyo930021]

Try this https://github.com/vuejs/vue-eslint-parser/issues/104#issuecomment-875149361

[yoyo930021]

The reason is in https://github.com/vuejs/vue-eslint-parser/issues/104.