Not working on virtual filename generated by ESLint preprocessor

[JounQin]

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

  
```TypeScript
export type Value = 1 | 2 | 3 | 4 | 5
```
  

Expected Result

Work like normal ts files

Actual Result

Parsing error: "parserOptions.project" has been set for @typescript-eslint/parser.
The file does not match your project config: test/fixtures/code-block.md/2.ts.
The file must be included in at least one of the projects provided

Additional Info

related to eslint/eslint#11989 and prettier/eslint-plugin-prettier#393

Versions

package	version
@typescript-eslint/parser	4.16.1
TypeScript	4.2.3
ESLint	7.21.0
node	12.21.0

[bradzacher]

Unfortunately we cannot support this usecase.
The TypeScript APIs we use require files to exist on the disk.

The "fake" files created by pre-processors obviously are not on disk, so they cannot be included in the TypeScript program.

You'll need to configure your ESLint appropriately.