Support `eslint native` non-JS languages for prettier

[christopher-buss]

Clear and concise description of the problem

The format/prettier rule currently only supports JavaScript and TypeScript files unless providing a custom parser.

Current Limitation

The current implementation in src/rules/prettier.ts hardcodes the Program AST event:

return {
  Program() {
    // Formatting logic here
  }
}

However, different languages use different AST root node types, e.g. JavaScript and TypeScript use Program, whereas the eslint/markdown plugin requires a root node type.

Use Cases

This limitation prevents me from formatting markdown files with prettier while also using eslint/markdown linting rules.

Suggested solution

Implement dynamic AST type detection using context.sourceCode.ast.type:

return {
  [sourceCode.ast.type || 'Program'](node) {
    // Universal formatting logic
  }
}

Alternative

No response

Additional context

eslint-plugin-prettier added support for non-js languages here. This could be used as a basis.

Validations

• [x] Follow our Code of Conduct
• [x] Read the Contributing Guide.
• [x] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[antfu]

I didn't know that! Do you like to start a quick PR for it? Thanks!