Current the tranform api using filename to get SourceType, but has other case at rollup/esbuild, eg. the js extension maybe using jsx sourceType for react project.

Here can't using a fake filename, because has some reasons.

1. The sourcemap using filename as sources fields, using the fake name is incorrect.
2. The jsx: 'development' need to using filename to display debugger info, using the fake name is incorrect.