The code is already using @tauri-apps/api/fs.FileEntry in 7 files (filesystem, openFilesState, multiple UI components).

The existing interface of FileEntry also lacks:

• separation (types) between file and directory
  • we need to check if children is not undefined
• extension name for files
• additional metadata about the file

I propose that we create an internal type for this and make the filesystem.ts the integration point with Tauri's API.

Inspiration for filesystem types and names:

• https://github.com/DefinitelyTyped/DefinitelyTyped/blob/e858f398c44ef759a64dd49854fd3470e6b65731/types/filesystem/index.d.ts#LL112C11-L112C26

I think we won't get much with that change (we don't have extname available for a file). This code (i.e. checking for the extension) would be simplified with the creation of a custom type for FileEntry (derived from Tauri's FileEntry).

Originally posted by @cguedes in #62 (comment)