Pub Tidy

Package Layout is following https://dart.dev/tools/pub/package-layout

lib/
    src/
        a/
        b/
    a.dart # generated with `export` files under `src/a/` 
    b.dart # generated with `export` files under `src/b/`

• only generate entry file for the first level under lib/src/, all sub paths will be included.
• path starts with _ as private will be excluded.

Or flutter layout

lib/
    domain/
        a/
        a.dart # generated with `export` files under `domain/a/` 
    view/
        a/
        a.dart # generated with `export` files under `view/a/` 
    main.dart