MODULES: lib1, lib2, main

STEP 0:
    libs: lib1, lib2, main
    dirty js: lib1, lib2, main
STEP 1:
    libs: lib1, lib2, main
    dirty js: lib1, lib2
STEP 2:
    libs: lib1, lib2, main
    dirty js: lib1, lib2, main
STEP 3:
    libs: lib1, lib2, main
    dirty js: lib1, lib2
STEP 4:
    libs: lib1, lib2, main
    dirty js: lib2, main
STEP 5..6:
    libs: lib1, lib2, main
    dirty js: lib1, lib2, main
STEP 7:
    libs: lib1, lib2, main
    dirty js: lib2
STEP 8:
    libs: lib1, lib2, main
    dirty js: lib1, lib2