MODULES: lib1, lib1-a, lib1-b, lib1-c, lib2, main

STEP 0:
    libs: lib1, lib2, main
    dirty js: lib1, lib2, main
STEP 1:
    libs: lib1-a, lib1-b, lib1-c, lib2, main
    dirty js: lib1-a, lib1-b, lib1-c, lib2
STEP 2..3:
    libs: lib1-a, lib1-b, lib1-c, lib2, main
    dirty js: lib1-b, lib2
STEP 4:
    libs: lib1, lib2, main
    dirty js: lib1, lib2
STEP 5:
    libs: lib1, lib2, main
    dirty js: lib1