MODULES: lib1, lib2, main

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