MODULES: lib1, lib2, main

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