MODULES: lib1, main, libProxy

STEP 0:
    libs: lib1, main
    dirty js modules: lib1, main
    dirty js files:   lib1/l1, main/m, main/m.export
STEP 1..7:
    libs: lib1, main
    dirty js modules: lib1, main
    dirty js files:   lib1/l1, main/m
STEP 8..23:
    libs: lib1, libProxy, main
    dirty js modules: lib1, libProxy, main
    dirty js files:   lib1/l1, libProxy/proxy, main/m