When I attempt to run can-migrate on my Windows machine, I get the following output:
> can-migrate "**/*.js" --apply --can-version 3
Running transform: undefined.
0 / 43 files modified (0 errors).
Percent complete: 1%.
Time remaining: 1018 seconds.
Running transform: undefined.
0 / 43 files modified (0 errors).
Percent complete: 2%.
Time remaining: 947 seconds.
Running transform: undefined.
0 / 43 files modified (0 errors).
Percent complete: 3%.
Time remaining: 921 seconds.
The same happens with --can-version 4. @chasenlehara indicated that this issue may be specific to Windows.