nodejs - Error with enum generation

the issue is on node.js, an enum is generated like this:
ttypes.TPolicy = {
'1' : 'NO_SYNC',
'NO_SYNC' : 1,
'2' : 'SYNC',
'SYNC' : 2,
'3' : 'WRITE_NO_SYNC',
'WRITE_NO_SYNC' : 3
};

correct is:
ttypes.TPolicy = {
'NO_SYNC' : 1,
'SYNC' : 2,
'WRITE_NO_SYNC' : 3
};

from the .thrift file:
enum TPolicy
{
NO_SYNC = 1,
SYNC = 2,
WRITE_NO_SYNC = 3
}