There are at least two problems currently:

1. parseOptions() calls createAutoEncrypter() in connection_string.ts#L421, which uses `client.options` in connect.ts#L118, which is an empty object at that point because the call to parseOptions() in mongo_client.ts#L302 has not returned yet.

2. The name `AutoEncrypterClass` in connect.ts#L139 should be just `AutoEncrypter`.