I updated ( again ) to 4.2.0 but get the same error. This is the .log (sqapp is my sitename)
[debug] [2018-08-23T08:50:25.454Z] ----------------------------------------------------------------------
[debug] [2018-08-23T08:50:25.458Z] Command: /usr/local/bin/node /usr/local/bin/firebase deploy sqapp --debug
[debug] [2018-08-23T08:50:25.459Z] CLI Version: 4.2.0
[debug] [2018-08-23T08:50:25.459Z] Platform: darwin
[debug] [2018-08-23T08:50:25.459Z] Node Version: v8.9.1
[debug] [2018-08-23T08:50:25.459Z] Time: Thu Aug 23 2018 10:50:25 GMT+0200 (CEST)
[debug] [2018-08-23T08:50:25.460Z] ----------------------------------------------------------------------
[debug]
[error]
[error] Error: Too many arguments. Run firebase help deploy for usage instructions