Auto close bracket configuration not working

[mikepqr]

I have:

IPython.CodeCell.options_default.cm_config.autoCloseBrackets = false;

in ~/.jupyter/custom/custom.js. Here's the full file. Until recently this used to ensure that the a closing bracket was not inserted. I guess I upgraded some aspect of jupyter as some point, and it no longer works. Any ideas?

$ jupyter --version
4.3.0
$ jupyter notebook --version
5.0.0
$ python --version
Python 3.6.1

I've seen #78. jupyter_core==4.2.3 is no longer pip installable.

[axil]

It looks as if the solution from jupyter notebook issue 2650 is the way to go right now.