Stylesheet Parser Plugin Missing?

[machineghost]

Per the description of this package:

The CKEditor 4 npm package comes in the standard-all preset, so it includes all official CKEditor plugins, with those from the standard package active by default.

However, when I add the following to my config (NOTE: That URL is the same stylesheet used in the official example):

config.contentsCss = [
  'https://ckeditor.com/docs/ckeditor4/4.19.0/examples/assets/stylesheetparser/stylesheetparser.css',
];
config.extraPlugins = 'stylesheetparser';

I don't see any style in the dropdown in my toolbar.

Did the Stylesheet Parser Plugin get left out somehow, and how can I get it back in (using npm)?