CSF = Storybook’s Component Story Format (CSF)
See https://storybook.js.org/docs/formats/component-story-format/
Note that the migrations still use CommonJS require, so the default export as
an object is quite ergonomic (& I don't want to touch the migrations).
* eslint: Check for unused function arguments
* eslint: Ignore unused '_' in argument list
Also allow any number of '_' e.g., '__' or '___' which is to be used sparingly
* Remove and rename unused arguments