How to fix «Uncaught TypeError: jQuery(...).slick is not a function»?

Administration Third-party extensions
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Step 1.

A third-party design theme used an absent slick jQuery plugin in my case.
I have added it as a stub at the top of the problem script:

jQuery.fn.slick = jQuery.fn.slick || function() {};

Step 2.

Then, I redeployed the Magento’s static content:

rm -rf pub/static/* 

bin/magento setup:static-content:deploy