Kudos for awesome module. Your overall code is neat and clean.
Still there are few issue found by pareview.sh script.
FILE: ...tes/all/modules/contrib/it_cookie_compliance/js/it_cookie_compliance.js
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FOUND 5 ERRORS AFFECTING 3 LINES
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1 | ERROR | [x] Missing file doc comment
1 | ERROR | [x] Additional whitespace found at start of file
11 | ERROR | [x] Expected 1 newline at end of file; 4 found
14 | ERROR | [ ] More than 2 empty lines are not allowed
14 | ERROR | [x] Additional whitespace found at end of file
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PHPCBF CAN FIX THE 4 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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For writing javascript as per D7 standard to maintain compatibility you can follow this guide:
https://www.drupal.org/node/171213