Drupal Coding Standards Issues | phpcs

Problem/Motivation

Getting following error/warnings

FILE: /app/modules/contrib/paragraph_view_mode/paragraph_view_mode.module
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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67 | WARNING | Only string literals should be passed to t() where possible
----------------------------------------------------------------------------

FILE: /app/modules/contrib/paragraph_view_mode/src/Plugin/Field/FieldWidget/ParagraphViewModeWidget.php
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FOUND 1 ERROR AFFECTING 1 LINE
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144 | ERROR | [x] Use null coalesce operator instead of ternary operator.
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /app/modules/contrib/paragraph_view_mode/src/StorageManager.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
-----------------------------------------------------------------------------
197 | WARNING | Only string literals should be passed to t() where possible
-----------------------------------------------------------------------------

FILE: /app/modules/contrib/paragraph_view_mode/src/StorageManagerInterface.php
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FOUND 2 ERRORS AFFECTING 2 LINES
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28 | ERROR | [x] PHP keywords must be lowercase; expected "self" but found "SELF"
33 | ERROR | [x] PHP keywords must be lowercase; expected "self" but found "SELF"
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
-----------------------------------------------------------------------------------

Time: 1.97 secs; Memory: 12MB

Steps to reproduce

Run following command

phpcs --standard="Drupal,DrupalPractice" --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml modules/contrib/paragraph_view_mode/

Proposed resolution

Above error/warnings need to be fixed