9 uses of T_BOOLEAN_NOT

ConditionHelper::getNegativeConditionPart in vendor/slevomat/coding-standard/SlevomatCodingStandard/Helpers/ConditionHelper.php
DisallowComparisonAssignmentSniff::process in vendor/squizlabs/php_codesniffer/src/Standards/Squiz/Sniffs/PHP/DisallowComparisonAssignmentSniff.php: Processes this test, when one of its tokens is encountered.
RequireNullCoalesceOperatorSniff::checkIsset in vendor/slevomat/coding-standard/SlevomatCodingStandard/Sniffs/ControlStructures/RequireNullCoalesceOperatorSniff.php
RequireShortTernaryOperatorSniff::process in vendor/slevomat/coding-standard/SlevomatCodingStandard/Sniffs/ControlStructures/RequireShortTernaryOperatorSniff.php: * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint *
SpaceAfterNotSniff::register in vendor/squizlabs/php_codesniffer/src/Standards/Generic/Sniffs/Formatting/SpaceAfterNotSniff.php: Returns an array of tokens this test wants to listen for.
SpaceUnaryOperatorSniff::process in vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/Formatting/SpaceUnaryOperatorSniff.php: Processes this test, when one of its tokens is encountered.
SpaceUnaryOperatorSniff::register in vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/Formatting/SpaceUnaryOperatorSniff.php: Returns an array of tokens this test wants to listen for.
UselessParenthesesSniff::checkParenthesesAroundConditionInTernaryOperator in vendor/slevomat/coding-standard/SlevomatCodingStandard/Sniffs/PHP/UselessParenthesesSniff.php
UselessParenthesesSniff::checkParenthesesAroundVariableOrFunctionCall in vendor/slevomat/coding-standard/SlevomatCodingStandard/Sniffs/PHP/UselessParenthesesSniff.php