WordPress/Sniffs/WP/DeprecatedClassesSniff.php
public function getGroups() {
		// Make sure all array keys are lowercase.
		$this->deprecated_classes = array_change_key_case( $this->deprecated_classes, CASE_LOWER );

		return array(
			'deprecated_classes' => array(
				'classes' => array_keys( $this->deprecated_classes ),
			),
		);
	}
public function getGroups() {
		// Make sure all array keys are lowercase.
		$this->deprecated_classes = array_change_key_case( $this->deprecated_classes, CASE_LOWER );

		return array(
			'deprecated_classes' => array(
				'classes' => array_keys( $this->deprecated_classes ),
			),
		);
	}
Groups of classes to restrict.

@return array