backs.
	 *
	 * @since 4.12.12
	 *
	 * @param array $arguments Set of arguments passed to the widget at hand.
	 *
	 * @return array<string,mixed> The validated widget arguments map.
	 */
	public function validate_arguments( array $arguments );

	/**
	 * Returns the array of callbacks for this widget's arguments.
	 *
	 * @since 4.12.12
	 *
	 * @return array<string,callable> A map of the widget arguments that have survived validation.
	 */
	public function get_validated_arguments_map();

	/**
	 * Returns the array of callbacks for this widget's arguments.
	 *
	 * @since 4.12.12
	 *
	 * @param array<string,callable> $validate_arguments_map Array of callbacks for this widget's arguments.
	 *
	 * @return array<string,callable> A map of the widget arguments that have survived validation.
	 */
	public function filter_validated_arguments_map( $validate_arguments_map = [] );

	/**
	 * Returns an array of admin fields for the widget.
	 *
	 * @since 4.12.14
	 *
	 * @return array<string,mixed> The array of widget admin fields.
	 */
	public function get_admin_fields();

	/**
	 * Filter a widget's admin fields.
	 *
	 * @since 4.12.14
	 *
	 * @param array<string,mixed> $admin_fields The array of widget admin fields.
	 *
	 * @return array<string,mixed> The array of widget admin fields.
	 */
	public function filter_admin_fields( $admin_fields );

	/**
	 * Filters a widget's updated instance.
	 *
	 * @since 4.12.14
	 *
	 * @param array<string,mixed> $updated_instance The updated instance of the widget.
	 * @param array<string,mixed> $new_instance The new values for the widget instance.
	 *
	 * @return array<string,mixed> The updated instance to be saved for the widget.
	 */
	public function filter_updated_instance( $updated_instance, $new_instance );

	/**
	 * Returns a widget arguments after been parsed.
	 *
	 * @since 4.12.12
	 * @since 4.13.0 Deprecated the instance method as that is passed only to setup_arguments method.
	 *
	 * @param array<string,mixed> $_deprecated Saved values for the widget instance.
	 *
	 * @return array<string,mixed> The widget arguments, as set by the user in the widget string.
	 */
	public function get_arguments( array $_deprecated = [] );

	/**
	 * Filter a widget's arguments after they have been been parsed.
	 *
	 * @since 4.12.12
	 *
	 * @param array<string,mixed> $arguments Current set of arguments.
	 *
	 * @return array<string,mixed> The widget arguments, as set by the user in the widget string.
	 */
	public function filter_arguments( $arguments );

	/**
	 * Get a single widget argument after it has been parsed and filtered.
	 *
	 * @since 4.12.12
	 *
	 * @param string|int   $index   Which index we intend to fetch from the arguments.
	 * @param array|mixed  $default Default value if it doesn't exist.
	 *
	 * @uses  Tribe__Utils__Array::get For index fetching and Default.
	 *
	 * @return mixed Value for the Index passed as the first argument.
	 */
	public function get_argument( $index, $default = null );

	/**
	 * Filter a widget argument.
	 *
	 * @since 4.12.12
	 *
	 * @param mixed       $argument The argument value.
	 * @param string|int  $index    Which index we intend to fetch from the arguments.
	 * @param array|mixed $default  Default value if it doesn't exist.
	 *
	 * @uses  Tribe__Utils__Array::get For index fetching and Default.
	 *
	 * @return mixed Value for the Index passed as the first argument.
	 */
	public function filter_argument( $argument, $index, $default = null );

	/**
	 * Get default arguments for a widget.
	 *
	 * @since 4.12.12
	 *
	 * @return array<string,mixed> The map of widget default arguments.
	 */
	public function get_default_arguments();

	/**
	 * Filter a widget's default arguments.
	 *
	 * @since 4.12.12
	 *
	 * @param array<string,mixed> $default_arguments Current set of default arguments.
	 *
	 * @return array<string,mixed> The map of widget default arguments.
	 */
	public function filter_default_arguments( array $default_arguments = [] );


	/**
	 * Filter a widget's arguments before they are passed to the context.
	 *
	 * @since 4.13.0
	 *
	 * @param array<string,mixed>  $alterations Current set of alterations for the context.
	 * @param array<string,mixed>  $arguments   Current set of arguments in the widget.
	 *
	 * @return array<string,mixed> The map of arguments after filtering.
	 */
	public function filter_args_to_context( array $alterations = [], array $arguments = [] );

	/**
	 * Returns a widget's HTML.
	 *
	 * @since 4.12.12
	 *
	 * @return string The rendered widget's HTML code.
	 */
	public function get_html();

	/**
	 * Sets the sidebar arguments sent by the theme.
	 *
	 * @since 4.13.0
	 *
	 * @param array<string,mixed> $arguments Arguments passed by the theme.
	 */
	public function setup_sidebar_arguments( $arguments );

	/**
	 * Sets the sidebar arguments sent by the theme.
	 *
	 * @since 4.13.0
	 *
	 * @return array<string, mixed> Arguments sent by the theme and stored in this class.
	 */
	public function get_sidebar_arguments();

	/**
	 * Sets the sidebar arguments sent by the theme.
	 *
	 * @since 4.13.0
	 *
	 * @param array<string,mixed> $arguments Arguments passed by the theme.
	 *
	 * @return array<string, mixed> Arguments sent by the theme and stored in this class.
	 */
	public function filter_sidebar_arguments( $arguments );

	/**********************
	 * Deprecated Methods *
	 **********************/

	/**
	 * Returns the widget slug that allows the widget to be built via the widget class using that slug.
	 *
	 * @since 4.12.12
	 *
	 * @deprecated 4.13.0 In favor of static::get_widget_slug()
	 * @todo remove after 2021-08-01
	 *
	 * @return string The widget slug.
	 */
	public function get_registration_slug();

}