WP_Block_Styles_Registry::unregister( string $block_name, string $block_style_name ): bool

Source

 *
 * @param string $block_name       Block type name including namespace.
 * @param string $block_style_name Block style name.
 * @return bool True if the block style was unregistered with success and false otherwise.
 */
public function unregister( $block_name, $block_style_name ) {
	if ( ! $this->is_registered( $block_name, $block_style_name ) ) {
		_doing_it_wrong(
			__METHOD__,
			/* translators: 1: Block name, 2: Block style name. */
			sprintf( __( 'Block "%1$s" does not contain a style named "%2$s".' ), $block_name, $block_style_name ),
			'5.3.0'
		);
		return false;
	}

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