WP_Block_Styles_Registry::get_registered( string $block_name, string $block_style_name )

Source

File: wp-includes/class-wp-block-styles-registry.php

public function get_registered( $block_name, $block_style_name ) {
		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {
			return null;
		}

		return $this->registered_block_styles[ $block_name ][ $block_style_name ];
	}