should_load_block_assets_on_demand

Returning false loads all block assets, regardless of whether they are rendered in a page or not. Returning true loads block assets only when they are rendered. The default value of the filter depends on the result of {@see \wp_should_load_separate_core_block_assets()}, which controls whether Core block stylesheets should be loaded separately or via a combined 'wp-block-library' stylesheet.

// rejestracja funkcji zwrotnej
add_filter( 'should_load_block_assets_on_demand', 'twoja_funkcja' );

function twoja_funkcja($param_1) {
	// Twój kod
}