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			wp_add_editor_classic_theme_styles is deprecated since version 6.8.0!
Alternative: wp_enqueue_classic_theme_styles
Alternative: wp_enqueue_classic_theme_styles
wp_add_editor_classic_theme_styles › WordPress Function
Since6.1.0
Deprecated6.8.0
› wp_add_editor_classic_theme_styles ( $editor_settings )
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| Returns: | 
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| Defined at: | 
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Loads classic theme styles on classic themes in the editor.
This is used for backwards compatibility for Button and File blocks specifically.Source
function wp_add_editor_classic_theme_styles( $editor_settings ) {
	_deprecated_function( __FUNCTION__, '6.8.0', 'wp_enqueue_classic_theme_styles' );
	if ( wp_theme_has_theme_json() ) {
		return $editor_settings;
	}
	$suffix               = wp_scripts_get_suffix();
	$classic_theme_styles = ABSPATH . WPINC . "/css/classic-themes$suffix.css";
	/*
	 * This follows the pattern of get_block_editor_theme_styles,
	 * but we can't use get_block_editor_theme_styles directly as it
	 * only handles external files or theme files.
	 */
	$classic_theme_styles_settings = array(
		'css'            => file_get_contents( $classic_theme_styles ),
		'__unstableType' => 'core',
		'isGlobalStyles' => false,
	);
	// Add these settings to the start of the array so that themes can override them.
	array_unshift( $editor_settings['styles'], $classic_theme_styles_settings );
	return $editor_settings;
}