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action is not described

admin_print_scripts-widgets.php action-hook . WP 1.0

This action is documented in wp-admin/admin-header.php

Usage

add_action( 'admin_print_scripts-widgets.php', 'action_function_name_9357' );
function action_function_name_9357(){
	// action...
}

Where the hook is called

WP_Customize_Widgets::print_scripts()
admin_print_scripts-widgets.php
wp-includes/class-wp-customize-widgets.php 658 
do_action( 'admin_print_scripts-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

Where in WP core the hook is used WordPress

wp-includes/class-wp-customize-widgets.php 75 
add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );
wp-includes/class-wp-customize-widgets.php 111 
add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );
wp-includes/class-wp-customize-widgets.php 66 
add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );