block-variation-enqueue.php

function block_variation_example_enqueue() {
    wp_enqueue_script(
        'block-variation-example-script',
        plugins_url( 'index.js', __FILE__ ),
        array( 'wp-blocks', 'wp-dom-ready', 'wp-edit-post' ),
        filemtime( plugin_dir_path( __FILE__ ) . '/block-variation-example.js' )
    );
}
add_action( 'enqueue_block_editor_assets', 'block_variation_example_enqueue' );