WordPress at a glance
action is not described

woocommerce_blocks_checkout_enqueue_data action-hook . WC 1.0

Usage

add_action( 'woocommerce_blocks_checkout_enqueue_data', 'action_function_name_2858' );
function action_function_name_2858(){
	// action...
}

Where the hook is called

Checkout::enqueue_data()
woocommerce_blocks_checkout_enqueue_data
woocommerce/packages/woocommerce-blocks/src/BlockTypes/Checkout.php 152
do_action( 'woocommerce_blocks_checkout_enqueue_data' );

Where in WP core the hook is used WooCommerce

woocommerce/packages/woocommerce-blocks/src/Payments/Api.php 51
add_action( 'woocommerce_blocks_checkout_enqueue_data', array( $this, 'add_payment_method_script_data' ) );