woocommerce-paypal-payments/modules/ppcp-blocks/resources/js/Bootstrap/BlockCheckoutMessagesBootstrap.js

import MessagesBootstrap from "../../../../ppcp-button/resources/js/modules/ContextBootstrap/MessagesBootstap";
import {debounce} from "../Helper/debounce";

class BlockCheckoutMessagesBootstrap {
    constructor(scriptData) {
        this.messagesBootstrap = new MessagesBootstrap(scriptData, null);
        this.lastCartTotal = null;
    }

    init() {
        this.messagesBootstrap.init();

        this._updateCartTotal();

        if (wp.data?.subscribe) {
            wp.data.subscribe(debounce(() => {
                this._updateCartTotal();
            }, 300));
        }
    }

    /**
     * @private
     */
    _getCartTotal() {
        if (!wp.data.select) {
            return null;
        }

        const cart = wp.data.select('wc/store/cart')
        if (!cart) {
            return null;
        }

        const totals = cart.getCartTotals();
        return parseInt(totals.total_price, 10) / 10 ** totals.currency_minor_unit;
    }

    /**
     * @private
     */
    _updateCartTotal() {
        const currentTotal = this._getCartTotal();
        if (currentTotal === null) {
            return;
        }

        if (currentTotal !== this.lastCartTotal) {
            this.lastCartTotal = currentTotal;
            jQuery(document.body).trigger('ppcp_block_cart_total_updated', [currentTotal]);
        }
    }
}

export default BlockCheckoutMessagesBootstrap;