woocommerce-paypal-payments/modules/ppcp-wc-gateway/resources/js/common/display-manager/condition/JsVariableCondition.js

import BaseCondition from "./BaseCondition";

class JsVariableCondition extends BaseCondition {

    register() {
        jQuery(document).on('ppcp-display-change', () => {
            const status = this.check();
            if (status !== this.status) {
                this.status = status;
                this.triggerUpdate();
            }
        });

        this.status = this.check();
    }

    check() {
        let value = document[this.config.variable];
        return this.config.value === value;
    }

}

export default JsVariableCondition;