wp-plugin-init/template/resources/js/config/AppConfig.js

CLI to scaffold a PHP plugin boilerplate structure

/**
 * Reads the config object injected by the PHP AssetHandler via
 * wp_localize_script (window.__PLUGIN_GLOBAL__). Centralising access here
 * keeps components free of direct `window` reads and makes the data source
 * easy to mock or swap.
 */
const settings = window.__PLUGIN_GLOBAL__ || {};

const AppConfig = {
    /**
     * @param {string|null} key      Dot-free key, or null for the whole object.
     * @param {*}           fallback Returned when the key is absent.
     */
    get(key = null, fallback = null) {
        if (!key) {
            return settings;
        }

        return key in settings ? settings[key] : fallback;
    },
};

export default AppConfig;