@uifabric/utilities/lib/GlobalSettings.js

import { getWindow } from './dom/getWindow';
/**
 * Storing global state in local module variables has issues when more than one copy
 * if the module gets loaded on the page (due to a bundling error or simply by consuming
 * a prebundled script.)
 *
 * This file contains helpers to deal with the getting and setting local state, and allows
 * callers to get called back when it mutates.
 */
var GLOBAL_SETTINGS_PROP_NAME = '__globalSettings__';
var CALLBACK_STATE_PROP_NAME = '__callbacks__';
var _counter = 0;
/**
 * Global settings helper, which stores settings in the global (window) namespace.
 * If window is not provided, it will store settings in module scope. Provides a
 * way to observe changes as well when their values change.
 *
 * @public
 * {@docCategory GlobalSettings}
 */
var GlobalSettings = /** @class */ (function () {
    function GlobalSettings() {
    }
    GlobalSettings.getValue = function (key, defaultValue) {
        var globalSettings = _getGlobalSettings();
        if (globalSettings[key] === undefined) {
            globalSettings[key] = typeof defaultValue === 'function' ? defaultValue() : defaultValue;
        }
        return globalSettings[key];
    };
    GlobalSettings.setValue = function (key, value) {
        var globalSettings = _getGlobalSettings();
        var callbacks = globalSettings[CALLBACK_STATE_PROP_NAME];
        var oldValue = globalSettings[key];
        if (value !== oldValue) {
            globalSettings[key] = value;
            var changeDescription = {
                oldValue: oldValue,
                value: value,
                key: key,
            };
            for (var id in callbacks) {
                if (callbacks.hasOwnProperty(id)) {
                    callbacks[id](changeDescription);
                }
            }
        }
        return value;
    };
    GlobalSettings.addChangeListener = function (cb) {
        // Note: we use generated ids on the callbacks to create a map of the callbacks, which optimizes removal.
        // (It's faster to delete a key than it is to look up the index of an object and splice an array.)
        var id = cb.__id__;
        var callbacks = _getCallbacks();
        if (!id) {
            id = cb.__id__ = String(_counter++);
        }
        callbacks[id] = cb;
    };
    GlobalSettings.removeChangeListener = function (cb) {
        var callbacks = _getCallbacks();
        delete callbacks[cb.__id__];
    };
    return GlobalSettings;
}());
export { GlobalSettings };
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function _getGlobalSettings() {
    var _a;
    var win = getWindow();
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    var globalObj = win || {};
    if (!globalObj[GLOBAL_SETTINGS_PROP_NAME]) {
        globalObj[GLOBAL_SETTINGS_PROP_NAME] = (_a = {},
            _a[CALLBACK_STATE_PROP_NAME] = {},
            _a);
    }
    return globalObj[GLOBAL_SETTINGS_PROP_NAME];
}
function _getCallbacks() {
    var globalSettings = _getGlobalSettings();
    return globalSettings[CALLBACK_STATE_PROP_NAME];
}
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