typedux/dist/umd/store/StateObserver.js

Slightly adjusted Redux (awesome by default) for TS

/**
 * Responsible for observing
 * and notifying store listeners
 * with provided paths
 */
(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports", "@3fv/logger-proxy"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.StateObserver = void 0;
    var logger_proxy_1 = require("@3fv/logger-proxy");
    var log = logger_proxy_1.getLogger(__filename);
    var StateObserver = /** @class */ (function () {
        //constructor(s:string | Array<string|number>,private handler:TStateChangeHandler<S,T>) {
        function StateObserver(selector, handler) {
            this.selector = selector;
            this.handler = handler;
            /**
             * Last value received
             */
            this.cachedValue = undefined;
            /**
             * Flags when the observer has been removed
             *
             * @type {boolean}
             */
            this.removed = false;
            //this.keyPath = path ? ((isArray(path)) ? path : path.split('.')) : []
        }
        StateObserver.prototype.onChange = function (state) {
            var newValue = this.selector(state); // this.keyPath.length ? getNewValue(state,this.keyPath) : state
            // Check for change/diff
            var cachedValue = this.cachedValue;
            if (newValue === cachedValue)
                return false;
            // Update the old ref
            this.cachedValue = newValue;
            //log.debug(`Path ${this.keyPath.join(',')} changed, to`,newValue,'from',cachedValue)
            this.handler(newValue, cachedValue, this);
            return true;
        };
        return StateObserver;
    }());
    exports.StateObserver = StateObserver;
    exports.default = StateObserver;
});
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