typedux/dist/commonjs/store/StateObserver.js

Slightly adjusted Redux (awesome by default) for TS

"use strict";
/**
 * Responsible for observing
 * and notifying store listeners
 * with provided paths
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.StateObserver = void 0;
const logger_proxy_1 = require("@3fv/logger-proxy");
const log = logger_proxy_1.getLogger(__filename);
class StateObserver {
    //constructor(s:string | Array<string|number>,private handler:TStateChangeHandler<S,T>) {
    constructor(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('.')) : []
    }
    onChange(state) {
        const newValue = this.selector(state); // this.keyPath.length ? getNewValue(state,this.keyPath) : state
        // Check for change/diff
        const 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;
    }
}
exports.StateObserver = StateObserver;
exports.default = StateObserver;
//# sourceMappingURL=StateObserver.js.map