ngx-subscribe/lib/src/subscribe.js

Subscribe decorator to be used in Angular 2+ components, it will automatically subscribe and cleanup observables to component properties.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function setValue(shadow, prop, value) {
    if (!shadow.__value)
        shadow.__value = {};
    if (shadow.__value[prop] !== value) {
        shadow.__value[prop] = value;
        if (shadow.changeDetector)
            shadow.changeDetector.markForCheck();
    }
}
function isFunction(obj) {
    return !!(obj && obj.constructor && obj.call && obj.apply);
}
function getValue(shadow, prop, defaultValue) {
    if (!shadow.__value) {
        return isFunction(defaultValue) ? defaultValue() : defaultValue;
    }
    return shadow.__value[prop];
}
function subscribe(shadow, prop, obs) {
    if (!shadow.__subs)
        shadow.__subs = {};
    shadow.__subs[prop] = obs.subscribe(function (value) { return setValue(shadow, prop, value); });
}
function unsubscribe(shadow, prop) {
    if (!shadow.__subs)
        return;
    var sub = shadow.__subs[prop];
    if (sub) {
        sub.unsubscribe();
        delete shadow.__subs[prop];
    }
}
function unsubscribeAll() {
    var self = this;
    if (!self.__subs)
        return;
    for (var _i = 0, _a = Object.getOwnPropertyNames(self.__subs); _i < _a.length; _i++) {
        var prop = _a[_i];
        self.__subs[prop].unsubscribe();
    }
}
function onDestroy() {
    var self = this;
    if (self.__ngOnDestroy)
        self.__ngOnDestroy();
    self.__unsubscribeAll();
}
function likeObservable(maybeObservable) {
    return !!maybeObservable && typeof (maybeObservable.subscribe) === 'function';
}
/**
 * Will define property which will subscribe to the given Observable on set and will return last emited value on get.
 *
 * @param defaultValue Default value which will be used till observable will emit its value for the first time.
 */
function Subscribe(defaultValue) {
    return function (target, propertyKey) {
        var proto = target.constructor.prototype;
        if (!proto['__unsubscribeAll']) {
            var ngOnDestroy = proto['ngOnDestroy'];
            if (ngOnDestroy)
                proto['__ngOnDestroy'] = ngOnDestroy;
            proto['__unsubscribeAll'] = unsubscribeAll;
            proto['ngOnDestroy'] = onDestroy;
        }
        var desc = {
            get: function () { return getValue(this, propertyKey, defaultValue); },
            set: function (value) {
                var self = this;
                unsubscribe(self, propertyKey);
                // looks like Observable?
                if (likeObservable(value)) {
                    subscribe(self, propertyKey, value);
                }
                else {
                    setValue(self, propertyKey, value);
                }
            }
        };
        return desc;
    };
}
exports.Subscribe = Subscribe;
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