resourcex/lib/resources.js

ResourceX - Utilities to wrap global variables into rxjs observables with **reduced** learning curve

var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
import { BehaviorSubject } from 'rxjs';
import { wrapMiddleware } from './middleware';
var _predef = new Set([
    'value',
    'getValue',
    'next',
    'observers',
    'closed',
    'isStopped',
    'hasError',
    'thrownError',
    'lift',
    'error',
    'complete',
    'unsubscribe',
    'asObservable',
    'source',
    'operator',
    'pipe',
    'subscribe',
    'lift',
    'forEach',
    'toPromise',
]);
var checkMethod = function (name) {
    if (_predef.has(name))
        throw Error("\"" + name + "\" cannot be overwritten!!!");
};
export function Resource(init, actions, middleware, initHook) {
    var _this = this;
    if (actions === void 0) { actions = {}; }
    if (middleware === void 0) { middleware = function (x) { return __awaiter(_this, void 0, void 0, function () { return __generator(this, function (_a) {
        return [2, x];
    }); }); }; }
    if (initHook === void 0) { initHook = function (x) { return x; }; }
    var subject = new BehaviorSubject(initHook(init));
    var EMPTY_PROTO = {};
    return Object.assign(subject, Object.keys(actions).reduce(function (acc, k) {
        var _a;
        checkMethod(k);
        var action = function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments[_i];
            }
            return __awaiter(_this, void 0, void 0, function () {
                var state, val, snapshot, result;
                return __generator(this, function (_a) {
                    switch (_a.label) {
                        case 0:
                            state = subject.getValue();
                            return [4, actions[k].apply(actions, [state].concat(args))];
                        case 1:
                            val = _a.sent();
                            snapshot = { val: val, args: args, state: state, action: k };
                            return [4, middleware(snapshot)];
                        case 2:
                            result = (_a.sent()).val;
                            subject.next(__assign({}, subject.getValue(), result));
                            return [2, result];
                    }
                });
            });
        };
        return __assign({}, acc, (_a = {}, _a[k] = action, _a));
    }, EMPTY_PROTO));
}
export function NaiveResource(init) {
    var _this = this;
    return Resource(init, { set: function (_, val) { return __awaiter(_this, void 0, void 0, function () { return __generator(this, function (_a) {
            return [2, val];
        }); }); } });
}
export function LocalStorageResource(key, init, actions) {
    if (actions === void 0) { actions = {}; }
    var middleware = function (_a) {
        var val = _a.val;
        window.localStorage.setItem(key, JSON.stringify(val));
        return val;
    };
    var initHook = function (x) {
        var lsv = window.localStorage.getItem(key);
        if (!lsv)
            window.localStorage.setItem(key, JSON.stringify(x));
        return lsv ? JSON.parse(lsv) : x;
    };
    return Resource(init, actions, wrapMiddleware([middleware]), initHook);
}