computed-async-mobx/built/test/throttledComputedTests.js

Define a computed by returning a Promise

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    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) : adopt(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 };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
var util_1 = require("./util");
var delay_1 = require("./delay");
var mobx_1 = require("mobx");
var index_1 = require("../src/index");
function getInsideReaction(getter) {
    var result = undefined;
    var stop = mobx_1.autorun(function () {
        result = getter();
    });
    stop();
    return result;
}
util_1.testStrictness("throttledComputed - synchronous at first", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
    var o, r, results, stop;
    return __generator(this, function (_a) {
        switch (_a.label) {
            case 0:
                o = mobx_1.observable({ x: 1, y: 2 });
                r = index_1.throttledComputed(function () { return o.x + o.y; }, 50);
                assert.equal(getInsideReaction(function () { return r.get(); }), 3, "Initial computation is synchronous");
                mobx_1.runInAction(function () { return o.x = 5; });
                assert.equal(getInsideReaction(function () { return r.get(); }), 7, "Subsequent computations outside reactive contexts are also synchronous");
                mobx_1.runInAction(function () { return o.x = 6; });
                assert.equal(getInsideReaction(function () { return r.get(); }), 8, "Ditto");
                results = [];
                stop = mobx_1.autorun(function () { return results.push(r.get()); });
                assert.deepEqual(results, [8]);
                mobx_1.runInAction(function () { return o.x = 3; });
                assert.deepEqual(results, [8], "Reactive contexts don't see immediate changes");
                return [4 /*yield*/, util_1.waitForLength(results, 2)];
            case 1:
                _a.sent();
                assert.deepEqual(results, [8, 5], "But do see delayed changes");
                mobx_1.runInAction(function () { return o.x = 10; });
                mobx_1.runInAction(function () { return o.x = 20; });
                return [4 /*yield*/, util_1.waitForLength(results, 3)];
            case 2:
                _a.sent();
                assert.deepEqual(results, [8, 5, 22], "Changes are batched by throttling");
                stop();
                return [2 /*return*/];
        }
    });
}); });
util_1.testStrictness("throttledComputed - propagates exceptions", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
    var o, r, results, stop;
    return __generator(this, function (_a) {
        switch (_a.label) {
            case 0:
                o = new util_1.Obs(false);
                r = index_1.throttledComputed(function () {
                    if (o.get()) {
                        throw new Error("Badness");
                    }
                    return 1;
                }, 50);
                assert.equal(getInsideReaction(function () { return r.get(); }), 1, "Initial computation is synchronous");
                results = [];
                stop = mobx_1.autorun(function () {
                    try {
                        results.push(r.get());
                    }
                    catch (x) {
                        results.push(x.message);
                    }
                });
                assert.deepEqual(results, [1]);
                mobx_1.runInAction(function () { return o.set(true); });
                assert.deepEqual(results, [1], "Reactive contexts don't see immediate changes");
                return [4 /*yield*/, util_1.waitForLength(results, 2)];
            case 1:
                _a.sent();
                assert.deepEqual(results, [1, "Badness"], "But do see delayed changes");
                mobx_1.runInAction(function () { return o.set(false); });
                mobx_1.runInAction(function () { return o.set(true); });
                mobx_1.runInAction(function () { return o.set(false); });
                return [4 /*yield*/, util_1.waitForLength(results, 3)];
            case 2:
                _a.sent();
                assert.deepEqual(results, [1, "Badness", 1], "Changes are batched by throttling");
                mobx_1.runInAction(function () { return o.set(true); });
                return [4 /*yield*/, delay_1.delay(1)];
            case 3:
                _a.sent();
                mobx_1.runInAction(function () { return o.set(false); });
                mobx_1.runInAction(function () { return o.set(true); });
                return [4 /*yield*/, util_1.waitForLength(results, 4)];
            case 4:
                _a.sent();
                assert.deepEqual(results, [1, "Badness", 1, "Badness"], "Changes are batched again");
                stop();
                return [2 /*return*/];
        }
    });
}); });
util_1.testStrictness("throttledComputed - can be refreshed", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
    var counter, r, trace, stop;
    return __generator(this, function (_a) {
        counter = 0;
        r = index_1.throttledComputed(function () { return ++counter; }, 10);
        trace = [];
        stop = mobx_1.autorun(function () { return trace.push(r.get()); });
        assert.deepEqual(trace, [1], "Initial value appears synchronously");
        r.refresh();
        assert.deepEqual(trace, [1, 2], "Second value appears synchronously");
        stop();
        return [2 /*return*/];
    });
}); });
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