computed-async-mobx
Version:
Define a computed by returning a Promise
354 lines • 17.5 kB
JavaScript
"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");
util_1.testStrictness("promisedComputed - can't be used outside of reactive contexts", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r;
return __generator(this, function (_a) {
o = mobx_1.observable({ x: 1, y: 2 });
r = index_1.promisedComputed(undefined, function () { return __awaiter(void 0, void 0, void 0, function () {
var result;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
result = o.x + o.y;
return [4 /*yield*/, delay_1.delay(100)];
case 1:
_a.sent();
return [2 /*return*/, result];
}
});
}); });
assert.throws(function () { return r.get(); }, /inside reactions/);
return [2 /*return*/];
});
}); });
util_1.testStrictness("promisedComputed - can use getNonReactive outside of reactive contexts", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
o = mobx_1.observable({ x: 1, y: 2 });
r = index_1.promisedComputed(undefined, function () { return __awaiter(void 0, void 0, void 0, function () {
var result;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
result = o.x + o.y;
return [4 /*yield*/, delay_1.delay(100)];
case 1:
_a.sent();
return [2 /*return*/, result];
}
});
}); });
assert.equal(r.getNonReactive(), undefined);
stop = mobx_1.autorun(function () { return r.get(); });
_a.label = 1;
case 1:
if (!(r.getNonReactive() === undefined)) return [3 /*break*/, 3];
return [4 /*yield*/, delay_1.delay(5)];
case 2:
_a.sent();
return [3 /*break*/, 1];
case 3:
stop();
assert.equal(r.getNonReactive(), 3);
return [2 /*return*/];
}
});
}); });
util_1.testStrictness("promisedComputed - transitions to new values", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r, trace, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
o = mobx_1.observable({ x: 1, y: 2 });
r = index_1.promisedComputed(101, function () { return __awaiter(void 0, void 0, void 0, function () {
var result;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
result = o.x + o.y;
return [4 /*yield*/, delay_1.delay(10)];
case 1:
_a.sent();
return [2 /*return*/, result];
}
});
}); });
trace = [];
stop = mobx_1.autorun(function () { return trace.push(r.get()); });
assert.deepEqual(trace, [101], "No new value until promise resolves");
return [4 /*yield*/, util_1.waitForLength(trace, 2)];
case 1:
_a.sent();
assert.deepEqual(trace, [101, 3], "First proper value appears");
mobx_1.runInAction(function () { return o.x = 5; });
assert.deepEqual(trace, [101, 3], "No value until promise resolves [2]");
return [4 /*yield*/, util_1.waitForLength(trace, 3)];
case 2:
_a.sent();
assert.deepEqual(trace, [101, 3, 7], "Second value appears");
stop();
return [2 /*return*/];
}
});
}); });
util_1.testStrictness("promisedComputed - busy property works by itself", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r, trace, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
o = mobx_1.observable({ x: 1, y: 2 });
r = index_1.promisedComputed(undefined, function () { return __awaiter(void 0, void 0, void 0, function () {
var result;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
result = o.x + o.y;
return [4 /*yield*/, delay_1.delay(10)];
case 1:
_a.sent();
return [2 /*return*/, result];
}
});
}); });
trace = [];
stop = mobx_1.autorun(function () { return trace.push(r.busy); });
assert.deepEqual(trace, [true], "Is initially busy");
return [4 /*yield*/, util_1.waitForLength(trace, 2)];
case 1:
_a.sent();
assert.deepEqual(trace, [true, false], "Busy transitions to false");
mobx_1.runInAction(function () { return o.x = 5; });
assert.deepEqual(trace, [true, false, true], "Synchronously transitions to true");
return [4 /*yield*/, util_1.waitForLength(trace, 4)];
case 2:
_a.sent();
assert.deepEqual(trace, [true, false, true, false], "Second transition to false");
stop();
return [2 /*return*/];
}
});
}); });
util_1.testStrictness("promisedComputed - busy property interleaves with value changes", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r, trace, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
o = mobx_1.observable({ x: 1, y: 2 });
r = index_1.promisedComputed(undefined, function () { return __awaiter(void 0, void 0, void 0, function () {
var result;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
result = o.x + o.y;
return [4 /*yield*/, delay_1.delay(10)];
case 1:
_a.sent();
return [2 /*return*/, result];
}
});
}); });
trace = [];
stop = mobx_1.autorun(function () { return trace.push({ value: r.get(), busy: r.busy }); });
assert.deepEqual(trace, [
{ value: undefined, busy: true }
], "No value until promise resolves");
return [4 /*yield*/, util_1.waitForLength(trace, 2)];
case 1:
_a.sent();
assert.deepEqual(trace, [
{ value: undefined, busy: true },
{ value: 3, busy: false }
], "Initial value appears");
mobx_1.runInAction(function () { return o.x = 5; });
assert.deepEqual(trace, [
{ value: undefined, busy: true },
{ value: 3, busy: false },
{ value: 3, busy: true }
], "No value until promise resolves [2]");
return [4 /*yield*/, util_1.waitForLength(trace, 4)];
case 2:
_a.sent();
assert.deepEqual(trace, [
{ value: undefined, busy: true },
{ value: 3, busy: false },
{ value: 3, busy: true },
{ value: 7, busy: false }
], "Second value appears");
stop();
return [2 /*return*/];
}
});
}); });
util_1.testStrictness("promisedComputed - propagates exceptions", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r, trace, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
o = new util_1.Obs(false);
r = index_1.promisedComputed(101, function () { return __awaiter(void 0, void 0, void 0, function () {
var shouldThrow;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
shouldThrow = o.get();
return [4 /*yield*/, delay_1.delay(10)];
case 1:
_a.sent();
if (shouldThrow) {
throw new Error("Badness");
}
return [2 /*return*/, 1];
}
});
}); });
trace = [];
stop = mobx_1.autorun(function () {
try {
trace.push(r.get());
}
catch (x) {
trace.push(x.message);
}
});
assert.deepEqual(trace, [101]);
return [4 /*yield*/, util_1.waitForLength(trace, 2)];
case 1:
_a.sent();
assert.deepEqual(trace, [101, 1]);
mobx_1.runInAction(function () { return o.set(true); });
assert.deepEqual(trace, [101, 1], "Reactive contexts don't seem immediate changes");
return [4 /*yield*/, util_1.waitForLength(trace, 3)];
case 2:
_a.sent();
assert.deepEqual(trace, [101, 1, "Badness"], "But do see delayed changes");
mobx_1.runInAction(function () { return o.set(false); });
return [4 /*yield*/, util_1.waitForLength(trace, 4)];
case 3:
_a.sent();
assert.deepEqual(trace, [101, 1, "Badness", "Badness"], "Transition to busy triggers new exception");
return [4 /*yield*/, util_1.waitForLength(trace, 5)];
case 4:
_a.sent();
assert.deepEqual(trace, [101, 1, "Badness", "Badness", 1], "And reverts back to non-throwing");
stop();
return [2 /*return*/];
}
});
}); });
util_1.testStrictness("promisedComputed - is fully synchronous if value is not a promise", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var o, r, trace, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
o = new util_1.Obs("sync");
r = index_1.promisedComputed("never", function () {
var v = o.get();
if (v === "throw") {
throw new Error(v);
}
return v === "async" ? delay_1.delay(10).then(function () { return v; }) : v;
});
trace = [];
stop = mobx_1.autorun(function () {
try {
trace.push(r.get());
}
catch (x) {
trace.push("error: " + x.message);
}
});
assert.deepEqual(trace, ["sync"], "Synchronously has value");
mobx_1.runInAction(function () { return o.set("sync2"); });
assert.deepEqual(trace, ["sync", "sync2"], "Synchronously transitions");
mobx_1.runInAction(function () { return o.set("async"); });
assert.deepEqual(trace, ["sync", "sync2"], "Does not immediately transition to promised value");
return [4 /*yield*/, util_1.waitForLength(trace, 3)];
case 1:
_a.sent();
assert.deepEqual(trace, ["sync", "sync2", "async"], "Eventually transitions");
mobx_1.runInAction(function () { return o.set("throw"); });
assert.deepEqual(trace, ["sync", "sync2", "async", "error: throw"], "Synchronously transitions to throwing");
mobx_1.runInAction(function () { return o.set("sync3"); });
assert.deepEqual(trace, ["sync", "sync2", "async", "error: throw", "sync3"], "Synchronously transitions to normal");
stop();
return [2 /*return*/];
}
});
}); });
util_1.testStrictness("promisedComputed - can be refreshed", function (assert) { return __awaiter(void 0, void 0, void 0, function () {
var counter, r, trace, stop;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
counter = 0;
r = index_1.promisedComputed(0, function () { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, delay_1.delay(10)];
case 1:
_a.sent();
return [2 /*return*/, ++counter];
}
});
}); });
trace = [];
stop = mobx_1.autorun(function () { return trace.push(r.get()); });
assert.deepEqual(trace, [0], "No new value until promise resolves");
return [4 /*yield*/, util_1.waitForLength(trace, 2)];
case 1:
_a.sent();
assert.deepEqual(trace, [0, 1], "First proper value appears");
r.refresh();
assert.deepEqual(trace, [0, 1], "No value until promise resolves [2]");
return [4 /*yield*/, util_1.waitForLength(trace, 3)];
case 2:
_a.sent();
assert.deepEqual(trace, [0, 1, 2], "Second value appears");
stop();
return [2 /*return*/];
}
});
}); });
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