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Edit File: firstValueFrom-spec.js
"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 rxjs_1 = require("rxjs"); var chai_1 = require("chai"); var operators_1 = require("rxjs/operators"); describe('firstValueFrom', function () { it('should emit the first value as a promise', function () { return __awaiter(void 0, void 0, void 0, function () { var finalized, source, result; return __generator(this, function (_a) { switch (_a.label) { case 0: finalized = false; source = (0, rxjs_1.interval)(10).pipe((0, operators_1.finalize)(function () { return (finalized = true); })); return [4, (0, rxjs_1.firstValueFrom)(source)]; case 1: result = _a.sent(); (0, chai_1.expect)(result).to.equal(0); (0, chai_1.expect)(finalized).to.be.true; return [2]; } }); }); }); it('should support a default value', function () { return __awaiter(void 0, void 0, void 0, function () { var source, result; return __generator(this, function (_a) { switch (_a.label) { case 0: source = rxjs_1.EMPTY; return [4, (0, rxjs_1.firstValueFrom)(source, { defaultValue: 0 })]; case 1: result = _a.sent(); (0, chai_1.expect)(result).to.equal(0); return [2]; } }); }); }); it('should support an undefined config', function () { return __awaiter(void 0, void 0, void 0, function () { var source, error, err_1; return __generator(this, function (_a) { switch (_a.label) { case 0: source = rxjs_1.EMPTY; error = null; _a.label = 1; case 1: _a.trys.push([1, 3, , 4]); return [4, (0, rxjs_1.firstValueFrom)(source, undefined)]; case 2: _a.sent(); return [3, 4]; case 3: err_1 = _a.sent(); error = err_1; return [3, 4]; case 4: (0, chai_1.expect)(error).to.be.an.instanceOf(rxjs_1.EmptyError); return [2]; } }); }); }); it('should error for empty observables', function () { return __awaiter(void 0, void 0, void 0, function () { var source, error, err_2; return __generator(this, function (_a) { switch (_a.label) { case 0: source = rxjs_1.EMPTY; error = null; _a.label = 1; case 1: _a.trys.push([1, 3, , 4]); return [4, (0, rxjs_1.firstValueFrom)(source)]; case 2: _a.sent(); return [3, 4]; case 3: err_2 = _a.sent(); error = err_2; return [3, 4]; case 4: (0, chai_1.expect)(error).to.be.an.instanceOf(rxjs_1.EmptyError); return [2]; } }); }); }); it('should error for errored observables', function () { return __awaiter(void 0, void 0, void 0, function () { var source, error, err_3; return __generator(this, function (_a) { switch (_a.label) { case 0: source = (0, rxjs_1.throwError)(function () { return new Error('blorp!'); }); error = null; _a.label = 1; case 1: _a.trys.push([1, 3, , 4]); return [4, (0, rxjs_1.firstValueFrom)(source)]; case 2: _a.sent(); return [3, 4]; case 3: err_3 = _a.sent(); error = err_3; return [3, 4]; case 4: (0, chai_1.expect)(error).to.be.an.instanceOf(Error); (0, chai_1.expect)(error.message).to.equal('blorp!'); return [2]; } }); }); }); it('should work with a synchronous observable', function () { return __awaiter(void 0, void 0, void 0, function () { var finalized, source, result; return __generator(this, function (_a) { switch (_a.label) { case 0: finalized = false; source = (0, rxjs_1.of)('apples', 'bananas').pipe((0, operators_1.finalize)(function () { return (finalized = true); })); return [4, (0, rxjs_1.firstValueFrom)(source)]; case 1: result = _a.sent(); (0, chai_1.expect)(result).to.equal('apples'); (0, chai_1.expect)(finalized).to.be.true; return [2]; } }); }); }); it('should stop listening to a synchronous observable when resolved', function () { return __awaiter(void 0, void 0, void 0, function () { var sideEffects, synchronousObservable, result; return __generator(this, function (_a) { switch (_a.label) { case 0: sideEffects = []; synchronousObservable = new rxjs_1.Observable(function (subscriber) { for (var i = 0; !subscriber.closed && i < 10; i++) { sideEffects.push(i); subscriber.next(i); } }); return [4, (0, rxjs_1.firstValueFrom)(synchronousObservable)]; case 1: result = _a.sent(); (0, chai_1.expect)(sideEffects).to.deep.equal([0]); return [2]; } }); }); }); }); //# sourceMappingURL=firstValueFrom-spec.js.map