typescript2.4 | 易学教程

Observable.forkJoin() TS2322 error after updating to TypeScript 2.4.1 and Rxjs 5.4.2

阅读更多关于 Observable.forkJoin() TS2322 error after updating to TypeScript 2.4.1 and Rxjs 5.4.2

问题 In our angular 4.2.4 application, we use RxJS's Observable.forkJoin in a number of places to return heterogeneous types. For example: private fleet: Aircraft[]; private contractList: string[]; Observable.forkJoin([ this.fleetService.getFleet(), this.fleetService.getContractList() ]).subscribe( next => { this.fleet = results[0]; this.contractList = results[1]; }, error => console.error ); with the following service signatures: getFleet(): Observable<Aircraft[]> { ... } getContractList():

Could not find Angular Material core theme

阅读更多关于 Could not find Angular Material core theme

问题 I have added angular material2 package to my project. However, I get the following warning message in browser i have created a custom scss file and imported the packages still it throw's warning message: Could not find Angular Material core theme. Most Material components may not work as expected. For more info refer to the theming guide: material.es5.js?7d89:180 https://material.angular.io/guide/theming I have created styles.scss file and included following configuration file Package "

Download a webpage in pdf format using angular4

阅读更多关于 Download a webpage in pdf format using angular4

问题 I am new for angular 4. I need to download a HTML webpage in pdf format and the html webpage contains angular controls like input [(ngModel)] , radio button [checked] . Rather than showing the control values it shows undefined in the pdf file. I tried using jsPdf & html2Pdf But it throws error Error: You need either https://github.com/niklasvh/html2canvas or https://github.com/cburgmer/rasterizeHTML.js at Object.jsPDFAPI.addHTML (jspdf.debug.js?6964:4049) Code for TS File: import { Component,

TypeScript ES dynamic `import()`

阅读更多关于 TypeScript ES dynamic `import()`

问题 While using the new TypeScript feature, so called ES Dynamic Imports, I am not able to run the code of my isomorphic app on the server side using ts-node . It seems like the error does not occur when using the webpack module loader which transpiles the code in it's own way and running resulting files in a browser. The error which I've got: case 0: return [4 /*yield*/, import("./component/main")]; ^^^^^^ SyntaxError: Unexpected token import Usually TypeScript transpiles the import expression

TypeScript's string enums - “Type … is not assignable to type …”

阅读更多关于 TypeScript's string enums - “Type … is not assignable to type …”

I have recently upgraded the version of TypeScript from 2.3.4 to 2.4.0 hoping to use the string enums . To my dismay, however, I have been greeted with the error messages: Severity Code Description Project File Line Suppression State Error TS2322 Type '"E"' is not assignable to type 'StepType'. ClientApp (tsconfig project) Z:\SMART\Smart\Smart\ClientApp\app\models\process.model.ts 17 Active Error TS2322 Type '"S"' is not assignable to type 'StepType'. ClientApp (tsconfig project) Z:\SMART\Smart\Smart\ClientApp\app\models\process.model.ts 14 Active Error TS2322 Type '"A"' is not assignable to

How do I get around this “Subject incorrectly extends Observable” error in TypeScript 2.4 and RxJS 5.x?

阅读更多关于 How do I get around this “Subject incorrectly extends Observable” error in TypeScript 2.4 and RxJS 5.x?

When I compile, I get the following compiler error in the RxJS declaration files: node_modules/rxjs/Subject.d.ts(16,22): error TS2415: Class 'Subject<T>' incorrectly extends base class 'Observable<T>'. Types of property 'lift' are incompatible. Type '<R>(operator: Operator<T, R>) => Observable<T>' is not assignable to type '<R>(operator: Operator<T, R>) => Observable<R>'. Type 'Observable<T>' is not assignable to type 'Observable<R>'. Type 'T' is not assignable to type 'R'. What's going on here, and how do I get around this without downgrading to TypeScript 2.3 or earlier? Solution RxJS 5.4.2

TypeScript's string enums - “Type … is not assignable to type …”

阅读更多关于 TypeScript's string enums - “Type … is not assignable to type …”

问题 I have recently upgraded the version of TypeScript from 2.3.4 to 2.4.0 hoping to use the string enums. To my dismay, however, I have been greeted with the error messages: Severity Code Description Project File Line Suppression State Error TS2322 Type '"E"' is not assignable to type 'StepType'. ClientApp (tsconfig project) Z:\SMART\Smart\Smart\ClientApp\app\models\process.model.ts 17 Active Error TS2322 Type '"S"' is not assignable to type 'StepType'. ClientApp (tsconfig project) Z:\SMART

How do I get around this “Subject incorrectly extends Observable” error in TypeScript 2.4 and RxJS 5.x?

阅读更多关于 How do I get around this “Subject incorrectly extends Observable” error in TypeScript 2.4 and RxJS 5.x?

问题 When I compile, I get the following compiler error in the RxJS declaration files: node_modules/rxjs/Subject.d.ts(16,22): error TS2415: Class 'Subject<T>' incorrectly extends base class 'Observable<T>'. Types of property 'lift' are incompatible. Type '<R>(operator: Operator<T, R>) => Observable<T>' is not assignable to type '<R>(operator: Operator<T, R>) => Observable<R>'. Type 'Observable<T>' is not assignable to type 'Observable<R>'. Type 'T' is not assignable to type 'R'. What's going on