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I am new to Typescript. I am trying to use interface as an array type. I structure my literal object by order, though I still get this error :

Type '{ id: number; title: string; image: string; words: string; description: string; }[]' is not assignable to type 'IWordList[]'. Type '{ id: number; title: string; image: string; words: string; description: string; }' is not assignable to type 'IWordList'. Object literal may only specify known properties, and 'id' does not exist in type 'IWordList'.

Notice that the case isn't about 'id' itself, but it is if I added any addtioal property, I get the same error

IWordList.ts

export interface IWordList{
    id : number;
    title : string;
    image : string;
    words : string;
    description : string;
}

wordlistsdata.service.ts

import { Injectable } from '@angular/core';
import { IWordList } from './IWordlist';

@Injectable()
export class WordlistsdataService {

  constructor() { }

  private allWordLists : IWordList[] = 
  [
      {
          id : 1,
          title : "Animals",
          image : "/src/app/images/wordlists/animals_background.jpg",
          words : "cat,elephant,cow,duck",
          description : "sdadasd"
      },
      {   
          id : 2,
          title : "Jobs",
          image : "/src/app/images/wordlists/jobs_background.jpg",
          words : "engineer,farmer,artist,programmer",
          description : "sdadasd"
      }

    ]

  public getWordList() : IWordList[]{
    return this.allWordLists;
  }

  public getOneWordList(id : number) : string[] {
    return 
  }
}

If someone stumbles upon this error i recently get this with webpack dev server and hot moduel reloading. Only solution that works:

Restart webpack dev server so it compiles from scratch

Getting error TS2339: Property does not exist on type for a valid ES6 , When compiled/transpiled through TypeScript it generates error TS2339: Property 'myclassvar' does not exist on type 'MyClass'. If the above  "Property 'items' does not exist on type 'Readonly<{}>'." and "Property 'value' does not exist on type 'Readonly<{}>'." I am trying to create "Add comment where you can upvote and downvote". Also when I refresh the page, the item which is added, is not available anymore. The following code is using React with typescript:

I just copied your code into a Plunker and it worked just fine. You can see my code here: https://plnkr.co/edit/sxcYl5v5jBlfzZ31fHLd?p=preview

See if you can run it from there as well.

Ah ... but this tool requires that I paste the code ... even though you have it above ... so here is the AppModule:

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App ],
  providers: [ WordlistsdataService ],
  bootstrap: [ App ]
})
export class AppModule {}

Property 'from' does not exist on type '{}' · Issue #41674 , Property 'from' does not exist on type '{}' #41674. Open. fr3gu opened this issue on Jan 17 · 22 comments. Open  Subscribe to this blog. error TS2339: Property 'checked' does not exist on type 'HTMLElement'

I had the same error. It was showing up in my build watch but not in Linter, which detects those errors. So I decided to restart the build, and got a new error, pointing to a case where I had created an object without the property that was throwing the error (in your case "id"). Interestingly, Linter had missed that actual error. I fixed this code so that "id" was being defined, and started the build once again. This time it worked with no errors.

Property does not exist on type component ng build --prod, ERROR in src\app\views\home\detalis.component.html(126,21): : Property 'items' does not exist on type 'DetalisComponent'. The type or namespace name 'Pages' does not exist in the namespace 'OfficeDevPnP.Core' (are you missing an assembly reference?)CSOM 3 SharePoint spfx webpart Property 'value' does not exist. sub task errored

Try with this:

export interface IWordList{
    id ?: number;
    title : string;
    image : string;
    words : string;
    description : string;
}

The ? operator allows you to make things optional.

Error TS2339: property 'rows' does not exist on type 'htmlelement , You need to cast the element returned from getElementById to an HTMLTableElement . Try: Hide Copy Code. var table  Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Property 'value' does not exist on type 'Readonly

Property does not exist on type string, "Property 'includes' does not exist on type 'number[]'. That or create a new Type to use Dec 20, 2018 · Hello, I'm sorry, I know that your message is pretty old, but  Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Property 'window' does not exist on type 'Global'. To

Property 'get' does not exist on type 'typeof HttpClient' : Angular2, I use version 4.3.1 and I try to use HttpClient but I can't get any idea why I always keep getting the following error message: Property 'get' does not exist on type  Property 'scopes' does not exist on type 'IntrinsicAttributes & IntrinsicClassAttributes<Content> & Props & { children?: ReactNode; }'. Copy link Quote reply

Property 'courses' does not exist on type 'Object'. : ionic, Property 'courses' does not exist on type 'Object'. When trying to compile for Android I get this error, I can't figure out a way around it. It runs fine when serverd to  The property 'Description' does not exist on type 'SP.Data.TasksListItem'. Make sure to only use property names that are defined by the type. But the tpe exists and the Column Description does also exists.

Comments
  • How does the component code look like that uses this data?
  • I can't reproduce your error in playground, can you? What version of typescript are you using?
  • Thanks, I changed my code by this time. Instead I will read the data from local json file. It's more convenient.By the way, I loved your course "Angular 2 : Getting Started" on Pluarsight. You are phenomenal author. Keep up posting Angular 2 courses; I am loving your teaching way.
  • Thank you so much!
  • Please have a look at this question ( stackoverflow.com/questions/43567722/… ) I tried to create a similar component to the product-detailsa from the course. But I am facing a poroblem with my service. Thanks in advance.