How to fix error TS2339: Property 'version' does not exist on type 'never'.

I encountered this error in Typescript while doing something pretty straightforward. In my component file: 

export class BookDownloadModalComponent {
  versions!: [];

"versions" is an array which I'm loading from an API. In my template I did the following (this is Angular, btw):

<div *ngFor="let bookversion of versions" class="w-full">
     {{ bookversion.version }}
</div>

This gave me this error:

TS2339: Property 'version' does not exist on type 'never'.

Solution

You have to define the array as an array of any type. This becomes:

export class BookDownloadModalComponent {
  versions!: any[];

By default, TypeScript defines empty arrays as never[]. That is an array that always will be empty. A bizarre thing of TS. More info here.