类方法的扩展通用参数不构建

Question

I got an issue while building an angular project with ng build .

public update (item: T extends IModel): Observable<T> {
  return this.http.put<any>(`${this.api}/${this.resource}/${item.id}`, item);
}

It say, it expect a ',' in (item: T extends IModel) .

Any idea how to make it build? It works well with ng serve and to looks correct to me.

Answer 1

You need to declare the type parameter like this:

public update<T extends IModel>(item: T): Observable<T> {
  return this.http.put<any>(`${this.api}/${this.resource}/${item.id}`, item);
}

Answer 2

Thanks

I just found a way. What i have done:

export class ResourceService<T extends IModel> {
   ...

  public update (item: T): Observable<T> {
    return this.http.put<any>(`${this.api}/${this.resource}/${item.id}`, item);
  }
}

My interface is:

 export interface IModel {
  id: string;
 }