错误TS2345：“菜单”类型的参数无法分配给类型参数

Question

Good day. I'm new to Type Script, using VSCode.

Getting following errors :

error TS2345: Argument of type 'Menu' is not assignable to parameter of type '{ state: string; name: string; type: string; icon: string;
 badge?: undefined; children?: undefine...'

the code :

import { Injectable } from '@angular/core';

export interface BadgeItem {
  type: string;
  value: string;
}

export interface ChildrenItems {
  state: string;
  name: string;
  type?: string;
}

export interface Menu {
  state: string;
  name: string;
  type: string;
  icon: string;
  badge?: BadgeItem[];
  children?: ChildrenItems[];
}

const MENUITEMS = [
  {
    state: '/',
    name: 'HOME',
    type: 'link',
    icon: 'explore'
  },
  {
    state: 'account',
    name: 'ACCOUNT',
    type: 'sub',
    icon: 'explore',
    badge: [
      {type: 'purple', value: 'new'}
    ],
    children: [
        {state: 'users', name: 'USERS'},
    ]
  }
];

@Injectable()
export class MenuService {
  getAll(): Menu[] {
    return MENUITEMS;
  }

  add(menu: Menu) {
    MENUITEMS.push(menu);
  }
}

Any help will be highly appreciated.

Answer 1

Just specify the type of MENUITEMS like below, the warning will go away

const MENUITEMS : Menu[] = [
  {
    state: '/',
    name: 'HOME',
    type: 'link',
    icon: 'explore'
  },
  {
    state: 'account',
    name: 'ACCOUNT',
    type: 'sub',
    icon: 'explore',
    badge: [
      {type: 'purple', value: 'new'}
    ],
    children: [
        {state: 'users', name: 'USERS'},
    ]
  }
];