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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.
                set first item of MENUITEMS to {     state: '/',     name: 'HOME',     type: 'link',     icon: 'explore', badge: [], children: []   }
– Hasan Fathi
                May 9, 2018 at 3:35
                The correct way to fix this is to give your MENUITEMS an appropriate type to help the TypeScript compiler out. const MENUITEMS: Menu[] = [...]
– Daniel W Strimpel
                May 9, 2018 at 3:44
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'},
        
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