Angularを13にアップグレードすると

Angularを11系から13系にアップグレードしました。
するとsrc/app/app-routing.module.tsでこんなエラーが大量に・・・

Type 'string' is not assignable to type 'LoadChildrenCallback'.ts(2322) router.d.ts(1998, 5): The expected type comes from property 'loadChildren' which is declared here on type 'Route'

 Error: src/app/app-routing.module.ts:9:5 - error TS2322: Type 'string' is not assignable to type 'LoadChildrenCallback'.
[ng] 9     loadChildren: './home/home.module#HomePageModule',
[ng]       ~~~~~~~~~~~~
[ng]   node_modules/@angular/router/router.d.ts:1998:5
[ng]     1998     loadChildren?: LoadChildren;
[ng]              ~~~~~~~~~~~~
[ng]     The expected type comes from property 'loadChildren' which is declared here on type 'Route'
[ng] Error: src/app/app-routing.module.ts:14:5 - error TS2322: Type 'string' is not assignable to type 'LoadChildrenCallback'.
[ng] 14     loadChildren: './my-page/my-page.module#MyPagePageModule',
[ng]        ~~~~~~~~~~~~
[ng]   node_modules/@angular/router/router.d.ts:1998:5
[ng]     1998     loadChildren?: LoadChildren;
[ng]              ~~~~~~~~~~~~
[ng]     The expected type comes from property 'loadChildren' which is declared here on type 'Route'
[ng] Error: src/app/app-routing.module.ts:16:18 - error TS2322: Type 'string' is not assignable to type 'LoadChildrenCallback'.
[ng] 16   { path: 'day', loadChildren: './day/day.module#DayPageModule' },
[ng]                     ~~~~~~~~~~~~
[ng]   node_modules/@angular/router/router.d.ts:1998:5
[ng]     1998     loadChildren?: LoadChildren;
[ng]              ~~~~~~~~~~~~
[ng]     The expected type comes from property 'loadChildren' which is declared here on type 'Route'
[ng] Error: src/app/app-routing.module.ts:17:22 - error TS2322: Type 'string' is not assignable to type 'LoadChildrenCallback'.

dynamic importの書き方が変わったようです！

app-routing.module.ts

// 古いバージョン
  {
    path: 'my-page/:id',
    loadChildren: './my-page/my-page.module#MyPagePageModule',
  },

// 新しいバージョン
 {
    path: 'my-page/:id',
    loadChildren: () => import('./my-page/my-page.module').then(m => m.MyPagePageModule),
  },

また、tsconfig.jsonも"module": "esnext"になっているか要確認！

{
...
"compilerOptions": {
    ...
    "module": "esnext"
    ...
    }
}

参考