bug: Problem with Angular 9 + Ionic 5

Bug Report

Ionic version: [x] 5.x

Current behavior: When run ionic serve the app doesn’t work

Steps to reproduce:

I try upgrade with follow steps:

• ng update @angular/cli@8 @angular/core@8
• npm install @ionic/angular@latest @ionic/angular-toolkit@latest --save
• ng update @angular/cli @angular/core`

Ionic info:

   Ionic CLI                     : 6.1.0 (/usr/local/lib/node_modules/@ionic/cli)
   Ionic Framework               : @ionic/angular 5.0.0
   @angular-devkit/build-angular : 0.900.1
   @angular-devkit/schematics    : 9.0.1
   @angular/cli                  : 9.0.1
   @ionic/angular-toolkit        : 2.1.2

Ng version

@angular-devkit/architect         0.801.2
@angular-devkit/build-angular     0.900.1
@angular-devkit/build-optimizer   0.900.1
@angular-devkit/build-webpack     0.900.1
@angular-devkit/core              9.0.1
@angular-devkit/schematics        9.0.1
@angular/cli                      9.0.1
@ngtools/webpack                  9.0.1
@schematics/angular               8.3.25
@schematics/update                0.900.1
rxjs                              6.5.4
typescript                        3.7.5
webpack                           4.41.2

my tsconfig.app.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./out-tsc/app",
    "types": []
  },
  "include": [
    "src/**/*.ts"
  ],
  "exclude": [
    "src/test.ts",
    "src/**/*.spec.ts"
  ]
}

[liamdebeasi]

You can upgrade an app to Angular 9 by running ng update @angular/core @angular/cli.

The starter apps currently ship with Angular 8 and will be updated to ship with Angular 9 by default soon.

[ionitron-bot[bot]]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.