ERROR in changeDetection must be a member of ChangeDetectionStrategy enum from @angular/core

Bug Report

Ionic version: “@ionic/angular”: “^4.4.2” node 12.3.1

Current behavior: When activating ivy compiler ionic fails to compile with the following message:

ERROR in changeDetection must be a member of ChangeDetectionStrategy enum from @angular/core

Expected behavior: Doesn’t fail to compile

Steps to reproduce:

ionic start ionic-angular-ivy blank --type=angular

add this to your tsconfig.json

  "angularCompilerOptions": {
    "enableIvy": true
  }

then call

ng update @angular/cli @angular/core --force

finally build the empty project

ng build

Related code:

Here’s a github link to a sample project ready to fail:

https://github.com/plchampigny/ionic-angular-ivy

Other information:

I do think the problem comes from this file:

https://github.com/ionic-team/ionic/blob/9030dcc111cc6486d22b45852a9906d18fa51f0c/angular/src/directives/proxies.ts since it’s one of the only usage from changeDetection within ionic and you aren’t using the values from the ChangeDetectionStrategy enum.

Ionic info:

Ionic:

   ionic (Ionic CLI)             : 4.12.0 (C:\Users\Cactus\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework               : @ionic/angular 4.4.2
   @angular-devkit/build-angular : 0.800.0
   @angular-devkit/schematics    : 7.3.9
   @angular/cli                  : 8.0.0
   @ionic/angular-toolkit        : 1.5.1

System:

   NodeJS : v12.3.1 (C:\Program Files\nodejs\node.exe)
   npm    : 6.4.1
   OS     : Windows 10

[plchampigny]

Added a PR to backport this fix on the branch 0.18.x used by the current version of @ionic/core: https://github.com/ionic-team/stencil/pull/1578

[plchampigny]

After digging more, I think the problem come from stencil code generation. I’ll create a PR on their side and link it here