BUG: IVY ViewChild does not work when defined in base class

[kukjevov]

🐞 bug report

Affected Package

@angular/core

Is this a regression?

Definitely yes, it is working without IVY.

Description

When you define ViewChild (probably same with ViewChildren, maybe even with ContentChild) in parent base class, this property will never be set by Angular.

🔬 Minimal Reproduction

git clone https://github.com/kukjevov/ng-universal-demo.git
cd ng-universal-demo
git checkout ivy-error
npm install
npm start
open browser on http://localhost:8888/garden
you should see undefined in console instead of requested instance of component

🔥 Exception or Error

No error just missing value of property with ViewChild

🌍 Your Environment

Angular Version:
Angular 9-next.12

Anything else relevant?
Windows: 10.0.17763
Node: 11.6.0
NPM: 6.9.0

[dannyskoog]

Do you have decorator (e.g. @Directive()) on the base class?

[kukjevov]

No i dont have Directive decorator since it is not directive, but i have Injectable decorator. You might take a look at the repo :).

https://github.com/kukjevov/ng-universal-demo/blob/ivy-error/app/pages/garden/base.ts
https://github.com/kukjevov/ng-universal-demo/blob/ivy-error/app/pages/garden/baseOfBase.ts
https://github.com/kukjevov/ng-universal-demo/blob/ivy-error/app/pages/garden/garden.component.ts

[alexzuza]

Related thread #30080 (comment)

[dannyskoog]

@kukjevov the reason why I brought up @Directive is due to this https://next.angular.io/guide/migration-undecorated-classes

[kukjevov]

Oh thx @dannyskoog i tried it and it is working :). But still if it is final state, this is breaking change that should be mentioned, but as workaround it is working :).

[alxhub]

@kukjevov glad to hear it's working for you. There are a set of code migrations for Ivy which are required - you can see that in the next.angular.io link posted above. The CLI applies these migrations automatically when updating to v9.

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