[SOLVED] Class constructor UpgradeComponent cannot be invoked without 'new' after Update to Angular 10

Class constructor UpgradeComponent cannot be invoked without 'new' after Update to Angular 10

I just started to upgrade an Angular project from 9.1.0 to 10.0.12 It is still a hybrid app and has couple of components upgraded (from Angular JS) as described in the Angular docs

However after the Update to Angular 10 those upgraded components would not load and result in the following error

Class constructor UpgradeComponent cannot be invoked without 'new' (at new MyUpgradedComponentDirective)

I searched the Changelog and didn't found any information regarding UpgradeComponent.

Solution

After endless search without results I went to trial & error mode.
I discovered that there is a jit property on the @Directive, if set to true the mentioned error goes away.

With adding jit: true the upgraded component code looks something like this

@Directive({
    selector: 'my-angular-selector',
    jit: true,
})
export class MyDirective extends UpgradeComponent {
    constructor(elementRef: ElementRef, injector: Injector) {
        super('angularJsDirectiveSelector', elementRef, injector);
    }
}