Angular 9 (ivy) - ReferenceError: EmitterAction is not defined

[alexej-strelzow]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ x ] Bug report  
[ ] Performance issue
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => https://github.com/ngxs/store/blob/master/CONTRIBUTING.md
[ ] Other... Please describe:

Current behavior

import { EmitterAction, Receiver } from '@ngxs-labs/emitter';

@Receiver() public static setRegistered(ctx: StateContext<MasterStateModel>, action: EmitterAction<string>) {

the EmitterAction class cannot be found at runtime when compiled with Angular 9 -> ivy.

No bug at compile time.

Workaround:
@Receiver() public static setRegistered(ctx: StateContext<MasterStateModel>, action: any) {

any instead of EmitterAction

Expected behavior

Should work with type EmitterAction

Minimal reproduction of the problem with instructions

• install Angular 9 (ivy enabled by default)
• write an emitter
• write a receiver
• compile (with ivy)
• open browser
• error

What is the motivation / use case for changing the behavior?

Environment

Libs:
- @angular/core version: X.Y.Z
- @ngxs/store version: X.Y.Z

`  "dependencies": {
...
    "@angular/compiler": "~9.0.0",
    "@angular/core": "~9.0.0",
    "@clr/angular": "^3.0.0-next.7",
    "@clr/core": "^3.0.0-next.7",
    "@clr/ui": "^3.0.0-next.7",
    "@ngxs-labs/emitter": "~2.0.0",
    "@ngxs/storage-plugin": "~3.6.2",
    "@ngxs/store": "~3.6.2",
    "@webcomponents/custom-elements": "~1.3.2",
    "rxjs": "~6.5.4",
    "tslib": "^1.10.0",
    "zone.js": "~0.10.2"
  },`

Browser:
- [ x ] Chrome (desktop) version Version 79.0.3945.130 (Official Build) (64-bit)
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[splincode]

please create github repo for reproduce

[alexej-strelzow]

@splincode this occurs when I inject a service into the state, actually it is enough to add the @Injectable() decorator - necessary when services get injected (see migration guide of NGXS). So without the decorator + constructor it works.

@State<MasterStateModel>({
  name: 'master',
  defaults: {
    apps: []
  }
})
@Injectable()
export class MasterState {
  constructor(@Inject(LOGGING_SERVICE) private _logger: LoggingInterface) {
    
  }
}

[alexej-strelzow]

@splincode you also MUST have the following 2 flags in angular.json:

            "optimization": true,
            "aot": true

I think that EmitterAction gets tree-shaken away.