Not compatible with Ivy (experimental)

Issue description When compiling with Ivy, the compilation fails with the following error:

ERROR in src/app/app.module.ts(8,12): error TS-991010: Value at position 1 in the NgModule.importss of AppModule is not a reference: [object Object]

Steps to reproduce and a minimal demo of the problem I could not create a stackblitz or plunker for this as it is intending to show a compiler failure and I do not know how to demonstrate this. You can check out https://github.com/paullessing/agm-ivy-demo and attempt to build after running yarn install.

1. Install new project of Angular 8 using ng new
2. Add @agm/core and set up the default import

   imports: [
     BrowserModule,
     AgmCoreModule.forRoot({
       apiKey: environment.mapsApiKey,
     })
   ]
   

3. Enable Ivy in tsconfig.app.json:

   {
     ...
     "angularCompilerOptions": {
        "enableIvy": true
     }
   }
   

4. Enable AOT in angular.json to work around “lazy routes not found”:

   {
     "projects": {
       "my-project": {
         "architect": {
           "build": {
             "options": {
               ...
               "aot": true,
             }
           }
         }
       }
     }
   }
   

5. Run ng serve

Current behavior Compile fails with error:

ERROR in src/app/app.module.ts(8,12): error TS-991010: Value at position 1 in the NgModule.importss of AppModule is not a reference: [object Object]

(Position 1 in the imports array is the AgmCoreModule.forRoot())

Expected/desired behavior No compiler failures

angular2 & angular-google-maps version

"@agm/core": "1.0.0-beta.5",

Angular CLI: 8.0.1
Node: 10.16.0
OS: win32 x64
Angular: 8.0.0
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.800.1
@angular-devkit/build-angular     0.800.1
@angular-devkit/build-optimizer   0.800.1
@angular-devkit/build-webpack     0.800.1
@angular-devkit/core              8.0.1
@angular-devkit/schematics        8.0.1
@angular/cli                      8.0.1
@ngtools/webpack                  8.0.1
@schematics/angular               8.0.1
@schematics/update                0.800.1
rxjs                              6.4.0
typescript                        3.4.5
webpack                           4.30.0

Other information Compile works when Ivy is disabled.

May be related to https://github.com/angular/angular/issues/28603 which states that if the package.json does not contain a types or typings property, the module will be excluded from compilation.

[pshurygin]

I agree that this must be released ASAP. This library’s incompatibility with ivy is one of few issues left preventing us from testing ivy on our mid-scale web app.

[mruknowme]

Any updates on this issue?