Getting error "e.isDef is not a function" when integrating ol-cesium

[Dji75]

Hello,

I'm trying to integrate ol-cesium with ngx-openlayers to my project and I encounter an unexpected error when calling setEnabled from OLcesium :

TypeError: e.isDef is not a function
    at e.t.throwOnUnitializedMap_ (olcesium.umd.js:1)
    at e.t.setEnabled (olcesium.umd.js:1)
    at AppComponent.push../src/app/app.component.ts.AppComponent.init3dGlobe (app.component.ts:65)
    at AppComponent.push../src/app/app.component.ts.AppComponent.switch3DMode (app.component.ts:54)
    at Object.eval [as handleEvent] (AppComponent.html:1)
    at handleEvent (core.js:23106)
    at callWithDebugContext (core.js:24176)
    at Object.debugHandleEvent [as handleEvent] (core.js:23903)
    at dispatchEvent (core.js:20555)
    at core.js:21002

Here is my versions

ngx-openlayers: 1.0.0-next.6
ol: 6.0.0-beta.3
ol-cesium: 2.8.0

ngx-openlayers uses openlayers 4.4.2 but ol-cesium 2.8.0 uses ol 6.0.0-beta.3 ("ol", not old named "openlayers")
I can't find right version of ngx-openlayers to deal correctly with quite recent ol-cesium.

Here is the minimal project which reproduce the error: https://github.com/Dji75/temp-ol-cesium

I'm stuck for days, thanks to help me or give me advice I can follow to find my way :)
Thanks

[Yakoust]

Maybe this will be fixed by OL5 intergartion in #183

[Dji75]

Yes you're right, it fix it ! (but I have now other issues but not related to ol-cesium)