Requesting help to understand & how to initiate a typescript array of a class

I broke it down to these two items MapComponent and a GeoPoint class. What am I missing here?

MapComponent

• Are either of these the proper way to create an array of a class I've made so it is not undefined?
• If not what is the correct way?

    // Initiate
    const response: Array<LatLngExpression> = []; // Seems to work
    const response: [LatLngExpression] = [];      // Msg: Type any[] is not assignable to type [any]
    // Add a value to the array
    response.push(geoPoint.getLatLng());

GeoPoint

export clas GeoPoint {
  private _id: string;
  private _value: LatLngExpression; // This is a leaflet.LatLngExpression
  private _selected: boolean = false;

  constructor (id: string, latLng:LatLngExpression, selected?:boolean) {
    this._id = id;
    this._value = latLng;
    if(selected){
      this._selected = selected;
    }
  }

  set()... // you get the idea
  get()... // you get the idea
}