fix(plugins): fix rxjs 6 build errors

#2439

src/@ionic-native/plugins/geolocation/index.ts

@@ -1,11 +1,10 @@
 import { Injectable } from '@angular/core';
 import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
-import { Observable } from 'rxjs/Observable';
+import { Observable } from 'rxjs';
 
 declare const navigator: any;
 
 export interface Coordinates {
-
   /**
    * a double representing the position's latitude in decimal degrees.
    */
@@ -49,7 +48,6 @@ export interface Coordinates {
    * This value can be null.
    */
   speed: number;
-
 }
 
 export interface Geoposition {
@@ -65,7 +63,6 @@ export interface Geoposition {
 }
 
 export interface PositionError {
-
   /**
    * A code that indicates the error that occurred
    */
@@ -75,11 +72,9 @@ export interface PositionError {
    * A message that can describe the error that occurred
    */
   message: string;
-
 }
 
 export interface GeolocationOptions {
-
   /**
    * Is a positive long value indicating the maximum age in milliseconds of a
    * possible cached position that is acceptable to return. If set to 0, it
@@ -107,7 +102,6 @@ export interface GeolocationOptions {
    * @type {boolean}
    */
   enableHighAccuracy?: boolean;
-
 }
 
 /**
@@ -161,13 +155,13 @@ export interface GeolocationOptions {
   plugin: 'cordova-plugin-geolocation',
   pluginRef: 'navigator.geolocation',
   repo: 'https://github.com/apache/cordova-plugin-geolocation',
-  install: 'ionic cordova plugin add cordova-plugin-geolocation --variable GEOLOCATION_USAGE_DESCRIPTION="To locate you"',
+  install:
+    'ionic cordova plugin add cordova-plugin-geolocation --variable GEOLOCATION_USAGE_DESCRIPTION="To locate you"',
   installVariables: ['GEOLOCATION_USAGE_DESCRIPTION'],
   platforms: ['Amazon Fire OS', 'Android', 'Browser', 'iOS', 'Windows']
 })
 @Injectable()
 export class Geolocation extends IonicNativePlugin {
-
   /**
    * Get the device's current position.
    *
@@ -200,12 +194,13 @@ export class Geolocation extends IonicNativePlugin {
    * @returns {Observable<Geoposition>} Returns an Observable that notifies with the [position](https://developer.mozilla.org/en-US/docs/Web/API/Position) of the device, or errors.
    */
   watchPosition(options?: GeolocationOptions): Observable<Geoposition> {
-    return new Observable<Geoposition>(
-      (observer: any) => {
-        const watchId = navigator.geolocation.watchPosition(observer.next.bind(observer), observer.next.bind(observer), options);
-        return () => navigator.geolocation.clearWatch(watchId);
-      }
-    );
+    return new Observable<Geoposition>((observer: any) => {
+      const watchId = navigator.geolocation.watchPosition(
+        observer.next.bind(observer),
+        observer.next.bind(observer),
+        options
+      );
+      return () => navigator.geolocation.clearWatch(watchId);
+    });
   }
-
 }