Update deps

src/@ionic-native/core/decorators/common.ts

@@ -1,5 +1,5 @@
-import * as _ from 'lodash';
-import { fromEvent, Observable } from 'rxjs';
+import { isUndefined } from 'lodash';
+import { Observable, fromEvent } from 'rxjs';
 
 import { CordovaOptions } from './interfaces';
 
@@ -525,7 +525,7 @@ export function wrapInstance(
             reject
           );
         }
-        if (result && !_.isUndefined(result.then)) {
+        if (result && !isUndefined(result.then)) {
           result.then(resolve, reject);
         } else {
           reject();

src/@ionic-native/core/decorators/cordova-function-override.ts

@@ -1,8 +1,8 @@
-import { Observable } from 'rxjs';
+import { Observable, Observer } from 'rxjs';
 import { checkAvailability, getPlugin } from './common';
 
 function overrideFunction(pluginObj: any, methodName: string): Observable<any> {
-  return new Observable(observer => {
+  return new Observable((observer: Observer<any>) => {
     const availabilityCheck = checkAvailability(pluginObj, methodName);
 
     if (availabilityCheck === true) {