Migrate from Ionic 3 to Ionic 4. ERROR in ../node_modules/@angular/core/src/facade/async.js. Module not found

@anton_klochko wrote:

Hi all ! Has anyone faced with such ERROR ? I am trying to migrate from Ionic 3 to Ionic 4.

ERROR in …/node_modules/@angular/core/src/facade/async.js
Module not found: Error: Can’t resolve ‘rxjs/Observable’ in ‘D:\tmp\ionic2\node_
modules@angular\core\src\facade’
ERROR in …/node_modules/@angular/forms/src/facade/async.js
Module not found: Error: Can’t resolve ‘rxjs/Observable’ in ‘D:\tmp\ionic2\node_
modules@angular\forms\src\facade’
ERROR in …/node_modules/@angular/http/src/backends/jsonp_backend.js
Module not found: Error: Can’t resolve ‘rxjs/Observable’ in ‘D:\tmp\ionic2\node_
modules@angular\http\src\backends’
ERROR in …/node_modules/@angular/http/src/backends/xhr_backend.js
Module not found: Error: Can’t resolve ‘rxjs/Observable’ in ‘D:\tmp\ionic2\node_
modules@angular\http\src\backends’
ERROR in …/node_modules/@angular/core/src/facade/async.js
Module not found: Error: Can’t resolve ‘rxjs/Subject’ in ‘D:\tmp\ionic2\node_mod
ules@angular\core\src\facade’
ERROR in …/node_modules/@angular/forms/src/facade/async.js
Module not found: Error: Can’t resolve ‘rxjs/Subject’ in ‘D:\tmp\ionic2\node_mod
ules@angular\forms\src\facade’
ERROR in …/node_modules/@angular/forms/src/model.js
Module not found: Error: Can’t resolve ‘rxjs/observable/fromPromise’ in ‘D:\tmp
ionic2\node_modules@angular\forms\src’
ERROR in …/node_modules/@angular/forms/src/validators.js
Module not found: Error: Can’t resolve ‘rxjs/operator/toPromise’ in ‘D:\tmp\ioni
c2\node_modules@angular\forms\src’
ERROR in …/node_modules/@angular/core/src/util/lang.js
Module not found: Error: Can’t resolve ‘rxjs/symbol/observable’ in ‘D:\tmp\ionic
2\node_modules@angular\core\src\util’

WARNING in …/node_modules/@angular/core/src/linker/system_js_ng_module_factory_
loader.js
71:15-36 Critical dependency: the request of a dependency is an expression

WARNING in …/node_modules/@angular/core/src/linker/system_js_ng_module_factory_
loader.js
87:15-102 Critical dependency: the request of a dependency is an expression

WARNING in Circular dependency detected:
src\app\pages\ModelItemPage\ModelItemPage.ts -> src\app\pages\ModelSearchPage\Mo
delSearchPage.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts

WARNING in Circular dependency detected:
src\app\pages\ModelSearchPage\ModelSearchPage.ts -> src\app\pages\ModelItemPage
ModelItemPage.ts -> src\app\pages\ModelSearchPage\ModelSearchPage.ts

WARNING in Circular dependency detected:
src\app\pages\SubscriptionButtonsPage\SubscriptionButtonsPage.ts -> src\app\page
s\models\models.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts -> src\app\pa
ges\sn-result\sn-result.ts -> src\app\services\AppProvider.ts -> src\app\pages\a
ccount\account.ts -> src\app\pages\products\products.ts -> src\app\pages\Subscri
ptionButtonsPage\SubscriptionButtonsPage.ts

WARNING in Circular dependency detected:
src\app\pages\account\account.ts -> src\app\pages\products\products.ts -> src\ap
p\pages\SubscriptionButtonsPage\SubscriptionButtonsPage.ts -> src\app\pages\mode
ls\models.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts -> src\app\pages\sn
-result\sn-result.ts -> src\app\services\AppProvider.ts -> src\app\pages\account
\account.ts

WARNING in Circular dependency detected:
src\app\pages\deactivate-device\deactivate-device.ts -> src\app\pages\products\p
roducts.ts -> src\app\pages\SubscriptionButtonsPage\SubscriptionButtonsPage.ts -

src\app\pages\models\models.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts
-> src\app\pages\sn-result\sn-result.ts -> src\app\services\AppProvider.ts -> s
rc\app\pages\deactivate-device\deactivate-device.ts

WARNING in Circular dependency detected:
src\app\pages\empty-subscriptions\empty-subscriptions.ts -> src\app\pages\produc
ts\products.ts -> src\app\pages\SubscriptionButtonsPage\SubscriptionButtonsPage.
ts -> src\app\pages\models\models.ts -> src\app\pages\ModelItemPage\ModelItemPag
e.ts -> src\app\pages\sn-result\sn-result.ts -> src\app\services\AppProvider.ts
-> src\app\pages\account\account.ts -> src\app\pages\loginPage\loginPage.ts -> s
rc\app\pages\empty-subscriptions\empty-subscriptions.ts

WARNING in Circular dependency detected:
src\app\pages\greeting\greeting.ts -> src\app\pages\products\products.ts -> src
app\pages\SubscriptionButtonsPage\SubscriptionButtonsPage.ts -> src\app\pages\mo
dels\models.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts -> src\app\pages
sn-result\sn-result.ts -> src\app\services\AppProvider.ts -> src\app\pages\accou
nt\account.ts -> src\app\pages\loginPage\loginPage.ts -> src\app\pages\greeting
greeting.ts

WARNING in Circular dependency detected:
src\app\pages\loginPage\loginPage.ts -> src\app\pages\greeting\greeting.ts -> sr
c\app\pages\products\products.ts -> src\app\pages\SubscriptionButtonsPage\Subscr
iptionButtonsPage.ts -> src\app\pages\models\models.ts -> src\app\pages\ModelIte
mPage\ModelItemPage.ts -> src\app\pages\sn-result\sn-result.ts -> src\app\servic
es\AppProvider.ts -> src\app\pages\account\account.ts -> src\app\pages\loginPage
\loginPage.ts

WARNING in Circular dependency detected:
src\app\pages\models\models.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts -

src\app\pages\sn-result\sn-result.ts -> src\app\services\AppProvider.ts -> src
\app\pages\account\account.ts -> src\app\pages\products\products.ts -> src\app\p
ages\SubscriptionButtonsPage\SubscriptionButtonsPage.ts -> src\app\pages\models
models.ts

WARNING in Circular dependency detected:
src\app\pages\products\products.ts -> src\app\pages\SubscriptionButtonsPage\Subs
criptionButtonsPage.ts -> src\app\pages\models\models.ts -> src\app\pages\ModelI
temPage\ModelItemPage.ts -> src\app\pages\sn-result\sn-result.ts -> src\app\serv
ices\AppProvider.ts -> src\app\pages\account\account.ts -> src\app\pages\product
s\products.ts

WARNING in Circular dependency detected:
src\app\pages\sn-result\sn-result.ts -> src\app\services\AppProvider.ts -> src\a
pp\pages\account\account.ts -> src\app\pages\products\products.ts -> src\app\pag
es\SubscriptionButtonsPage\SubscriptionButtonsPage.ts -> src\app\pages\models\mo
dels.ts -> src\app\pages\ModelItemPage\ModelItemPage.ts -> src\app\pages\sn-resu
lt\sn-result.ts

WARNING in Circular dependency detected:
src\app\pages\update-information\update-information.ts -> src\app\pages\ModelIte
mPage\ModelItemPage.ts -> src\app\pages\sn-result\sn-result.ts -> src\app\servic
es\AppProvider.ts -> src\app\pages\account\account.ts -> src\app\pages\products
products.ts -> src\app\pages\SubscriptionButtonsPage\SubscriptionButtonsPage.ts
-> src\app\pages\models\models.ts -> src\app\pages\update-information\update-inf
ormation.ts

WARNING in Circular dependency detected:
src\app\services\AppProvider.ts -> src\app\pages\account\account.ts -> src\app\p
ages\products\products.ts -> src\app\pages\SubscriptionButtonsPage\SubscriptionB
uttonsPage.ts -> src\app\pages\models\models.ts -> src\app\pages\ModelItemPage\M
odelItemPage.ts -> src\app\pages\sn-result\sn-result.ts -> src\app\services\AppP
rovider.ts
[ERROR] An error occurred while running subprocess ng.

    ng run app:ionic-cordova-build --platform=android exited with exit code

    1.

    Re-running this command with the --verbose flag may provide more
    information.

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Participants: 1

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