Ngx-translate error on --prod build after migration to ionic 4

@angelarg wrote:

Hi!

I had been using ngx-translate with my ionic3 app without problem. Now I have migrated the whole app to ionic 4, and it seemed to be working just fine, until I noticed that when running the build with --prod flag, it throws out the following error:

ionic cordova build android --prod

ERROR in Illegal State: referring to a type without a variable {"filePath":"C:/Users/HMG21_Carina/PGXperts-MobileInteraktionsCheck/node_modules/@ngx-translate/core/ngx-translate-core.d.ts","name":"TranslatePipe","members":[]}
[ERROR] An error occurred while running subprocess ng.

Ionic:

Ionic CLI : 5.2.7
Ionic Framework : @ionic/angular 4.9.0
@angular-devkit/build-angular : 0.801.3
@angular-devkit/schematics : 8.1.3
@angular/cli : 8.1.3
@ionic/angular-toolkit : 2.0.0

Cordova:

Cordova CLI : 9.0.0 (cordova-lib@9.0.1)
Cordova Platforms : android 8.1.0
Cordova Plugins : not available

Utility:

cordova-res : 0.8.0
native-run : 0.2.8

System:

Android SDK Tools : 26.1.1
NodeJS : v10.15.3
npm : 6.11.3
OS : Windows 10

I’m not sure what it means, so I don’t know where to start looking or what part of the code to copy here.
Any ideas? (Besides skipping the --prod flag, because I would really like to be able to use it.)

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