ngx-drag-drop | Angular directives using the native HTML Drag And Drop API | Frontend Framework library

I am trying to use the persistent build cache feature provided by angular but look like its not working for me, I am trying the below command

I have a pre-developed angular project, i just ran npm i to install its packages locally, then ng serve to run the project, the project works well without problems but..

when i wanted to create a new component with ng g c new-component i got this error:

I followed this guide to set up swiper slider in my Angular 8 application.

I get the below error when importing NgxUsefulSwiperModule into app.module.ts

ERROR in ./node_modules/ngx-useful-swiper/fesm2015/ngx-useful-swiper.js Module not found: Error: Can't resolve 'swiper/bundle' in 'C:\Users\Dan\NewAngular\node_modules\ngx-useful-swiper\fesm2015'

I tried deleting the node_modules folder and reinstalling everything but it fails every time.

Can someone please tell me what I'm doing wrong?

This is my package.json file

Here's the package.json file:

I'm using the latest versions of all Angular-related packages (so Angular 10).

I want to add some code to a component, but I only want this code to exist in dev, never in a production build. It needs to be completely stripped in prod builds. I found this comment, which indicates that environments do this automatically (because they're const).

I tried using that exact code in my app, but the dev code is still there in a production build. I copied the code over to a new test app that I made with ng new, and it does work properly there.

What things should I be looking for, how can I fix this? Is this possibly because I have CommonJS dependencies, and if so, can I do anything about that (since I can't remove those dependencies)?

Some notes:

• An issue has been opened on the angular-cli repo here.
• The environment object is never written to anywhere in the codebase, I've searched thoroughly. (It's only used in a few places anyway.)
• Code bounded with if (false) { } is properly stripped.
• Removing the services export from the end of environment{.prod}.ts does not fix the problem.
• Removing all CommonJS dependencies does not fix the problem.

Here's environment.prod.ts (environment.ts is the same, just with false instead of true):

I am facing an issue, when trying to make production build with ng build --prod while ng build and ng serve running fine...

Yesterday I upgraded my project to Angular v9. I'm getting the below error when running ng build.

Generating ES5 bundles for differential loading... An unhandled exception occurred: C:\workspace\project\ui\pages-pages-module-es2015.js: Property left of ForInStatement expected node to be of a type ["VariableDeclaration","LVal"] but instead got null See "C:\Users\sayoo\AppData\Local\Temp\ng-BaceZi\angular-errors.log" for further details.

Please find below the files : package.json