ng build --prod facing many build issues in ionic app while running web ionic app parallely

**Description:**
After running the build command - ng build --prod in the application, getting several issues.which are are not displayed while running the app locally

1/ Importing component more than one module.
2/ Property does not exist
3/ ion-col is not an element

**Steps to Reproduce:**

While running command ng build --prod

**Output:**

**My `ionic info`:**

```
1/ Error: mobile/src/app/modules/features/home/home.page.html:27:5 - error NG8001: 'ion-row' is not a known element:
1. If 'ion-row' is an Angular component, then verify that it is part of this module.
2. If 'ion-row' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

2/ Error: - error TS2339: Property 'value' does not exist on type 'EventTarget'.
(ionChange)="onValueChanged($event.target.value)"
```

**Other Information:**