How to use currency pipe in Angular ReactiveForm Input
1 Import CurrencyPipe
2 Subscribe to valueChanges event of your FormGroup (or even better, subscribe to valueChanges event of your specific form control, i.e. that specific input field for currency value)
3 Whenever valueChanges, convert string to a valid number format (in my example, I remove all leading 0's and non-digit characters)
4 Convert number to currency format using CurrencyPipe
5 Remember to disable emitEvent, or your code will enter infinite loop.