Founded the efficient way to use the default currency pipe provided by the angular to format the currecncy while user is typing the value inside the input.

I had used the Indian currency (INR) in the code. You just need to change currency as per the requirement and also need to update the currency symbol inside the conditions.

For Example we will use for USD:

change INR to USD

   this.formattedAmount = this.currencyPipe.transform(this.value, 'USD', true, '1.0-0');     

also need to update "₹" sign with the currency symbol in our case replace with "$"

  if (element.target.value.indexOf('$') !== -1) {
          this.formattedAmount = this.formattedAmount.replace(/[$,]/g, "")