How to use

subtract

function

in

js

private async revertThePreviousCreditTransaction(
  manager: EntityManager,
  previousCreditTransaction: CreditTransactions,
  currentDebt: number,
  userId: string
 ): Promise<number> {
  const ct = new CreditTransactions();
  ct.customerId = previousCreditTransaction.customerId;
  ct.amountPaid = currency(previousCreditTransaction.billAmount).subtract(
   previousCreditTransaction.amountPaid
  ).value;
  ct.balance = 0;
  ct.totalDebt = currency(currentDebt).subtract(ct.amountPaid).value;
  ct.createdBy = userId;
  ct.updatedBy = userId;
  ct.isReverted = true;
  ct.type = CreditTransactionsType.SaleRevertPayment;
  ct.paidDate = new Date();

  await manager.save(CreditTransactions, ct);

  return ct.totalDebt;
 }

.subtract(saleDetails.totalDiscount).value;

currency(product.sellingPrice)
 .multiply(cartItem.qty)
 .subtract(cartItem.discount).value === cartItem.price;

);
const currentBalance = currency(billAmount).subtract(amountPaid).value;

current.transactionId = previousTransaction.transactionId;
current.totalDebt = currency(pointer.balanceAmount)
 .subtract(currency(previousTransaction.billAmount))
 .add(amountPaid).value;
current.isReverted = false;

private async revertThePreviousCreditTransaction(
  manager: EntityManager,
  previousCreditTransaction: CreditTransactions,
  currentDebt: number,
  userId: string
 ): Promise<number> {
  const ct = new CreditTransactions();
  ct.customerId = previousCreditTransaction.customerId;
  ct.amountPaid = currency(previousCreditTransaction.billAmount).subtract(
   previousCreditTransaction.amountPaid
  ).value;
  ct.balance = 0;
  ct.totalDebt = currency(currentDebt).subtract(ct.amountPaid).value;
  ct.createdBy = userId;
  ct.updatedBy = userId;
  ct.isReverted = true;
  ct.type = CreditTransactionsType.SaleRevertPayment;
  ct.paidDate = new Date();

  await manager.save(CreditTransactions, ct);

  return ct.totalDebt;
 }

currency(product.sellingPrice)
 .multiply(cartItem.qty)
 .subtract(cartItem.discount).value === cartItem.price;

.subtract(saleDetails.totalDiscount).value;

);
const currentBalance = currency(billAmount).subtract(amountPaid).value;

current.transactionId = previousTransaction.transactionId;
current.totalDebt = currency(pointer.balanceAmount)
 .subtract(currency(previousTransaction.billAmount))
 .add(amountPaid).value;
current.isReverted = false;