getOutputAmount method

Implementation

List<dynamic> getOutputAmount(TokenAmount inputAmount) {
  invariant(involvesToken(inputAmount.token),
      ' involves token ${inputAmount.token}');

  if (reserve0.raw == BigInt.zero || reserve1.raw == BigInt.zero) {
    throw InsufficientReservesError();
  }
  var inputReserve = reserveOf(inputAmount.token);
  var outputToken = inputAmount.token == token0 ? token1 : token0;
  var outputReserve = reserveOf(outputToken);

  var inputAmountWithFee = inputAmount.raw * bi997;

  var outputAmount = TokenAmount(
    outputToken,
    (inputAmountWithFee * outputReserve.raw) ~/
        (inputReserve.raw * bi1000 + inputAmountWithFee),
  );

  if (outputAmount.raw == BigInt.zero) {
    throw InsufficientInputAmountError('output not zero');
  }
  return [
    outputAmount,
    Pair(inputReserve + inputAmount, outputReserve - outputAmount)
  ];
}