@saberhq/stableswap-sdk/dist/esm/calculator/price.js

Solana SDK for Saber's StableSwap program.

import { Price, TokenAmount } from "@saberhq/token-utils";
import BN from "bn.js";
import { calculateEstimatedSwapOutputAmount } from "../index.js";
/**
 * Gets the price of the second token in the swap, i.e. "Token 1", with respect to "Token 0".
 *
 * To get the price of "Token 0", use `.invert()` on the result of this function.
 * @returns
 */
export const calculateSwapPrice = (exchangeInfo) => {
    const reserve0 = exchangeInfo.reserves[0].amount;
    const reserve1 = exchangeInfo.reserves[1].amount;
    // We try to get at least 4 decimal points of precision here
    // Otherwise, we attempt to swap 1% of total supply of the pool
    // or at most, $1
    const inputAmountNum = Math.max(10_000, Math.min(10 ** reserve0.token.decimals, Math.floor(parseInt(reserve0.toU64().div(new BN(100)).toString()))));
    const inputAmount = new TokenAmount(reserve0.token, inputAmountNum);
    const outputAmount = calculateEstimatedSwapOutputAmount(exchangeInfo, inputAmount);
    const frac = outputAmount.outputAmountBeforeFees.asFraction.divide(inputAmount.asFraction);
    return new Price(reserve0.token, reserve1.token, frac.denominator, frac.numerator);
};
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