@dahlia-labs/stableswap-sdk/dist/esm/calculator/price.js

SDK for Mobius's StableSwap program.

import { Price, TEN, TokenAmount } from "@dahlia-labs/token-utils";
import JSBI from "jsbi";
import { calculateEstimatedSwapOutputAmount } from "./";
function min(a, b) {
    return JSBI.greaterThanOrEqual(a, b) ? b : a;
}
function max(a, b) {
    return JSBI.greaterThanOrEqual(a, b) ? a : b;
}
/**
 * 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];
    const reserve1 = exchangeInfo.reserves[1];
    // We try to get at least 16 decimal points of precision here
    // Otherwise, we attempt to swap 1% of total supply of the pool
    // or at most, $1
    const inputAmountNum = max(JSBI.divide(JSBI.BigInt(10000000000000000), JSBI.exponentiate(TEN, JSBI.BigInt(18 - reserve0.token.decimals))), min(JSBI.exponentiate(TEN, JSBI.BigInt(reserve0.token.decimals)), reserve0.divide(100).quotient));
    const inputAmount = new TokenAmount(reserve0.token, inputAmountNum);
    const outputAmount = calculateEstimatedSwapOutputAmount(exchangeInfo, inputAmount);
    const frac = outputAmount.outputAmountBeforeFees.divide(inputAmount.asFraction);
    return new Price(reserve0.token, reserve1.token, frac.denominator, frac.numerator);
};
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