@shogun-sdk/money-legos/dist/esm/utils/slippage.js

Shogun Money Legos: clients and types for quotes, memes, prices, balances, fees, validations, etc.

export const SLIPPAGE_ERROR_OUTPUT_MSG = 'Could not calculate optimal slippage';
export const getSuggestedSlippage = (quote, errorData) => {
    // Extract the actual amount from the error data (0x + 64 characters after the error code)
    const index = errorData
        .slice(10) // Skip error code (0xff5f293c)
        .split('')
        .findIndex((char) => char !== '0'); // Find first non-zero character
    const actualAmountHex = errorData.slice(10 + (index === -1 ? 0 : index)); // Return everything after zeros
    if (!actualAmountHex) {
        throw Error(SLIPPAGE_ERROR_OUTPUT_MSG);
    }
    try {
        const actualAmount = BigInt(`0x${actualAmountHex}`);
        const expectedAmount = BigInt(quote.routes[0]?.amountOut?.value ?? '0');
        if (actualAmount >= expectedAmount) {
            throw new Error(SLIPPAGE_ERROR_OUTPUT_MSG);
        }
        // Calculate the perfect slippage percentage with 2 decimal precision
        const perfectSlippage = Number((BigInt('10000') * (expectedAmount - actualAmount)) / expectedAmount) / 100;
        // Add 0.5% safety margin and round to 2 decimals
        const suggestedSlippage = Math.ceil((perfectSlippage + 0.5) * 100) / 100;
        // Return minimum 0.5% slippage
        return Math.min(Math.max(suggestedSlippage, 0.5), 100);
    }
    catch (error) {
        console.error('Error parsing slippage error data:', error);
        throw new Error(SLIPPAGE_ERROR_OUTPUT_MSG);
    }
};
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