@getclave/lifi-sdk
Version:
LI.FI Any-to-Any Cross-Chain-Swap SDK
28 lines (27 loc) • 1.22 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.checkStepSlippageThreshold = checkStepSlippageThreshold;
// Standard threshold for destination amount difference (0.5%)
const standardThreshold = 0.005;
/**
* Used to check if changed exchange rate is in the range of slippage threshold.
* We use a slippage value as a threshold to trigger the rate change hook.
* This can result in almost doubled slippage for the user and need to be revisited.
* @param oldStep - old step
* @param newStep - new step
* @returns Boolean
*/
function checkStepSlippageThreshold(oldStep, newStep) {
const setSlippage = oldStep.action.slippage || standardThreshold;
const oldEstimatedToAmount = BigInt(oldStep.estimate.toAmountMin);
const newEstimatedToAmount = BigInt(newStep.estimate.toAmountMin);
const amountDifference = oldEstimatedToAmount - newEstimatedToAmount;
// oldEstimatedToAmount can be 0 when we use contract calls
let actualSlippage = 0;
if (oldEstimatedToAmount > 0) {
actualSlippage =
Number((amountDifference * 1000000000n) / oldEstimatedToAmount) /
1_000_000_000;
}
return actualSlippage <= setSlippage;
}