@moonwell-fi/moonwell-sdk/_esm/actions/morpho/utils/accrueInterests.js

TypeScript Interface for Moonwell

import { toSharesDown, wMulDown, wTaylorCompounded } from "./math.js";
export const accrueInterests = (lastBlockTimestamp, marketState, borrowRate) => {
    const elapsed = BigInt(lastBlockTimestamp) - BigInt(marketState.lastUpdate);
    // Early return if no time has elapsed since the last update
    if (elapsed === 0n || marketState.totalBorrowAssets === 0n) {
        return marketState;
    }
    // Calculate interest
    const interest = wMulDown(marketState.totalBorrowAssets, wTaylorCompounded(borrowRate, elapsed));
    // Prepare updated market state with new totals
    const marketWithNewTotal = {
        ...marketState,
        totalBorrowAssets: marketState.totalBorrowAssets + interest,
        totalSupplyAssets: marketState.totalSupplyAssets + interest,
    };
    // Early return if there's no fee
    if (marketWithNewTotal.fee === 0n) {
        return marketWithNewTotal;
    }
    // Calculate fee and feeShares if the fee is not zero
    const feeAmount = wMulDown(interest, marketWithNewTotal.fee);
    const feeShares = toSharesDown(feeAmount, BigInt(marketWithNewTotal.totalSupplyAssets) - feeAmount, BigInt(marketWithNewTotal.totalSupplyShares));
    // Return final market state including feeShares
    return {
        ...marketWithNewTotal,
        totalSupplyShares: BigInt(marketWithNewTotal.totalSupplyShares) + feeShares,
    };
};
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