/**
 * Converts a human-readable decimal amount string to the smallest unit
 * representation as a bigint, using string-based arithmetic to avoid
 * floating-point precision loss.
 *
 * @param amount - The amount as a decimal string (e.g. "1.5").
 * @param decimals - The number of decimal places for the token.
 * @returns The amount in smallest units as a bigint.
 */
export declare const parseAmountToSmallestUnit: ({ amount, decimals, }: {
    amount: string;
    decimals: number;
}) => bigint;