/**
 * Transforms a BigInt to a string (action).
 *
 * @param this - The object containing the property to transform
 * @param propName - The name of the property to transform
 * @returns A function that sets the BigInt argument into the string property
 */
export declare function bigIntToStringTransform<T extends {
    [k in K]?: string | null | undefined;
}, K extends keyof T>(propName: K): (this: T, bigint: bigint | Extract<T[K], undefined | null>) => void;