/**
 * Take an object with keys of type `address.street`, `address.city` and
 * convert it to an object with nested objects like `{ address: { street: ..., city: ... } }`
 *
 * Keys here are the header row of an uploaded file. A `__proto__` segment is
 * skipped rather than written, and every step descends only into objects this
 * function created (or the file supplied), never into an inherited value, so
 * `constructor.prototype.x` is just three nested names.
 * @param flatObj
 */
export declare function unflattenObject(flatObj: {
    [key: string]: any;
}): {
    [key: string]: any;
};
/**
 * Parse each cell that holds JSON (`"true"`, `"40"`, `"[1,2]"`) into its value;
 * anything else is kept as it is.
 */
export declare function mapJsonParse(obj: Record<string, any>): Record<string, any>;