/**
 * Safely resolves nested keys from a dot-separated string like "user.city".
 *
 * @param obj - The source object
 * @param path - The nested path string (e.g. "user.city")
 * @returns The resolved value or `undefined`
 */
export declare function _resolveNestedKey(obj: unknown, path: string): unknown;
/**
 * Retrieves a numeric value from a nested property in dot notation.
 * Falls back to 0 if value is not a number or numeric string.
 *
 * @param obj - The source object to read from.
 * @param path - The path string like 'user.income.tax'.
 * @returns The numeric value at that path, or 0 if not valid.
 */
export declare function _getNumericProp(obj: unknown, path: string): number;
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