/**
 * Reconstructs a nested object from a flat object with dot-notation keys.
 *
 * @param obj - The flat object with dot-notation keys.
 * @returns A nested object structure representing the original hierarchy.
 *
 * @example
 * // Basic dot notation
 * unflattenObject({ 'a.b.c': 1, 'a.b.d': 2, 'e': 3 });
 * // { a: { b: { c: 1, d: 2 } }, e: 3 }
 *
 * @example
 * // With nested paths
 * unflattenObject({ 'user.profile.name': 'John', 'user.profile.age': 30, 'user.active': true });
 * // { user: { profile: { name: 'John', age: 30 }, active: true } }
 *
 * @example
 * // Array indices in square brackets
 * unflattenObject({ 'items[0]': 'A', 'items[1]': 'B', 'items[2]': 'C' });
 * // { items: ['A', 'B', 'C'] }
 *
 * @example
 * // Mixed arrays and objects
 * unflattenObject({ 'users[0].name': 'Alice', 'users[1].name': 'Bob', 'count': 2 });
 * // { users: [{ name: 'Alice' }, { name: 'Bob' }], count: 2 }
 *
 * @example
 * // Real-world: Parse flattened database query result
 * const flatResult = {
 *   'order.id': 123,
 *   'order.customer.name': 'John Doe',
 *   'order.items[0].product': 'Laptop',
 *   'order.items[0].quantity': 1
 * };
 * unflattenObject(flatResult);
 * // {
 * //   order: {
 * //     id: 123,
 * //     customer: { name: 'John Doe' },
 * //     items: [{ product: 'Laptop', quantity: 1 }]
 * //   }
 * // }
 *
 * @note Only handles simple dot notation and supports array indices in square brackets.
 * @note If properties conflict during reconstruction, the last one processed will override previous values.
 * @note Doesn't handle escaped dots in property names.
 * @note Similar to fromDotNotation but simpler implementation.
 * @note Useful for expanding query results and configuration data.
 *
 * @complexity Time: O(n * d), Space: O(n) - Where n is keys, d is average depth
 */
export declare function unflattenObject(obj: Record<string, unknown>): Record<string, unknown>;
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