/**
 * Sets a value at a deeply nested path on an object, mutating it.
 * Creates intermediate objects as needed.
 *
 * @template T - Type of the source object
 * @param {T} object - Target object (mutated)
 * @param {string | string[]} path - Dot-separated string or path segments array
 * @param {unknown} value - Value to assign at the path
 * @returns {T} The same object reference, for chaining
 *
 * @remarks
 * **Prototype pollution warning:** This function does not filter out
 * prototype-polluting keys (`__proto__`, `constructor`, `prototype`).
 * Sanitize user-controlled paths before calling.
 *
 * @example
 * set({}, "a.b.c", 1); // { a: { b: { c: 1 } } }
 */
export declare const set: <T extends object>(object: T, path: string | string[], value: unknown) => T;