/**
 * Sets the value at path of object. Creates intermediate objects as needed.
 * Returns a new object (immutable).
 *
 * @param obj - The object to modify
 * @param path - The path of the property to set (string with dots or array)
 * @param value - The value to set
 * @returns New object with the value set
 *
 * @example
 * setFast({ a: { b: 1 } }, 'a.c', 2) // { a: { b: 1, c: 2 } }
 * setFast({}, 'a.b.c', 1) // { a: { b: { c: 1 } } }
 */
export declare function setFast<T extends object>(obj: T, path: string | readonly (string | number)[], value: unknown): T;
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