/**
 * Transforms an object or array type to make it deeply immutable.
 */
type DeepFrozen<T> = T extends Record<string | symbol, any> | any[] ? {
    readonly [P in keyof T]: DeepFrozen<T[P]>;
} : T;
/**
 * Freezes an object or array deeply.
 * The given obj is frozen deeply, no changes can be made after that on the obj nor its children after that.
 *
 * @param obj Object to freeze. Should be an object or an array, otherwise has on effect.
 * @returns Always returns `obj`.
 * @example
 * ```ts
 * import freeze from "apprt-core/freeze";
 * let src = {x: 1, y: { a: 2 } };
 * let srcFrozen = freeze(src);
 * src === srcFrozen // -> true
 * src.x = 3 // still 1, change not possible
 * src.y.a = 3 // still 2, change not possible
 * ```
 */
declare function freeze<T>(obj: T): DeepFrozen<T>;

export { freeze as default, freeze };
export type { DeepFrozen };