/**
 * Deep readonly type. Currently only handles arrays, objects, and primitives (not sets or maps).
 */
export type DeepReadonly<T> = T extends (infer U)[] ? ReadonlyArray<DeepReadonly<U>> : T extends object ? {
    readonly [K in keyof T]: DeepReadonly<T[K]>;
} : T;
/**
 * Deep `Object.freeze()` a JSON-like object in place.
 * Returns the original object (now frozen) for convenience and typing.
 *
 * (This can be moved to a common location if anything else needs it in the future.)
 */
export declare function deepFreeze<T>(obj: T): DeepReadonly<T>;
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