/**
* Install Temporal polyfill.
* @param overwrite Whether to overwrite an existing Temporal implementation
*/
export declare function install(overwrite: boolean): void;
/**
* Set TTL for `Temporal.Now.timeZoneId` cache (`Infinity` means no expiration). Pass `0` to clear and disable cache again.
* @param ttl TTL in milliseconds
*/
export declare function setSystemTimeZoneIdCacheTtl(ttl: number): void;