/**
 * `secretsPreservingProxy` is a helper that takes an input and ensures any properties
 * that are secrets are (a) unwrapped to return raw values and (b) preserve secretness
 * upon writes. This ensures that secret values are preserved even if replaced.
 *
 * @param toProxy the object whose property accesses to proxy.
 */
export declare function secretsPreservingProxy<T>(toProxy: any): any;