/**
 * Ownership and permission rules for a directory Pioneer will write private material into.
 *
 * A directory is only as trustworthy as every ancestor above it: a private child under a
 * non-sticky group- or world-writable parent can be renamed away and replaced by another local
 * user, who then receives whatever the controller writes next and whatever its cleanup removes.
 * The walk therefore covers the whole chain, following both the resolved and the canonical path
 * so a symlinked ancestor cannot hide a replaceable one.
 */
export declare function isTrustedStickyApplicationDataParent(parentUid: number, childUid: number, currentUid: number): boolean;
export declare function isTrustedApplicationDataOwner(ownerUid: number, currentUid: number): boolean;
export declare function assertStableDirectoryChain(directory: string, platform: NodeJS.Platform, label: string): Promise<void>;
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