import type { Files } from "../../index.js";
/**
 * Mark `dir` — a normalized key prefix without a trailing slash — as `plugin`'s
 * private storage on `files`. Called from the plugin's `extend`, which re-runs
 * on every instance derived from it (`files.readonly()`).
 */
export declare const reserveKeyPrefix: (files: Files, plugin: string, dir: string) => void;
/** Every key prefix a plugin on `files` has reserved. */
export declare const reservedKeyPrefixes: (files: Files) => string[];
/**
 * Whether `key` (or a list prefix) is a reserved dir itself or lies anywhere
 * beneath one — exactly the keys and prefixes the plugins neither hide from
 * `list()` nor treat as live objects. Matched however the key is spelled: a
 * case-insensitive store resolves `.TRASH/x` to the trash, and a Windows
 * filesystem reads `.trash\x` as a path inside it.
 */
export declare const isReservedKey: (key: string, dirs: readonly string[]) => boolean;
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