/**
 * Adapter interface for caching `PgFileSystem` read results.
 *
 * Adapters are intentionally tiny: byte-oriented `get`/`set`, batch `delete`,
 * and prefix `clear`. Encoding and key composition live in the wrapper, not
 * here, so a Redis adapter and an in-memory `Map` can share the same shape.
 *
 * Keys are composed by the wrapper as
 * `${workspaceId}:${versionLabel}:${op}:${path}` (and similar). Adapters MUST
 * NOT inspect or rewrite keys; they are opaque strings.
 */
export interface FsCache {
    /** Return the value previously stored under `key`, or `null` if absent or expired. */
    get(key: string): Promise<Uint8Array | null>;
    /**
     * Store `value` under `key`. If `ttlMs` is provided, the entry expires after
     * that many milliseconds; otherwise it lives until evicted by the adapter's
     * own policy (e.g. LRU) or removed by `delete`/`clear`.
     */
    set(key: string, value: Uint8Array, ttlMs?: number): Promise<void>;
    /** Remove every supplied key. Missing keys are silently ignored. */
    delete(keys: string[]): Promise<void>;
    /** Remove every entry whose key starts with `prefix`. Used for workspace/version invalidation. */
    clear(prefix: string): Promise<void>;
}
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