/**
 * Module-scoped storage state and the single shared mutex that serializes
 * every read-modify-write against the accounts files.
 *
 * Split out of `lib/storage.ts` in RC-2 so the identity helpers, normalize,
 * load/save, flagged, and export-import modules can all share the same
 * resolved path and the same lock without creating circular imports.
 *
 * Invariants this module preserves:
 *   - `currentStoragePath` is either `null` (use global fallback) or an
 *     absolute path to a project-scoped accounts file.
 *   - `currentProjectRoot` is only non-null when `currentStoragePath` is
 *     project-scoped; `setStoragePathDirect` deliberately clears it so
 *     ad-hoc overrides (tests, one-off CLI paths) never look like a real
 *     project.
 *   - `withStorageLock` chains every critical section through a single
 *     promise so nothing can interleave between a load and its paired save.
 */
/**
 * Serializes storage I/O to keep account file reads/writes lock-step and avoid
 * cross-request races during migration/seeding flows.
 */
export declare function withStorageLock<T>(fn: () => Promise<T>): Promise<T>;
export declare function subscribeToStoragePathChanges(listener: () => void): () => void;
export declare function setStoragePath(projectPath: string | null): void;
export declare function setStoragePathDirect(path: string | null): void;
/**
 * Returns the file path for the account storage JSON file.
 * @returns Absolute path to the accounts.json file
 */
export declare function getStoragePath(): string;
export declare function getCurrentStoragePath(): string | null;
export declare function getCurrentLegacyProjectStoragePath(): string | null;
export declare function getCurrentProjectRoot(): string | null;
/**
 * Returns the project storage key (e.g. `my-project-abc123def456`) that the
 * active project storage path is rooted under, or `null` when no per-project
 * root is active (global storage is in use). Used by the opt-in keychain
 * backend as the account identifier so each project's credentials live
 * under a distinct (service, account) pair in the OS keychain.
 *
 * When `setStoragePathDirect` overrode the path to something outside the
 * standard per-project layout (tests, custom CLI override), we fall back to
 * `null` because there is no meaningful project identity to key off.
 */
export declare function getCurrentProjectStorageKey(): string | null;
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