/**
 * Backup path formatting and pre-import backup file writer.
 *
 * Split out of `lib/storage.ts` in RC-2. `createTimestampedBackupPath` is a
 * pure path builder that every backup caller can use without taking a
 * dependency on the import pipeline. `writePreImportBackupFile` is the
 * bounded-time writer used inside `importAccounts` to snapshot the existing
 * accounts file before apply.
 *
 * Every file written here holds live refresh tokens, so the writer is the one
 * place that owns the 0600 mode, the bounded write time, and the temp+rename
 * swap. `writeBackupFileContent` exists so a caller that already has the exact
 * bytes it wants preserved — the pre-write credential snapshotter, which
 * copies the previous file verbatim rather than re-serializing it — does not
 * hand-roll a second writer with weaker guarantees.
 */
import type { AccountStorageV3 } from "./migrations.js";
/**
 * The `backups/` directory that belongs to one accounts file.
 *
 * Every backup kind shares it: pre-import backups, keychain migration
 * artefacts, pre-global-migration directories, and credential snapshots. A
 * caller that prunes must therefore scope its deletes by its own filename
 * prefix rather than by this directory.
 */
export declare function getBackupDirectory(storagePath: string): string;
/**
 * Timestamped backup path beside an explicitly named accounts file.
 *
 * Callers that write a backup for a path other than the currently active one —
 * the global-storage migration writes to the global file while a project path
 * is active — must use this rather than {@link createTimestampedBackupPath},
 * so the backup lands next to the file it describes.
 */
export declare function createTimestampedBackupPathFor(storagePath: string, prefix?: string): string;
export declare function createTimestampedBackupPath(prefix?: string): string;
/**
 * Write one backup file atomically, with a bounded write time and mode 0600.
 *
 * `content` is written verbatim. Temp+rename keeps a half-written backup from
 * ever being visible under its final name, and the timeout keeps a stuck disk
 * from blocking the operation the backup precedes.
 */
export declare function writeBackupFileContent(backupPath: string, content: string): Promise<void>;
export declare function writePreImportBackupFile(backupPath: string, snapshot: AccountStorageV3): Promise<void>;
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