export type AtomicWritePoint = "after-file-sync" | "before-commit" | "after-commit" | "after-directory-sync";
export type AtomicFaultInjector = (point: AtomicWritePoint) => void | Promise<void>;
export interface AtomicJsonWriteOptions {
    readonly createOnly?: boolean;
    readonly fault?: AtomicFaultInjector;
}
/**
 * Writes one private JSON record through a same-directory atomic commit.
 *
 * `createOnly` uses an exclusive hard-link commit so a contender can never
 * replace an existing record. Replacement uses rename. In both cases the
 * complete file is synced before it becomes visible and the parent directory
 * is synced after the namespace mutation.
 */
export declare function writeAtomicJson(path: string, value: unknown, options?: AtomicJsonWriteOptions): Promise<void>;
export declare function readJson(path: string): Promise<unknown | undefined>;
export declare function syncDirectory(path: string): Promise<void>;
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