/**
 * Reads the stored text for `key`, or null when unset, without parsing it. Throws on a
 * store failure; lets a caller tell a failed read from unparseable content.
 */
export declare function getRuntimeStateText(key: string): string | null;
/**
 * Reads a JSON value for `key`, or null when unset.
 */
export declare function getRuntimeStateJson<T>(key: string): T | null;
/**
 * Upserts a JSON-serializable value for `key` without touching other keys.
 */
export declare function setRuntimeStateJson(key: string, value: unknown): void;
/**
 * Runs `fn` inside BEGIN IMMEDIATE so cross-process writers serialize safely.
 */
export declare function withImmediateTransaction<T>(fn: () => T): T;
/** Visible for integration tests that need an isolated database file. */
export declare function resetRuntimeStateDbForTests(): void;
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