/**
 * Return a value.
 *
 * @param key A string.
 * @return The stored value or `undefined`.
 */
export declare function globalStateGet(key: string, defaultValue?: any): Promise<any>;
/**
 * Store a value. The value must be JSON-stringifyable.
 *
 * @param key A string.
 * @param value A value. MUST not contain cyclic references.
 */
export declare function globalStateUpdate(key: string, value: any): Promise<void>;
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