/**
 * Read `[value, setter]` for a declared `contextSpec` slot. The
 * iframe runtime owns the underlying `useState` and seeds each
 * Provider; the boilerplate auto-generates one `useGguiContext`
 * call per declared slot at the top of the component body, so the LLM
 * has `slotName` + `setSlotName` in scope without writing any
 * `useState` or `<Provider>` itself.
 *
 * Direction: client → agent (one-way). Every value change is mirrored
 * to the host LLM's context (debounced) by the runtime.
 *
 * **Throws synchronously** when the slot isn't registered. This is a
 * fail-loud signal: the boilerplate destructure drifted from the
 * contract, OR `contextSpec` doesn't declare the slot, OR the runtime
 * hasn't installed the Context registry yet. Authors should see the
 * error message and fix one of those three sites — silent fallback
 * would mask an architectural bug.
 *
 * @example
 * ```tsx
 * // boilerplate auto-prepends:
 * const [currentStep, setCurrentStep] =
 *   useGguiContext<number>('currentStep');
 *
 * // LLM body:
 * <Button onClick={() => setCurrentStep((s) => s + 1)}>Next</Button>
 * ```
 *
 * @public
 */
export declare function useGguiContext<T>(slotName: string): readonly [T, (next: T | ((prev: T) => T)) => void];
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