/**
 * Captures `value` on the first render and returns that captured value for the
 * component's lifetime, ignoring later changes.
 *
 * Used for `default*` props, which follow React's uncontrolled convention: the
 * prop seeds the initial state and subsequent updates are ignored.
 *
 * Only the prop value is frozen, never a value derived from it, so a
 * percentage width still resolves against the live container on every render.
 *
 * @internal
 */
export declare function useMountValue<T>(value: T): T;
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