/**
 * Renders a list of items with optional keys and separators.
 *
 * @template T - The type of items in the array
 * @template U - The JSX element type returned by the render function
 * @param props.each - Array of items to render
 * @param props.key - Optional key function for efficient updates (uses lit-html's repeat directive)
 * @param props.separator - Optional JSX element to insert between items
 * @param props.children - Render function that receives each item and its index
 * @returns An iterator from either the map or repeat directive, depending on whether a key function is provided.
 *
 * @example
 * ```tsx
 * <For each={users} key={(user) => user.id}>
 *   {(user, index) => <div key={user.id}>{user.name}</div>}
 * </For>
 * ```
 */
export declare function For<T, U extends LitJSX.Child>(props: {
    each: readonly T[];
    key?: (item: T, index: number) => any;
    separator?: LitJSX.Child;
    children: (item: T, index: number) => U;
}): LitJSX.Child;
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