/**
 * VNode normalization utilities.
 * Converts render results into proper VNode structures.
 */
import { VNode, JSXElement } from '../jsx-runtime.js';
/**
 * Normalize render result to a VNode (wrapping arrays in Fragment).
 * Handles null, undefined, false, true by returning an empty Text node.
 *
 * This is used to normalize the return value of component render functions
 * into a consistent VNode structure for the renderer to process.
 *
 * @example
 * ```ts
 * // Conditional rendering returns null/false
 * normalizeSubTree(null)     // → empty Text node
 * normalizeSubTree(false)    // → empty Text node
 *
 * // Arrays become Fragments
 * normalizeSubTree([<A/>, <B/>])  // → Fragment with children
 *
 * // Primitives become Text nodes
 * normalizeSubTree("hello")  // → Text node
 * normalizeSubTree(42)       // → Text node
 *
 * // Computed signals are auto-unwrapped
 * normalizeSubTree(computed(() => "hi"))  // → Text node with "hi"
 *
 * // VNodes pass through
 * normalizeSubTree(<div/>)   // → same VNode
 * ```
 */
export declare function normalizeSubTree(result: JSXElement | JSXElement[] | null | undefined | boolean | (() => any)): VNode;
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