/** Set on each element a streaming patch inserts, for one entrance animation. */
export declare const STREAMED_IN_ATTRIBUTE = "data-agent-native-streamed-in";
/**
 * Entrance motion for streamed-in elements. Only the outermost new element
 * animates; its new descendants arrive with it. Where frames are drafted
 * (`createDraftOutlines`), the draft times each reveal instead.
 */
export declare const STREAMED_IN_CSS = "\n@keyframes agent-native-streamed-in {\n  from { opacity: 0; transform: translateY(6px); filter: blur(2px); }\n  to { opacity: 1; transform: none; filter: none; }\n}\n[data-agent-native-streamed-in] {\n  animation: agent-native-streamed-in 320ms cubic-bezier(0.2, 0, 0, 1) both;\n}\n[data-agent-native-drafting] [data-agent-native-streamed-in] { animation: none; }\n@media (prefers-reduced-motion: reduce) {\n  [data-agent-native-streamed-in] { animation: none; }\n}\n";
/**
 * Patches `target`'s children to match `source` in place. Nodes that match
 * by position and tag are kept, so text grows inside elements already on
 * screen and nothing replays its entrance; new elements get `markAttribute`
 * and are passed to `onInsert`. A kept element that `keepChildren` claims
 * has its attributes synced but its children left alone, for content another
 * renderer owns, such as a React portal's slot.
 *
 * With `ownership`, only the nodes the stream inserted are compared or
 * removed, and an attribute changes only while it still holds the value the
 * stream gave it. A runtime working on the result (Alpine's `x-for` clones,
 * `x-text`, `x-show`'s style, `:class`) is not in the source, so a positional
 * comparison would otherwise overwrite or delete its work.
 *
 * This function is serialized into sandboxed preview frames with
 * `Function.prototype.toString`, so it must not reference anything outside
 * its own body.
 */
export interface StreamOwnership {
    /** Nodes the stream inserted. */
    nodes: WeakSet<Node>;
    /** The attributes the stream last gave each element it owns. */
    attributes: WeakMap<Element, Map<string, string>>;
}
export declare function morphChildren(target: Node, source: Node, markAttribute: string, onInsert?: (element: Element) => void, keepChildren?: (element: Element) => boolean, ownership?: StreamOwnership): void;