/**
 * Task / to-do list feature.
 *
 * Each <li> is the single editable surface. The checkbox is a custom
 * <span class="ray-task-checkbox" contenteditable="false"> followed by a plain
 * text node — no nested contenteditable spans, no native inputs.
 *
 * DOM structure (inside editor):
 *   <ul class="ray-task-list">
 *     <li class="ray-task-item" data-checked="false">
 *       <span class="ray-task-checkbox" contenteditable="false" role="checkbox"
 *             aria-checked="false" aria-label="Task status"></span>
 *       Buy milk
 *     </li>
 *   </ul>
 *
 * getContent() output (clean HTML — span stripped, data-checked preserved):
 *   <ul class="ray-task-list">
 *     <li data-checked="false">Buy milk</li>
 *   </ul>
 *
 * setContent() / restoreFromHTML: bare <li data-checked> → span + text node.
 * Also migrates old formats (span+text-span, native input) automatically.
 */
export declare class TaskListFeature {
    private editorArea;
    constructor(editorArea: HTMLElement);
    /** Insert a new task list at the current cursor position */
    insertTaskList(): void;
    /** Build a single task list item: custom checkbox span + text node */
    buildTaskItem(checked: boolean, text: string): HTMLLIElement;
    /**
     * Handle Enter and Backspace inside task list items.
     * - Enter on non-empty item → split text at cursor into new task item
     * - Enter on empty item     → exit task list, insert <p> after
     * - Backspace at text start → convert item to <p>, remove from list
     */
    handleKeydown(e: KeyboardEvent): void;
    /**
     * Rebuild task list items from clean getContent() HTML (bare li[data-checked]).
     * Also migrates old formats (span+text-span, native input) automatically.
     */
    static restoreFromHTML(container: HTMLElement): void;
    private static buildCheckboxSpan;
    /** Return the text node that follows the checkbox span (the canonical content node). */
    private getTextNode;
    /**
     * If the browser allowed text/nodes to slip before the checkbox span
     * (e.g. cursor was at li[offset=0] and user typed), move them to after the span.
     * Called at the start of every keydown handler to guarantee structure before splits.
     */
    private normalizeTaskItem;
    /**
     * Intercept click on the checkbox span: toggle checked state,
     * sync data-checked / aria-checked / .checked class.
     */
    private bindClickHandler;
}
/**
 * Serialize task list items for getContent() output.
 * Removes the checkbox span; text node stays → clean <li data-checked>text</li>.
 */
export declare function serializeTaskLists(container: HTMLElement): void;
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