/**
 * Shared DOM utility helpers used across editor features.
 */
/**
 * Returns true if `el` is a block-level element with no meaningful content
 * (empty or only contains a single <br>).
 */
export declare function isEmptyBlock(node: Node): boolean;
/**
 * Inserts `newEl` into `editorArea` relative to the cursor's block ancestor,
 * avoiding double-paragraph artifacts.
 *
 * Strategy:
 * - If the cursor's direct-child-of-editorArea block is empty: insert `newEl`
 *   BEFORE it so the existing empty paragraph serves as the exit spacer after.
 * - If the block has content: insert `newEl` AFTER it, then append `spacer` only
 *   when the next sibling isn't already a paragraph.
 *
 * Returns the spacer paragraph that was used (either the original empty block
 * reused as spacer, or a newly created one), so callers can place the cursor.
 */
export declare function insertBlockAtCursor(editorArea: HTMLElement, range: Range, newEl: HTMLElement, createSpacer?: boolean): HTMLElement;
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