/**
 * Strip empty-string defaults from richtext fields in a Puck config.
 *
 * Puck merges `defaultProps` underneath stored props on every render, so a
 * block whose stored props omit a richtext key silently renders that key's
 * default. An empty-string default is fatal there: Puck's RichTextRender wraps
 * any non-HTML string as `{type:"text", text: value}`, and prosemirror-model
 * rejects a zero-length text node with `RangeError: Empty text nodes are not
 * allowed` — taking down the whole subtree, since that render path has no error
 * boundary. `undefined` is safe (it normalizes to an empty doc), so dropping
 * the key is strictly better than defaulting to "".
 *
 * Runs over nested object/array fields too, since richtext commonly lives
 * inside array items.
 */
/**
 * Return a config with empty-string richtext defaults removed. Returns the
 * input unchanged (same reference) when there is nothing to strip, so it is
 * safe to call in a render path without breaking Puck's memoization.
 */
export declare function sanitizeRichtextDefaults<T>(config: T): T;