import { Rebaseable } from '@atlaskit/prosemirror-collab';
/**
 * Compose adjacent streaming frames in the unconfirmed queue so the collab service receives one
 * step per flush instead of one step per rendered chunk.
 *
 * This runs in the collab plugin's `transformUnconfirmed` hook, which fires *after* each frame has
 * already been applied to the document. Collapsing therefore has no effect on what the local user
 * sees, on undo history, or on any other plugin state — it only changes what is sent to the collab
 * service, and what is used as the rebase buffer when remote steps arrive.
 *
 * Because the unconfirmed steps double as the rebase buffer (`rebaseSteps` applies their inverses
 * to the live document), the composition must be exact. `mergeOverlappingSteps` only returns a
 * merge it can prove exact, and this function degrades to a no-op whenever it declines.
 *
 * @param steps Rebaseable steps
 * @returns Rebaseable steps, with adjacent streaming frames composed
 */
export declare function collapseStreamingSteps(steps: Rebaseable[]): Rebaseable[];