import type { Transaction } from '@atlaskit/editor-prosemirror/state';
/**
 * Upper bound on how long the send may stay held, measured from the transaction that *started* the
 * hold rather than the most recent one.
 *
 * This is the only time bound on the hold. Producers decide when to release on semantic grounds —
 * a completed block, the end of a stream — and this bounds how long that can take. It therefore
 * doubles as the guarantee that a producer which never releases, because it aborted or threw
 * between hold and release, cannot stop the editor sending for the rest of the session.
 */
export declare const MAX_SEND_HOLD_MS = 2000;
export type CollabSendHold = {
    /**
     * Whether the flush is currently held. Reads the clock, so a hold that has outlived
     * {@link MAX_SEND_HOLD_MS} reports as released without needing a transaction to clear it.
     */
    isHeld: (now?: number) => boolean;
    /**
     * Feed every transaction through this. Transactions that carry no {@link DEFER_COLLAB_SEND}
     * metadata leave the hold untouched — that is the whole point of the hold being sticky rather
     * than per-transaction.
     */
    observe: (transaction: Readonly<Transaction>, now?: number) => void;
};
/**
 * Tracks whether sending to the collab service is currently held back.
 *
 * A producer that streams into the document needs several of its transactions to accumulate in the
 * unconfirmed queue before anything is sent, so they can be composed into one step. Marking only
 * the producer's own transactions is not enough: `sendTransaction` runs for *every* state update,
 * and `provider.send` flushes and locks the entire queue regardless of which transaction triggered
 * it. Acknowledgements from previous commits, remote steps, selection changes and the user's own
 * typing all trigger it.
 *
 * So the hold has to be a state that spans transactions rather than a flag on one:
 *
 * - `tr.setMeta(DEFER_COLLAB_SEND, true)` starts the hold, and does *not* extend one already in
 *   progress
 * - `tr.setMeta(DEFER_COLLAB_SEND, false)` releases it
 * - anything else leaves it as it is
 *
 * Not extending matters. A producer marks every frame it wants held, so re-arming on each one
 * would push the deadline back indefinitely and the bound would never be reached during an active
 * stream. Measuring from the first held transaction instead makes the hold flush at least every
 * {@link MAX_SEND_HOLD_MS}, with the next held frame starting a fresh window.
 *
 * While held, nothing is sent. Note this includes the local user's own edits: `sendableSteps`
 * returns the queue in version order, so there is no way to send a step that sits behind held
 * steps. Producers should keep hold windows short for that reason.
 */
export declare const createCollabSendHold: () => CollabSendHold;