import type { MessageDeltaPayload } from "./protocol/events.js";
import type { Message } from "./protocol/messages.js";
/** The result of applying one offset-addressed text delta to a message snapshot. */
export type MessageDeltaApplication = {
    append: string;
    kind: "applied";
    message: Message;
} | {
    append: "";
    kind: "replayed";
    message: Message;
} | {
    kind: "reconcile";
};
/**
 * Applies one message delta without duplicating replayed text.
 *
 * A gap, conflicting overlap, missing message, or non-textual target cannot be
 * repaired locally and returns `reconcile` so the caller can replace the
 * message from authoritative history or a later full `message.updated` event.
 */
export declare function applyMessageDelta(message: Message | undefined, delta: MessageDeltaPayload): MessageDeltaApplication;
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