import { type SealedAttachmentKey } from "@gryt/crypto";
export type MlsDmContent = {
    type: "message";
    /** Made by the sender, a UUID. Edits and deletes name it. */
    id: string;
    text: string;
    replyTo?: string;
    /** Upload id to what `sealAttachment` returned; `openAttachment` takes it as `meta`. */
    attachments?: Record<string, SealedAttachmentKey>;
} | {
    type: "edit";
    id: string;
    text: string;
} | {
    type: "delete";
    id: string;
} | {
    type: "reaction";
    /** The message reacted to, the way edits and deletes name theirs. */
    id: string;
    /** A Unicode emoji, or a server emoji as `:name:`, the same string `chat:react` carries. */
    emoji: string;
    /** Explicit rather than a toggle, so a repeat or a reorder lands the same on every device. */
    action: "add" | "remove";
};
export declare const MLS_DM_CONTENT_VERSION = 1;
/** The same bytes the phone writes: `v` first, then the content's fields in this order. */
export declare function encodeMlsDmContent(content: MlsDmContent): Uint8Array;
/** Null for anything this version can't read: a newer version, a new type, or junk. */
export declare function decodeMlsDmContent(bytes: Uint8Array): MlsDmContent | null;
/**
 * Like `decodeMlsDmContent`, but tells content from a newer app ("newer", skip it quietly)
 * apart from junk (null, which is worth counting). A known type with a bad field is junk.
 */
export declare function readMlsDmContent(bytes: Uint8Array): MlsDmContent | "newer" | null;