import { type Locale } from './i18n.js';
export declare const REACTION_EMOJIS: readonly ["👍", "❤️", "😂", "🎉", "😢", "🔥"];
/** @internal Not part of the package's public API surface; not re-exported from index.ts. Kept exported for cross-file use within the package. */
export type ReactionEmoji = (typeof REACTION_EMOJIS)[number];
/** Heart-first affordance (spec amendment 2026-07-14): the per-bubble heart
 *  button always targets this one emoji — single source of truth so its
 *  string literal never drifts from REACTION_EMOJIS[1]. */
export declare const HEART_EMOJI: ReactionEmoji;
/** `lang` defaults to 'en' so every existing call site (incl. direct-import
 *  unit tests) keeps working without a signature change. */
export declare function reactionAriaLabel(emoji: string, lang?: Locale): string;
/** Full aria-label for a reaction chip button: emoji name + count + an
 *  optional "you reacted" suffix. Was inlined as string concatenation in
 *  message-list.ts (`${reactionAriaLabel(emoji)}, ${count} reaction${count
 *  !== 1 ? 's' : ''}${isOwn ? ', you reacted' : ''}`) — moved here so the
 *  RU pluralization rule lives next to the emoji-name table it composes with. */
export declare function reactionButtonAriaLabel(emoji: string, count: number, isOwn: boolean, lang?: Locale): string;
/** Lookup: does the caller's `ownReactions` set contain this emoji?
 *  Pure so the chip-highlight logic is unit-testable without
 *  mounting the component. */
export declare function isOwnReaction(emoji: string, ownReactions: ReadonlyArray<string> | undefined): boolean;
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