/**
 * The language the widget speaks: the `locale` property, else the document's,
 * else the browser's. Everything locale-dependent — labels and timestamps
 * alike — goes through this, so they cannot disagree.
 *
 * @param {string | undefined} locale
 * @returns {string | undefined} undefined means "whatever the browser uses".
 */
export function resolveLocale(locale: string | undefined): string | undefined;
/**
 * Pick the label set for a locale, falling back to English for anything we do
 * not ship. `overrides` is the host's `labels` property.
 *
 * @param {string | undefined} locale
 * @param {Partial<Labels> | undefined} [overrides]
 * @returns {Labels}
 */
export function resolveLabels(locale: string | undefined, overrides?: Partial<Labels> | undefined): Labels;
export type Labels = {
    /**
     * Accessible name of the closed-state button.
     */
    launcher: string;
    /**
     * Accessible name of the dialog.
     */
    panel: string;
    /**
     * Accessible name of the message log.
     */
    conversation: string;
    /**
     * Close button.
     */
    close: string;
    /**
     * Home button: back to the start of the conversation.
     */
    home: string;
    /**
     * Send button.
     */
    send: string;
    /**
     * Attach button beside the composer.
     */
    attach: string;
    /**
     * Composer textarea.
     */
    input: string;
    /**
     * Announced while the other side is typing.
     */
    typing: string;
    /**
     * Announced while waiting for an answer.
     */
    loading: string;
    /**
     * The panel's drag handle.
     */
    move: string;
    /**
     * "Jump to newest" button.
     */
    toLatest: string;
    /**
     * Delivery state of one's own message.
     */
    status: {
        sending: string;
        sent: string;
        error: string;
    };
    /**
     * Counter, with {n} for the number remaining.
     */
    charactersLeft: string;
    /**
     * Counter past the limit, with {n} for the excess.
     */
    overLimit: string;
};