import{type PropertyValues,type TemplateResult}from'lit';import{LyraElement}from'../../../internal/lyra-element.js';import'../../utility/live-region/live-region.class.js';import type{LyraToolbarAction}from'../message-actions/toolbar-actions.js';export interface LyraBranchPickerEventMap{'lr-branch-change':CustomEvent<{index:number;}>;'lr-toolbar-actions-change':Event;}
/**
* `<lr-branch-picker>` — the "‹ 2 / 5 ›" navigator across regenerated/edited variants of one
* message. Pure controlled: it never mutates its own `index` — the same contract `<lr-pagination>`
* already establishes for `page`. The host listens for `lr-branch-change`, swaps the displayed
* branch content, and applies the new `index` back.
*
* Renders nothing at all while `count < 2`, so a host can bind it unconditionally on every message
* regardless of whether that message actually has multiple branches yet.
*
* @customElement lr-branch-picker
* @event lr-branch-change - A branch navigation was requested. `detail: { index }` — always a
*   valid target (never past either bound); the consumer applies `index` after switching the
*   displayed branch content.
* @event lr-toolbar-actions-change - No-detail coordination event emitted when the logical
*   toolbar actions exposed by this provider change availability or order.
* @csspart base - The group wrapper (`role="group"`).
* @csspart previous-button - The previous-branch chevron button.
* @csspart previous-glyph - The chevron glyph wrapper inside `previous-button`.
* @csspart next-button - The next-branch chevron button.
* @csspart next-glyph - The chevron glyph wrapper inside `next-button`.
* @csspart position - The visible "2 / 5" text.
* @status stable
* @since 4.0.0
*/
export declare class LyraBranchPicker extends LyraElement<LyraBranchPickerEventMap>{static styles:import("lit").CSSResultGroup[];
/** 0-based current branch, rendered 1-based ("2 / 5"). Controlled -- this component never writes
*  to it itself. */
index:number;
/** Total number of branches. While `count < 2` the component renders nothing at all. */
count:number;
/** Accessible name for the group. Defaults to the localized `branchPickerLabel`. */
label:string;private previousButtonEl?;private nextButtonEl?;private liveRegion?;private readonly groupId;
/** Gates the position announcement so a freshly-mounted picker never announces its own initial
*  position -- mirrors `<lr-chat-message>`'s identical `isMounting` gate for status-change
*  announcements. */
private isMounting;private readonly previousToolbarAction;private readonly nextToolbarAction;private createToolbarAction;
/** Ordered logical actions exposed to an enclosing toolbar without exposing shadow nodes.
*  A parent releases its optional lease when this provider leaves, restoring an untouched
*  authored chevron tabindex without replacing a later consumer value. */
getToolbarActions():readonly LyraToolbarAction[];
/** Read-time-safe view of `count` -- non-negative, finite, truncated to a whole branch count.
*  Both `index` and `count` are fully controlled (this component never writes to them), so an
*  out-of-range/non-finite value assigned from outside would otherwise reach the `count - 1`/
*  `index + 1` arithmetic below unsanitized; a non-finite value falls back to `1` (matching the
*  property's own default), which keeps the render-nothing-while-`count < 2` contract intact
*  instead of throwing or displaying `NaN`. */
private get normalizedCount();
/** Read-time-safe view of the controlled `index` property, clamped to `[0, normalizedCount - 1]`
*  -- never mutates `index` itself, matching this component's fully controlled contract (mirrors
*  `<lr-pagination>`'s identical `currentPage` pattern). */
private get normalizedIndex();
/** Focuses whichever chevron button isn't currently `disabled` -- mirrors `<lr-copy-button>`'s
*  own `focus()`-delegation-to-the-internal-control pattern, so this component composes cleanly
*  as one stop inside a parent toolbar. */
focus(options?:FocusOptions):void;blur():void;
/** Activates the currently enabled chevron, matching a click on the shadow control. */
click():void;protected updated(changed:PropertyValues):void;disconnectedCallback():void;adoptedCallback():void;private releaseToolbarActions;private formatPosition;private requestIndex;render():TemplateResult;}declare global{interface HTMLElementTagNameMap{'lr-branch-picker':LyraBranchPicker;}}