import{type PropertyValues,type TemplateResult}from'lit';import{LyraElement}from'../../../internal/lyra-element.js';import{type LyraTimestamp}from'../timestamp.js';export interface CheckpointRestoreDetail{checkpointId:string;label:string;}export interface LyraCheckpointEventMap{'lr-restore':CustomEvent<CheckpointRestoreDetail>;}
/** `true`-defaulting boolean attribute converter -- Lit's default presence-based `type: Boolean`
*  can never be set back to `false` from a plain-HTML attribute once the property's own default is
*  `true` (removing an attribute that was never present fires no `attributeChangedCallback`), so
*  `fromAttribute` checks the literal string instead. Shared by both `restorable` and
*  `confirmRestore`, which have the identical `true`-default parsing need. */
/**
* `<lr-checkpoint>` — an inline conversation restore point: a labeled marker between messages
* whose Restore affordance confirms inline, then hands the host a `lr-restore` event. This
* component persists and restores nothing itself — host state in, events out.
*
* @customElement lr-checkpoint
* @slot - Optional supplemental content under the marker row (e.g. what changed since this
*   point).
* @event lr-restore - Restore was activated (after the inline confirm step, when
*   `confirmRestore` is on). `detail: { checkpointId, label }`. Not cancelable — a request; this
*   component performs no default action and stores nothing.
* @csspart base - The marker root (`role="group"`).
* @csspart line - Each of the two flanking rules.
* @csspart icon - The bookmark glyph.
* @csspart label - The computed label text.
* @csspart timestamp - The formatted `timestamp`, when set.
* @csspart restore-button - The Restore button. Only rendered while `restorable`.
* @csspart confirm-group - The inline confirm prompt, swapped in for `restore-button` while
*   confirming.
* @csspart confirm-prompt - The confirm prompt text.
* @csspart confirm-button - Confirms the restore, firing `lr-restore`.
* @csspart cancel-button - Cancels, reverting to `restore-button`.
* @cssprop [--lr-checkpoint-spin-duration=var(--lr-transition-ambient)] - Restoring-spinner
*   timing, inheriting the shared ambient-motion token by default (stopped under reduced motion).
* @status stable
* @since 4.0.0
*/
export declare class LyraCheckpoint extends LyraElement<LyraCheckpointEventMap>{static styles:import("lit").CSSResultGroup[];
/** Opaque id echoed in the `lr-restore` event detail. */
checkpointId:string;
/** Checkpoint name. The generic `'Checkpoint'` fallback renders while empty. */
label:string;
/** Optional creation time, rendered as `<time datetime>`, default `hour:minute` in
*  `effectiveLocale`. Invalid strings are treated as unset. */
timestamp?:LyraTimestamp;
/** Overrides the default `hour:minute` rendering of `timestamp`. */
formatTimestamp?:(date:Date)=>string;
/** When `false`, renders a plain marker with no button — for read-only views, or the currently-
*  restored checkpoint. */
restorable:boolean;
/** Gates the `lr-restore` event behind the inline confirm step. */
confirmRestore:boolean;
/** Host-set busy state: the Restore button becomes `aria-disabled="true"` with a spinner beside
*  the localized "Restoring…" text. */
restoring:boolean;private confirming;private readonly confirmPromptId;private focusGeneration;private get computedLabel();private get normalizedTimestamp();private fireRestore;private onRestoreClick;private revertToRestore;private onConfirmClick;private onCancelClick;private onConfirmGroupKeyDown;private onConfirmGroupFocusOut;protected willUpdate(changed:PropertyValues<this>):void;disconnectedCallback():void;click():void;render():TemplateResult;}declare global{interface HTMLElementTagNameMap{'lr-checkpoint':LyraCheckpoint;}}