import{type PropertyValues,type TemplateResult}from'lit';import{LyraElement}from'../../../internal/lyra-element.js';import type{LyraAccordionAppearance,LyraAccordionHeadingLevel,LyraAccordionIconPlacement}from'./accordion-types.js';export type{LyraAccordionAppearance,LyraAccordionHeadingLevel,LyraAccordionIconPlacement,}from'./accordion-types.js';
/**
* `<lr-accordion-item>` — an accessible expandable section for `<lr-accordion>`.
*
* The item deliberately owns only Web Awesome's accordion-item vocabulary. Use `expanded`,
* `label`, and `expand()`/`collapse()`/`toggle()` here; the independent `open`, `summary`, and
* `show()`/`hide()` disclosure vocabulary belongs to `<lr-details>`.
*
* A present host `aria-label`, including an explicitly empty value, names the trigger button.
* When absent, the trigger retains its native name-from-content behavior.
*
* @customElement lr-accordion-item
* @slot - Panel content.
* @slot label - Visible header label; takes priority over the `label` property. Its flattened
*   subtree is inert and hidden from assistive technology, while its accessibility-visible text
*   names the sole trigger button.
* @slot icon - Optional decorative expand/collapse icon. Its flattened subtree remains visible
*   but is inert and hidden from assistive technology; the trigger button is the sole action.
* @csspart base - Deprecated compatibility name for the outer wrapper; use `accordion-item`.
* @csspart accordion-item - The outer wrapper. It is the same node as `base`.
* @csspart heading - Heading around the trigger; omitted for `heading-level="none"`.
* @csspart button - The trigger button.
* @csspart label - Label container.
* @csspart icon - Expand/collapse icon container.
* @csspart panel - Expandable panel.
* @csspart content - Content container inside the panel.
* @cssprop [--lr-accordion-item-outlined-bg=var(--lr-color-surface)] - Outlined item background.
* @cssprop [--lr-accordion-item-filled-bg=var(--lr-color-surface-raised)] - Filled item background.
* @cssprop [--lr-accordion-item-filled-outlined-bg=var(--lr-color-surface-raised)] -
*   Filled-outlined item background.
* @cssprop [--lr-accordion-item-button-hover-bg=var(--lr-color-brand-quiet)] - Trigger hover
*   background.
* @cssprop [--lr-accordion-item-button-active-bg=color-mix(...)] - Trigger pressed background.
* @cssprop [--lr-accordion-item-spacing=var(--lr-form-control-padding-inline)] - Header/content
*   spacing.
* @cssprop [--lr-accordion-item-show-duration=var(--lr-duration-base)] - Expand transition
*   duration.
* @cssprop [--lr-accordion-item-hide-duration=var(--lr-duration-base)] - Collapse transition
*   duration.
* @cssprop [--lr-accordion-item-easing=var(--lr-easing-standard)] - Expand/collapse easing.
* @cssprop [--spacing] - Upstream-compatible alias for `--lr-accordion-item-spacing`.
* @cssprop [--show-duration] - Upstream-compatible alias for
*   `--lr-accordion-item-show-duration`.
* @cssprop [--hide-duration] - Upstream-compatible alias for
*   `--lr-accordion-item-hide-duration`.
* @cssprop [--easing] - Upstream-compatible alias for `--lr-accordion-item-easing`.
* @cssstate animating - Present while an expand/collapse transition is settling.
* @status stable
* @since 4.0.0
*/
export declare class LyraAccordionItem extends LyraElement{static styles:import("lit").CSSResultGroup[];private readonly itemInternals;private readonly disclosureMotion;private _expanded;private hasLabel;constructor();
/** Text shown in the trigger. Rich content belongs in the `label` slot. */
label:string;
/**
* Whether the panel is expanded. Assigning it uses the owning accordion's cancelable lifecycle.
* @default false
*/
get expanded():boolean;set expanded(next:boolean);
/** Disables the item so it cannot be toggled. */
disabled:boolean;
/** Heading level from 1–6, or `none`; every other value uses h3. */
headingLevel:LyraAccordionHeadingLevel;
/** Whether the icon appears before or after the label. */
iconPlacement:LyraAccordionIconPlacement;
/** Visual treatment inherited non-destructively from the owning accordion. */
appearance:LyraAccordionAppearance;disconnectedCallback():void;protected willUpdate(changed:PropertyValues<this>):void;protected updated(changed:PropertyValues<this>):void;private applyExpandedState;private syncExpandedAttribute;private transitionTo;
/** Expands the accordion item with animation. Disabled or expanded items are unchanged. */
expand():Promise<void>;
/** Collapses the accordion item with animation. Disabled or collapsed items are unchanged. */
collapse():Promise<void>;
/** Toggles the accordion item's expanded state. */
toggle():Promise<void>;
/** Focus the internal trigger. */
focus(options?:FocusOptions):void;
/** Activate the internal trigger. */
click():void;private get button();private onTrigger;private onLabel;private heading;private get effectiveAppearance();private get effectiveHeadingLevel();private get effectiveIconPlacement();render():TemplateResult;}declare global{interface HTMLElementTagNameMap{'lr-accordion-item':LyraAccordionItem;}}