/**
 * A wrapper element that can collapse and expand to fit its content dynamically and efficiently.
 *
 * @category Collapsible
 * @category Elements
 * @see https://electrovir.github.io/vira/book/elements/vira-collapsible-wrapper
 */
export declare const ViraCollapsibleWrapper: import("element-vir").DeclarativeElementDefinition<`vira-${string}`, {
    expanded: boolean;
    /** When true, forces the content to expand when printing regardless of collapsed state. */
    expandOnPrint?: boolean;
}, {
    contentHeight: number;
    contentWidth: number;
    /**
     * Collapsed content that is merely `height: 0` is still rendered, so the browser emits
     * a line break for it when serializing a selection to plain text. Copying a region that
     * spans collapsed wrappers then pastes with runs of blank lines. Taking the content out
     * of layout entirely is what drops those breaks; `visibility: hidden` and `user-select:
     * none` both leave them behind.
     *
     * This starts `false` even when collapsed because the wrapper takes both its width and
     * its animation target height from the content, so the content has to be laid out once
     * before it can be hidden.
     */
    isContentHidden: boolean;
    collapsingElement: HTMLDivElement | undefined;
}, {
    expandChange: import("element-vir").DefineEvent<boolean>;
}, "vira-collapsible-wrapper-expand-on-print", `vira-${string}-`, readonly ["vira-collapsible-wrapper-header"], readonly []>;