import type { ShellResponsiveMode } from '../../shell/shell-responsive';
import type { ShellPageCapacity, ShellPageContentInset, ShellPageContentSurface, ShellPageHeaderPresentation } from './shell-page-types';
export declare class ShellPage {
    private static readonly MAX_HEADER_REVEAL_FRAMES;
    private static readonly MAX_HEADER_GEOMETRY_FRAMES;
    el: HTMLElement;
    /** Automatic capacity/scroll behavior, or an explicit header variant override. */
    headerPresentation: ShellPageHeaderPresentation;
    /** Available page-header capacity supplied by the owning application shell. */
    headerCapacity?: ShellPageCapacity;
    /** Standard page gutters, or no inset for full-bleed page content. */
    contentInset: ShellPageContentInset;
    /** Preserve the responsive side/end gutters while allowing content to meet the header. */
    contentInsetBlockStart: ShellPageContentInset;
    /** Exact block-start content inset, overriding the responsive default when provided. */
    contentInsetBlockStartSize?: string;
    /** Exact block-start content inset while the header is compact or constrained. */
    compactContentInsetBlockStartSize?: string;
    /** Allow roomy automatic headers to compact as the page scrolls. */
    scrollCompaction: boolean;
    /** Canvas surface painted around and beneath routed page content. */
    contentSurface: ShellPageContentSurface;
    /** Explicit shell breakpoint presentation. Mobile uses the dedicated mobile-header slot. */
    responsiveMode: ShellResponsiveMode;
    private pageTopVisible;
    private sentinelEl;
    private spacerEl;
    private stickyHeaderEl;
    private headerEl;
    private expandedHeaderHeight;
    private headerTravel;
    private expandedGeometryFrozen;
    private pageHeaderResizeObserver;
    private headerResizeObserver;
    private headerMutationObserver;
    private headerRevealFrame;
    private headerGeometryFrame;
    private reconnectFrame;
    private scrollRoot;
    private hasLoaded;
    handleHeaderContractChange(): void;
    handleResponsiveModeChange(): void;
    componentDidLoad(): void;
    componentDidRender(): void;
    connectedCallback(): void;
    disconnectedCallback(): void;
    private connectRuntime;
    private get effectiveVariant();
    private get headerContractResolved();
    private get isScrollCompacted();
    private get contentInsetStyles();
    private composedParent;
    private findScrollRoot;
    private connectScrollRoot;
    private get scrollRootResolved();
    private handleScroll;
    private findHeader;
    private get compactHeaderHeight();
    private syncHeaderDividerInset;
    private setHeaderTravel;
    private measureHeaderTravel;
    private captureExpandedHeaderGeometry;
    private setSpacerHeight;
    private variantClass;
    private setStickyHeaderOffset;
    private syncPageHeaderBlockSize;
    private observePageHeaderGeometry;
    private syncRenderedHeaderGeometry;
    private cancelHeaderGeometrySync;
    private scheduleHeaderGeometrySync;
    private cancelHeaderReveal;
    private revealHeaderWhenSynced;
    private syncHeaderVariant;
    private observeHeader;
    private handleHeaderSlotChange;
    render(): any;
}
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