/**
 * Component debug overlay.
 *
 * `jqhtml.debug_overlay.enable()` turns the page into an inspector: hovering
 * any element outlines the component under the pointer and every component
 * above it, each with a small tab naming the component and its simple args;
 * clicking opens a modal describing the innermost component (identity, args,
 * data, state, ancestry, instantiator) instead of firing the click. Alt+click
 * passes through. `disable()` puts everything back.
 *
 * The labels are part of the interaction, not just decoration: the pointer can
 * move from a component onto one of its tabs without the hover set collapsing,
 * and clicking a tab inspects that tab's component. The modal keeps an amber
 * outline on whatever it is showing, and its title bar carries Parent / Back so
 * the DOM chain can be walked without going back to the page.
 *
 * Non-invasiveness, the design goal (details in ./CLAUDE.md):
 *   - The overlay's own UI lives in a shadow root on a host element appended to
 *     <body>, styled by shadow.scss. Page CSS cannot select into it and :host
 *     cuts inheritance, so its look is fixed whatever the page does.
 *   - The only thing added to application elements is a pair of classes,
 *     .jqhtml-debug-hit / .jqhtml-debug-depth-N, which light.scss paints as an
 *     inset outline (no layout effect) and only while <html data-jqhtml-debug>.
 *   - Listeners are attached on enable and removed on disable. The stylesheets
 *     and the (detached) host stay once installed: inert, and cheap to re-enable.
 *   - Nothing is registered per component, so components created after enable
 *     are covered automatically.
 */
export declare const debug_overlay: {
    /** Turn the overlay on. Returns false where there is no DOM (SSR). */
    enable(): boolean;
    /** Turn the overlay off. Styles stay installed but match nothing. */
    disable(): void;
    is_enabled(): boolean;
    /**
     * Open the modal for a component, an element inside one, or a jQuery
     * object, without needing a click. Handy from the console and from tests.
     */
    inspect(target: any): boolean;
};
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