export declare const placements: readonly ["bottom-left", "bottom-center", "bottom-right"];
export type Placement = (typeof placements)[number];
export declare function isValidPlacement(value: string): value is Placement;
export declare class DevToolbarWindow extends HTMLElement {
    shadowRoot: ShadowRoot;
    _placement: Placement;
    get placement(): "bottom-left" | "bottom-center" | "bottom-right";
    set placement(value: "bottom-left" | "bottom-center" | "bottom-right");
    static observedAttributes: string[];
    constructor();
    connectedCallback(): Promise<void>;
    attributeChangedCallback(): void;
    updateStyle(): void;
}