import { LitElement, nothing, type PropertyValues } from 'lit';
/**
 * @element nve-viewport-gridlines
 * @description Renders origin-stable, zoom-adaptive gridlines behind viewport content.
 * @documentation https://nvidia.github.io/elements/docs/elements/viewport/
 * @since 0.0.0
 * @entrypoint \@nvidia-elements/core/viewport
 * @cssprop --color - Sets the gridline stroke color.
 * @cssprop --line-width - Sets the approximate stroke width in CSS pixels.
 */
export declare class ViewportGridlines extends LitElement {
    #private;
    static styles: import("lit").CSSResult[];
    static readonly metadata: {
        tag: string;
        version: string;
    };
    /** @private */
    slot: string;
    /** @private */
    protected accessibilityHidden: string;
    /** Smallest gridline interval in content-space units. */
    get step(): number;
    set step(value: number);
    /** Content-space x coordinate of the grid origin. */
    get originX(): number;
    set originX(value: number);
    /** Content-space y coordinate of the grid origin. */
    get originY(): number;
    set originY(value: number);
    /** Target on-screen separation used to choose the adaptive gridline interval, in CSS pixels. */
    get targetSpacing(): number;
    set targetSpacing(value: number);
    connectedCallback(): void;
    disconnectedCallback(): void;
    protected willUpdate(changed: PropertyValues<this>): void;
    render(): typeof nothing | import("lit-html").TemplateResult<1>;
}