/**
 * Test whether an element is visually rendered.
 *
 * "Visible" here means all of:
 * - It exists in the DOM
 * - Its bounding rect has non-zero width and height
 * - `getComputedStyle` reports `display !== 'none'`
 * - `visibility !== 'hidden'` and `visibility !== 'collapse'`
 * - `opacity > 0`
 *
 * Returns the string `'true'` or `'false'` (the MCP response format is plain
 * text, so callers compare against the literal string).
 *
 * Sentinel: `Element not found: <selector>` when the selector matches nothing.
 */
export declare const queryVisibleBySelector: import("../types").CommandModule;