/**
 * Read an HTML attribute via `element.getAttribute(name)`.
 *
 * Sentinel returns:
 * - `Element not found: <selector>` when the selector matches nothing
 * - `Attribute not found: <name>` when the element has no such attribute
 *
 * Distinguishing these from a literal empty-string attribute lets callers
 * tell "missing" apart from "present but blank".
 */
export declare const queryAttributeBySelector: import("../types").CommandModule;