import { Strategy } from '../types';
/**
 * First strategy in the chain. Customer-controlled anchor selector via the
 * configured tracking attribute (default: `data-amp-track-id`).
 *
 * Semantics:
 *
 *   - Attribute set with a non-empty value:
 *       returns `[<attr>="<value>"]` — uses this element as an explicit anchor.
 *   - Attribute set with an empty value:
 *       returns null. The empty value is a suppression signal for downstream
 *       components (the `stableId` strategy and the fallback both consult
 *       `getStableId` which honors the empty-value semantic). This strategy
 *       doesn't anchor on the element either.
 *   - Attribute absent:
 *       returns null.
 *
 * The selector wraps the value in JSON-encoded quotes so any special CSS
 * characters in the value are escaped uniformly.
 */
export declare const explicitTrackingAttribute: Strategy;
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