/**
 * The selector of an element as text, for a message. A string or a function selector
 * is shown as it is. The selector of a `custom$` or `custom$$` element is the strategy
 * reference, an object: it is shown by the strategy name, as `custom$(name)`, or
 * `custom$$(name)` for an item of a list. Another object (a mobile matcher, an element
 * reference) is shown as JSON.
 */
export declare function describeSelector(element: {
    selector?: unknown;
    index?: number;
}): string;
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