/**
 * Returns a promise that resolves to a window client matching the passed
 * `resultingClientId`. For browsers that don't support `resultingClientId`
 * or if waiting for the resulting client to apper takes too long, resolve to
 * `undefined`.
 *
 * @param resultingClientId
 * @returns
 * @private
 */
export declare function resultingClientExists(resultingClientId?: string): Promise<Client | undefined>;
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