/**
 * Take a break for a number of seconds.
 * @param seconds Number of seconds to wait.
 */
declare const sleep: (seconds: number) => Promise<void>;
declare const isNotDefined: (value: string | null | undefined) => boolean;
declare const firstOrUndefined: <T>(array: Array<T>) => T;
export { sleep, isNotDefined, firstOrUndefined };
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