/**
 * Copies text to clipboard by creating an almost invisible textarea,
 * adding text there, then running execCommand('copy').
 * Falls back to prompt() when the easy way fails (hello, Safari!)
 * From http://stackoverflow.com/a/30810322
 *
 * @param {string} textToCopy
 * @param {string} fallbackString
 * @returns {Promise}
 */
export default function copyToClipboard(textToCopy: string, fallbackString?: string): Promise<void>;
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