ice.fo.utils/Clipboard/copyTextToClipboard.js

function fallbackCopyTextToClipboard(text) {
  const textArea = document.createElement('textarea');
  textArea.value = text;

  // Avoid scrolling to bottom
  textArea.style.top = '0';
  textArea.style.left = '0';
  textArea.style.position = 'fixed';

  document.body.appendChild(textArea);
  textArea.focus();
  textArea.select();

  document.execCommand('copy');

  document.body.removeChild(textArea);
}

export default function copyTextToClipboard(text) {
  return new Promise((resolve, reject) => {
    if (!navigator.clipboard) {
      try {
        fallbackCopyTextToClipboard(text);
        resolve();
      } catch (error) {
        reject(error);
      }
    }

    navigator.clipboard.writeText(text).then(resolve, reject);
  });
}