modern-copy/dist/modern-copy.es.js

var copyTextToClipboard = function (input) {
	var el = document.createElement('textarea');

	el.value = input;

	// Prevent keyboard from showing on mobile
	el.setAttribute('readonly', '');

	el.style.contain = 'strict';
	el.style.position = 'absolute';
	el.style.left = '-9999px';
	el.style.fontSize = '12pt'; // Prevent zooming on iOS

	var selection = getSelection();
	var originalRange = false;
	if (selection.rangeCount > 0) {
		originalRange = selection.getRangeAt(0);
	}

	document.body.appendChild(el);
	el.select();

	// Explicit selection workaround for iOS
	el.selectionStart = 0;
	el.selectionEnd = input.length;

	var success = false;
	try {
		success = document.execCommand('copy');
	} catch (err) {}

	document.body.removeChild(el);

	if (originalRange) {
		selection.removeAllRanges();
		selection.addRange(originalRange);
	}

	return success;
};

export default copyTextToClipboard;