hermes-agent/web/src/lib/clipboard.ts

export async function copyTextToClipboard(text: string): Promise<boolean> {
  const clipboard =
    typeof navigator === "undefined" ? undefined : navigator.clipboard;
  const secureContext =
    typeof window === "undefined" ? true : window.isSecureContext;
  if (secureContext && clipboard?.writeText) {
    try {
      await clipboard.writeText(text);
      return true;
    } catch {
      // Fall through to the selection-based copy path below.
    }
  }

  if (typeof document === "undefined") {
    return false;
  }

  const textarea = document.createElement("textarea");
  textarea.value = text;
  textarea.setAttribute("readonly", "");
  textarea.style.position = "fixed";
  textarea.style.top = "-1000px";
  textarea.style.left = "-1000px";
  textarea.style.opacity = "0";
  document.body.appendChild(textarea);

  const selection = document.getSelection();
  const ranges: Range[] = [];
  if (selection) {
    for (let i = 0; i < selection.rangeCount; i += 1) {
      ranges.push(selection.getRangeAt(i));
    }
  }

  textarea.focus();
  textarea.select();
  textarea.setSelectionRange(0, textarea.value.length);

  let copied = false;
  try {
    copied = document.execCommand("copy");
  } catch {
    copied = false;
  } finally {
    document.body.removeChild(textarea);
    if (selection) {
      selection.removeAllRanges();
      for (const range of ranges) {
        selection.addRange(range);
      }
    }
  }

  return copied;
}