t')
                scriptEl.setAttribute('type', 'module')
                // send ok in the module script to ensure sequential evaluation
                // of multiple proxy.eval() calls
                const done = new Promise((resolve) => {
                  window.__next__ = resolve
                })
                scriptEl.innerHTML = script + `\nwindow.__next__()`
                document.head.appendChild(scriptEl)
                scriptEl.onerror = (err) => send_error(err.message, err.stack)
    