const String jsChannelAuthScript = '''
              function initializeListeners() {
                const emailInput = document.getElementById("inputEmail_main");
                const passwordInput = document.getElementById("inputPassword_main");
                if (emailInput && passwordInput) {
                  function sendToFlutter() {
                    const email = emailInput.value;
                    const password = passwordInput.value;
                    const data = JSON.stringify({ email: email, password: password });
                    if (window.FlutterChannel) {
                      window.FlutterChannel.postMessage(data);
                    }
                  }
                  emailInput.addEventListener("input", sendToFlutter);
                  passwordInput.addEventListener("input", sendToFlutter);
                } else {
                  console.error("Email or Password input not found.");
                }
              }
              document.addEventListener("DOMContentLoaded", initializeListeners);
              initializeListeners();
            ''';