discourse/app/assets/javascripts/activate-account.js

// discourse-skip-module
(function () {
  setTimeout(function () {
    const $activateButton = $("#activate-account-button");
    $activateButton.on("click", function () {
      $activateButton.prop("disabled", true);
      const hpPath = document.getElementById("data-activate-account").dataset
        .path;
      $.ajax(hpPath)
        .then(function (hp) {
          $("#password_confirmation").val(hp.value);
          $("#challenge").val(hp.challenge.split("").reverse().join(""));
          $("#activate-account-form").submit();
        })
        .fail(function () {
          $activateButton.prop("disabled", false);
        });
    });
  }, 50);
})();