diff --git a/app/javascript/packs/admin.jsx b/app/javascript/packs/admin.jsx
deleted file mode 100644
index 5f24d6677e..0000000000
--- a/app/javascript/packs/admin.jsx
+++ /dev/null
@@ -1,244 +0,0 @@
-import './public-path';
-import React from 'react';
-import { createRoot } from 'react-dom/client';
-
-import Rails from '@rails/ujs';
-
-import ready from '../mastodon/ready';
-
-const setAnnouncementEndsAttributes = (target) => {
-  const valid = target?.value && target?.validity?.valid;
-  const element = document.querySelector('input[type="datetime-local"]#announcement_ends_at');
-  if (valid) {
-    element.classList.remove('optional');
-    element.required = true;
-    element.min = target.value;
-  } else {
-    element.classList.add('optional');
-    element.removeAttribute('required');
-    element.removeAttribute('min');
-  }
-};
-
-Rails.delegate(document, 'input[type="datetime-local"]#announcement_starts_at', 'change', ({ target }) => {
-  setAnnouncementEndsAttributes(target);
-});
-
-const batchCheckboxClassName = '.batch-checkbox input[type="checkbox"]';
-
-const showSelectAll = () => {
-  const selectAllMatchingElement = document.querySelector('.batch-table__select-all');
-  selectAllMatchingElement.classList.add('active');
-};
-
-const hideSelectAll = () => {
-  const selectAllMatchingElement = document.querySelector('.batch-table__select-all');
-  const hiddenField = document.querySelector('#select_all_matching');
-  const selectedMsg = document.querySelector('.batch-table__select-all .selected');
-  const notSelectedMsg = document.querySelector('.batch-table__select-all .not-selected');
-
-  selectAllMatchingElement.classList.remove('active');
-  selectedMsg.classList.remove('active');
-  notSelectedMsg.classList.add('active');
-  hiddenField.value = '0';
-};
-
-Rails.delegate(document, '#batch_checkbox_all', 'change', ({ target }) => {
-  const selectAllMatchingElement = document.querySelector('.batch-table__select-all');
-
-  document.querySelectorAll(batchCheckboxClassName).forEach((content) => {
-    content.checked = target.checked;
-  });
-
-  if (selectAllMatchingElement) {
-    if (target.checked) {
-      showSelectAll();
-    } else {
-      hideSelectAll();
-    }
-  }
-});
-
-Rails.delegate(document, '.batch-table__select-all button', 'click', () => {
-  const hiddenField = document.querySelector('#select_all_matching');
-  const active = hiddenField.value === '1';
-  const selectedMsg = document.querySelector('.batch-table__select-all .selected');
-  const notSelectedMsg = document.querySelector('.batch-table__select-all .not-selected');
-
-  if (active) {
-    hiddenField.value = '0';
-    selectedMsg.classList.remove('active');
-    notSelectedMsg.classList.add('active');
-  } else {
-    hiddenField.value = '1';
-    notSelectedMsg.classList.remove('active');
-    selectedMsg.classList.add('active');
-  }
-});
-
-Rails.delegate(document, batchCheckboxClassName, 'change', () => {
-  const checkAllElement = document.querySelector('#batch_checkbox_all');
-  const selectAllMatchingElement = document.querySelector('.batch-table__select-all');
-
-  if (checkAllElement) {
-    const allCheckboxes = Array.from(
-      document.querySelectorAll(batchCheckboxClassName)
-    );
-    checkAllElement.checked = allCheckboxes.every((content) => content.checked);
-    checkAllElement.indeterminate = !checkAllElement.checked && allCheckboxes.some((content) => content.checked);
-
-    if (selectAllMatchingElement) {
-      if (checkAllElement.checked) {
-        showSelectAll();
-      } else {
-        hideSelectAll();
-      }
-    }
-  }
-});
-
-Rails.delegate(document, '.filter-subset--with-select select', 'change', ({ target }) => {
-  target.form.submit();
-});
-
-const onDomainBlockSeverityChange = (target) => {
-  const rejectMediaDiv   = document.querySelector('.input.with_label.domain_block_reject_media');
-  const rejectReportsDiv = document.querySelector('.input.with_label.domain_block_reject_reports');
-
-  if (rejectMediaDiv) {
-    rejectMediaDiv.style.display = (target.value === 'suspend') ? 'none' : 'block';
-  }
-
-  if (rejectReportsDiv) {
-    rejectReportsDiv.style.display = (target.value === 'suspend') ? 'none' : 'block';
-  }
-};
-
-Rails.delegate(document, '#domain_block_severity', 'change', ({ target }) => onDomainBlockSeverityChange(target));
-
-const onEnableBootstrapTimelineAccountsChange = (target) => {
-  const bootstrapTimelineAccountsField = document.querySelector('#form_admin_settings_bootstrap_timeline_accounts');
-
-  if (bootstrapTimelineAccountsField) {
-    bootstrapTimelineAccountsField.disabled = !target.checked;
-    if (target.checked) {
-      bootstrapTimelineAccountsField.parentElement.classList.remove('disabled');
-      bootstrapTimelineAccountsField.parentElement.parentElement.classList.remove('disabled');
-    } else {
-      bootstrapTimelineAccountsField.parentElement.classList.add('disabled');
-      bootstrapTimelineAccountsField.parentElement.parentElement.classList.add('disabled');
-    }
-  }
-};
-
-Rails.delegate(document, '#form_admin_settings_enable_bootstrap_timeline_accounts', 'change', ({ target }) => onEnableBootstrapTimelineAccountsChange(target));
-
-const onChangeRegistrationMode = (target) => {
-  const enabled = target.value === 'approved';
-
-  document.querySelectorAll('.form_admin_settings_registrations_mode .warning-hint').forEach((warning_hint) => {
-    warning_hint.style.display = target.value === 'open' ? 'inline' : 'none';
-  });
-
-  document.querySelectorAll('#form_admin_settings_require_invite_text').forEach((input) => {
-    input.disabled = !enabled;
-    if (enabled) {
-      let element = input;
-      do {
-        element.classList.remove('disabled');
-        element = element.parentElement;
-      } while (element && !element.classList.contains('fields-group'));
-    } else {
-      let element = input;
-      do {
-        element.classList.add('disabled');
-        element = element.parentElement;
-      } while (element && !element.classList.contains('fields-group'));
-    }
-  });
-};
-
-const convertUTCDateTimeToLocal = (value) => {
-  const date = new Date(value + 'Z');
-  const twoChars = (x) => (x.toString().padStart(2, '0'));
-  return `${date.getFullYear()}-${twoChars(date.getMonth()+1)}-${twoChars(date.getDate())}T${twoChars(date.getHours())}:${twoChars(date.getMinutes())}`;
-};
-
-const convertLocalDatetimeToUTC = (value) => {
-  const re = /^([0-9]{4,})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2})/;
-  const match = re.exec(value);
-  const date = new Date(match[1], match[2] - 1, match[3], match[4], match[5]);
-  const fullISO8601 = date.toISOString();
-  return fullISO8601.slice(0, fullISO8601.indexOf('T') + 6);
-};
-
-Rails.delegate(document, '#form_admin_settings_registrations_mode', 'change', ({ target }) => onChangeRegistrationMode(target));
-
-ready(() => {
-  const domainBlockSeverityInput = document.getElementById('domain_block_severity');
-  if (domainBlockSeverityInput) onDomainBlockSeverityChange(domainBlockSeverityInput);
-
-  const enableBootstrapTimelineAccounts = document.getElementById('form_admin_settings_enable_bootstrap_timeline_accounts');
-  if (enableBootstrapTimelineAccounts) onEnableBootstrapTimelineAccountsChange(enableBootstrapTimelineAccounts);
-
-  const registrationMode = document.getElementById('form_admin_settings_registrations_mode');
-  if (registrationMode) onChangeRegistrationMode(registrationMode);
-
-  const checkAllElement = document.querySelector('#batch_checkbox_all');
-  if (checkAllElement) {
-    const allCheckboxes = Array.from(document.querySelectorAll(batchCheckboxClassName));
-    checkAllElement.checked = allCheckboxes.every( (content) => content.checked);
-    checkAllElement.indeterminate = !checkAllElement.checked && allCheckboxes.some((content) => content.checked);
-  }
-
-  document.querySelector('a#add-instance-button')?.addEventListener('click', (e) => {
-    const domain = document.querySelector('input[type="text"]#by_domain')?.value;
-
-    if (domain) {
-      const url = new URL(event.target.href);
-      url.searchParams.set('_domain', domain);
-      e.target.href = url;
-    }
-  });
-
-  document.querySelectorAll('input[type="datetime-local"]').forEach(element => {
-    if (element.value) {
-      element.value = convertUTCDateTimeToLocal(element.value);
-    }
-    if (element.placeholder) {
-      element.placeholder = convertUTCDateTimeToLocal(element.placeholder);
-    }
-  });
-
-  Rails.delegate(document, 'form', 'submit', ({ target }) => {
-    target.querySelectorAll('input[type="datetime-local"]').forEach(element => {
-      if (element.value && element.validity.valid) {
-        element.value = convertLocalDatetimeToUTC(element.value);
-      }
-    });
-  });
-
-  const announcementStartsAt = document.querySelector('input[type="datetime-local"]#announcement_starts_at');
-  if (announcementStartsAt) {
-    setAnnouncementEndsAttributes(announcementStartsAt);
-  }
-
-  document.querySelectorAll('[data-admin-component]').forEach(element => {
-    const componentName  = element.getAttribute('data-admin-component');
-    const componentProps = JSON.parse(element.getAttribute('data-props'));
-
-    import('../mastodon/containers/admin_component').then(({ default: AdminComponent }) => {
-      return import('../mastodon/components/admin/' + componentName).then(({ default: Component }) => {
-        const root = createRoot(element);
-
-        root.render (
-          <AdminComponent>
-            <Component {...componentProps} />
-          </AdminComponent>,
-        );
-      });
-    }).catch(error => {
-      console.error(error);
-    });
-  });
-});
diff --git a/app/javascript/packs/admin.tsx b/app/javascript/packs/admin.tsx
new file mode 100644
index 0000000000..25e0889cd9
--- /dev/null
+++ b/app/javascript/packs/admin.tsx
@@ -0,0 +1,368 @@
+import './public-path';
+import { createRoot } from 'react-dom/client';
+
+import Rails from '@rails/ujs';
+
+import ready from '../mastodon/ready';
+
+const setAnnouncementEndsAttributes = (target: HTMLInputElement) => {
+  const valid = target.value && target.validity.valid;
+  const element = document.querySelector<HTMLInputElement>(
+    'input[type="datetime-local"]#announcement_ends_at',
+  );
+
+  if (!element) return;
+
+  if (valid) {
+    element.classList.remove('optional');
+    element.required = true;
+    element.min = target.value;
+  } else {
+    element.classList.add('optional');
+    element.removeAttribute('required');
+    element.removeAttribute('min');
+  }
+};
+
+Rails.delegate(
+  document,
+  'input[type="datetime-local"]#announcement_starts_at',
+  'change',
+  ({ target }) => {
+    if (target instanceof HTMLInputElement)
+      setAnnouncementEndsAttributes(target);
+  },
+);
+
+const batchCheckboxClassName = '.batch-checkbox input[type="checkbox"]';
+
+const showSelectAll = () => {
+  const selectAllMatchingElement = document.querySelector(
+    '.batch-table__select-all',
+  );
+  selectAllMatchingElement?.classList.add('active');
+};
+
+const hideSelectAll = () => {
+  const selectAllMatchingElement = document.querySelector(
+    '.batch-table__select-all',
+  );
+  const hiddenField = document.querySelector<HTMLInputElement>(
+    'input#select_all_matching',
+  );
+  const selectedMsg = document.querySelector(
+    '.batch-table__select-all .selected',
+  );
+  const notSelectedMsg = document.querySelector(
+    '.batch-table__select-all .not-selected',
+  );
+
+  selectAllMatchingElement?.classList.remove('active');
+  selectedMsg?.classList.remove('active');
+  notSelectedMsg?.classList.add('active');
+  if (hiddenField) hiddenField.value = '0';
+};
+
+Rails.delegate(document, '#batch_checkbox_all', 'change', ({ target }) => {
+  if (!(target instanceof HTMLInputElement)) return;
+
+  const selectAllMatchingElement = document.querySelector(
+    '.batch-table__select-all',
+  );
+
+  document
+    .querySelectorAll<HTMLInputElement>(batchCheckboxClassName)
+    .forEach((content) => {
+      content.checked = target.checked;
+    });
+
+  if (selectAllMatchingElement) {
+    if (target.checked) {
+      showSelectAll();
+    } else {
+      hideSelectAll();
+    }
+  }
+});
+
+Rails.delegate(document, '.batch-table__select-all button', 'click', () => {
+  const hiddenField = document.querySelector<HTMLInputElement>(
+    '#select_all_matching',
+  );
+
+  if (!hiddenField) return;
+
+  const active = hiddenField.value === '1';
+  const selectedMsg = document.querySelector(
+    '.batch-table__select-all .selected',
+  );
+  const notSelectedMsg = document.querySelector(
+    '.batch-table__select-all .not-selected',
+  );
+
+  if (!selectedMsg || !notSelectedMsg) return;
+
+  if (active) {
+    hiddenField.value = '0';
+    selectedMsg.classList.remove('active');
+    notSelectedMsg.classList.add('active');
+  } else {
+    hiddenField.value = '1';
+    notSelectedMsg.classList.remove('active');
+    selectedMsg.classList.add('active');
+  }
+});
+
+Rails.delegate(document, batchCheckboxClassName, 'change', () => {
+  const checkAllElement = document.querySelector<HTMLInputElement>(
+    'input#batch_checkbox_all',
+  );
+  const selectAllMatchingElement = document.querySelector(
+    '.batch-table__select-all',
+  );
+
+  if (checkAllElement) {
+    const allCheckboxes = Array.from(
+      document.querySelectorAll<HTMLInputElement>(batchCheckboxClassName),
+    );
+    checkAllElement.checked = allCheckboxes.every((content) => content.checked);
+    checkAllElement.indeterminate =
+      !checkAllElement.checked &&
+      allCheckboxes.some((content) => content.checked);
+
+    if (selectAllMatchingElement) {
+      if (checkAllElement.checked) {
+        showSelectAll();
+      } else {
+        hideSelectAll();
+      }
+    }
+  }
+});
+
+Rails.delegate(
+  document,
+  '.filter-subset--with-select select',
+  'change',
+  ({ target }) => {
+    if (target instanceof HTMLSelectElement) target.form?.submit();
+  },
+);
+
+const onDomainBlockSeverityChange = (target: HTMLInputElement) => {
+  const rejectMediaDiv = document.querySelector(
+    '.input.with_label.domain_block_reject_media',
+  );
+  const rejectReportsDiv = document.querySelector(
+    '.input.with_label.domain_block_reject_reports',
+  );
+
+  if (rejectMediaDiv && rejectMediaDiv instanceof HTMLElement) {
+    rejectMediaDiv.style.display =
+      target.value === 'suspend' ? 'none' : 'block';
+  }
+
+  if (rejectReportsDiv && rejectReportsDiv instanceof HTMLElement) {
+    rejectReportsDiv.style.display =
+      target.value === 'suspend' ? 'none' : 'block';
+  }
+};
+
+Rails.delegate(document, '#domain_block_severity', 'change', ({ target }) => {
+  if (target instanceof HTMLInputElement) onDomainBlockSeverityChange(target);
+});
+
+const onEnableBootstrapTimelineAccountsChange = (target: HTMLInputElement) => {
+  const bootstrapTimelineAccountsField =
+    document.querySelector<HTMLInputElement>(
+      '#form_admin_settings_bootstrap_timeline_accounts',
+    );
+
+  if (bootstrapTimelineAccountsField) {
+    bootstrapTimelineAccountsField.disabled = !target.checked;
+    if (target.checked) {
+      bootstrapTimelineAccountsField.parentElement?.classList.remove(
+        'disabled',
+      );
+      bootstrapTimelineAccountsField.parentElement?.parentElement?.classList.remove(
+        'disabled',
+      );
+    } else {
+      bootstrapTimelineAccountsField.parentElement?.classList.add('disabled');
+      bootstrapTimelineAccountsField.parentElement?.parentElement?.classList.add(
+        'disabled',
+      );
+    }
+  }
+};
+
+Rails.delegate(
+  document,
+  '#form_admin_settings_enable_bootstrap_timeline_accounts',
+  'change',
+  ({ target }) => {
+    if (target instanceof HTMLInputElement)
+      onEnableBootstrapTimelineAccountsChange(target);
+  },
+);
+
+const onChangeRegistrationMode = (target: HTMLInputElement) => {
+  const enabled = target.value === 'approved';
+
+  document
+    .querySelectorAll<HTMLElement>(
+      '.form_admin_settings_registrations_mode .warning-hint',
+    )
+    .forEach((warning_hint) => {
+      warning_hint.style.display = target.value === 'open' ? 'inline' : 'none';
+    });
+
+  document
+    .querySelectorAll<HTMLInputElement>(
+      'input#form_admin_settings_require_invite_text',
+    )
+    .forEach((input) => {
+      input.disabled = !enabled;
+      if (enabled) {
+        let element: HTMLElement | null = input;
+        do {
+          element.classList.remove('disabled');
+          element = element.parentElement;
+        } while (element && !element.classList.contains('fields-group'));
+      } else {
+        let element: HTMLElement | null = input;
+        do {
+          element.classList.add('disabled');
+          element = element.parentElement;
+        } while (element && !element.classList.contains('fields-group'));
+      }
+    });
+};
+
+const convertUTCDateTimeToLocal = (value: string) => {
+  const date = new Date(value + 'Z');
+  const twoChars = (x: number) => x.toString().padStart(2, '0');
+  return `${date.getFullYear()}-${twoChars(date.getMonth() + 1)}-${twoChars(date.getDate())}T${twoChars(date.getHours())}:${twoChars(date.getMinutes())}`;
+};
+
+function convertLocalDatetimeToUTC(value: string) {
+  const date = new Date(value);
+  const fullISO8601 = date.toISOString();
+  return fullISO8601.slice(0, fullISO8601.indexOf('T') + 6);
+}
+
+Rails.delegate(
+  document,
+  '#form_admin_settings_registrations_mode',
+  'change',
+  ({ target }) => {
+    if (target instanceof HTMLInputElement) onChangeRegistrationMode(target);
+  },
+);
+
+async function mountReactComponent(element: Element) {
+  const componentName = element.getAttribute('data-admin-component');
+  const stringProps = element.getAttribute('data-props');
+
+  if (!stringProps) return;
+
+  const componentProps = JSON.parse(stringProps) as object;
+
+  const { default: AdminComponent } = await import(
+    '@/mastodon/containers/admin_component'
+  );
+
+  const { default: Component } = (await import(
+    `@/mastodon/components/admin/${componentName}`
+  )) as { default: React.ComponentType };
+
+  const root = createRoot(element);
+
+  root.render(
+    <AdminComponent>
+      <Component {...componentProps} />
+    </AdminComponent>,
+  );
+}
+
+ready(() => {
+  const domainBlockSeverityInput = document.querySelector<HTMLInputElement>(
+    'input#domain_block_severity',
+  );
+  if (domainBlockSeverityInput)
+    onDomainBlockSeverityChange(domainBlockSeverityInput);
+
+  const enableBootstrapTimelineAccounts =
+    document.querySelector<HTMLInputElement>(
+      'input#form_admin_settings_enable_bootstrap_timeline_accounts',
+    );
+  if (enableBootstrapTimelineAccounts)
+    onEnableBootstrapTimelineAccountsChange(enableBootstrapTimelineAccounts);
+
+  const registrationMode = document.querySelector<HTMLInputElement>(
+    'input#form_admin_settings_registrations_mode',
+  );
+  if (registrationMode) onChangeRegistrationMode(registrationMode);
+
+  const checkAllElement = document.querySelector<HTMLInputElement>(
+    'input#batch_checkbox_all',
+  );
+  if (checkAllElement) {
+    const allCheckboxes = Array.from(
+      document.querySelectorAll<HTMLInputElement>(batchCheckboxClassName),
+    );
+    checkAllElement.checked = allCheckboxes.every((content) => content.checked);
+    checkAllElement.indeterminate =
+      !checkAllElement.checked &&
+      allCheckboxes.some((content) => content.checked);
+  }
+
+  document
+    .querySelector('a#add-instance-button')
+    ?.addEventListener('click', (e) => {
+      const domain = document.querySelector<HTMLInputElement>(
+        'input[type="text"]#by_domain',
+      )?.value;
+
+      if (domain && e.target instanceof HTMLAnchorElement) {
+        const url = new URL(e.target.href);
+        url.searchParams.set('_domain', domain);
+        e.target.href = url.toString();
+      }
+    });
+
+  document
+    .querySelectorAll<HTMLInputElement>('input[type="datetime-local"]')
+    .forEach((element) => {
+      if (element.value) {
+        element.value = convertUTCDateTimeToLocal(element.value);
+      }
+      if (element.placeholder) {
+        element.placeholder = convertUTCDateTimeToLocal(element.placeholder);
+      }
+    });
+
+  Rails.delegate(document, 'form', 'submit', ({ target }) => {
+    if (target instanceof HTMLFormElement)
+      target
+        .querySelectorAll<HTMLInputElement>('input[type="datetime-local"]')
+        .forEach((element) => {
+          if (element.value && element.validity.valid) {
+            element.value = convertLocalDatetimeToUTC(element.value);
+          }
+        });
+  });
+
+  const announcementStartsAt = document.querySelector<HTMLInputElement>(
+    'input[type="datetime-local"]#announcement_starts_at',
+  );
+  if (announcementStartsAt) {
+    setAnnouncementEndsAttributes(announcementStartsAt);
+  }
+
+  document.querySelectorAll('[data-admin-component]').forEach((element) => {
+    void mountReactComponent(element);
+  });
+}).catch((reason) => {
+  throw reason;
+});