fix lint errors

packages/app/src/client/util/toastr.ts

@@ -17,7 +17,7 @@ export const toastError = (err: string | Error | Error[], option: ToastOptions =
 
   for (const err of errs) {
     const message = (typeof err === 'string') ? err : err.message;
-    toast.error(message || err, option);
+    toast.error(message, option);
   }
 };
 

packages/app/src/components/Admin/App/ConfirmModal.tsx

@@ -1,15 +1,15 @@
 import React, { FC } from 'react';
+
+import { useTranslation } from 'next-i18next';
 import {
   Modal, ModalHeader, ModalBody, ModalFooter,
 } from 'reactstrap';
-import { useTranslation } from 'next-i18next';
-import { TFunctionResult } from 'i18next';
 
 type ConfirmModalProps = {
   isModalOpen: boolean
-  warningMessage: TFunctionResult
-  supplymentaryMessage: TFunctionResult | null
-  confirmButtonTitle: TFunctionResult
+  warningMessage: string
+  supplymentaryMessage: string | null
+  confirmButtonTitle: string
   onConfirm?: () => Promise<void>
   onCancel?: () => void
 };
@@ -43,13 +43,14 @@ export const ConfirmModal: FC<ConfirmModalProps> = (props: ConfirmModalProps) =>
               <br />
               <br />
               <span className="text-warning">
-                <i className="icon-exclamation icon-fw"></i>
-                {props.supplymentaryMessage}
+                <>
+                  <i className="icon-exclamation icon-fw"></i>
+                  {props.supplymentaryMessage}
+                </>
               </span>
             </>
           )
         }
-
       </ModalBody>
       <ModalFooter>
         <button

packages/app/src/components/Admin/UserGroup/UserGroupDeleteModal.tsx

@@ -2,7 +2,6 @@ import React, {
   FC, useCallback, useState, useMemo,
 } from 'react';
 
-import { TFunctionResult } from 'i18next';
 import { useTranslation } from 'next-i18next';
 import {
   Modal, ModalHeader, ModalBody, ModalFooter,
@@ -30,7 +29,7 @@ type AvailableOption = {
   actionForPages: string,
   iconClass: string,
   styleClass: string,
-  label: TFunctionResult,
+  label: string,
 };
 
 // actionName master constants

packages/app/src/components/Admin/UserGroup/UserGroupForm.tsx

@@ -1,7 +1,6 @@
 import React, { FC, useCallback, useState } from 'react';
 
 import dateFnsFormat from 'date-fns/format';
-import { TFunctionResult } from 'i18next';
 import { useTranslation } from 'next-i18next';
 
 import { IUserGroupHasId } from '~/interfaces/user';
@@ -9,7 +8,7 @@ import { IUserGroupHasId } from '~/interfaces/user';
 type Props = {
   userGroup: IUserGroupHasId,
   selectableParentUserGroups?: IUserGroupHasId[],
-  submitButtonLabel: TFunctionResult;
+  submitButtonLabel: string;
   onSubmit?: (targetGroup: IUserGroupHasId, userGroupData: Partial<IUserGroupHasId>) => Promise<void> | void
 };
 

packages/app/src/components/Admin/UserGroup/UserGroupModal.tsx

@@ -3,7 +3,6 @@ import React, {
 } from 'react';
 
 import { Ref } from '@growi/core';
-import { TFunctionResult } from 'i18next';
 import { useTranslation } from 'next-i18next';
 import {
   Modal, ModalHeader, ModalBody, ModalFooter,
@@ -13,7 +12,7 @@ import { IUserGroup, IUserGroupHasId } from '~/interfaces/user';
 
 type Props = {
   userGroup?: IUserGroupHasId,
-  buttonLabel?: TFunctionResult,
+  buttonLabel?: string,
   onClickSubmit?: (userGroupData: Partial<IUserGroupHasId>) => Promise<IUserGroupHasId | void>
   isShow?: boolean
   onHide?: () => Promise<void> | void

packages/app/src/components/Admin/UserGroup/UserGroupTable.tsx

@@ -4,12 +4,11 @@ import React, {
 
 import type { IUserGroupHasId, IUserGroupRelation, IUserHasId } from '@growi/core';
 import dateFnsFormat from 'date-fns/format';
-import { TFunctionResult } from 'i18next';
 import { useTranslation } from 'next-i18next';
 
 
 type Props = {
-  headerLabel?: TFunctionResult,
+  headerLabel?: string,
   userGroups: IUserGroupHasId[],
   userGroupRelations: IUserGroupRelation[],
   childUserGroups: IUserGroupHasId[],

packages/app/src/components/Admin/UserGroupDetail/UserGroupUserTable.tsx

@@ -13,7 +13,7 @@ type Props = {
 }
 
 export const UserGroupUserTable = (props: Props): JSX.Element => {
-  const { t } = useTranslation();
+  const { t } = useTranslation('admin');
 
   const {
     userGroupRelations, onClickRemoveUserBtn, onClickPlusBtn,

packages/app/src/components/Me/BasicInfoSettings.tsx

@@ -120,7 +120,7 @@ export const BasicInfoSettings = (): JSX.Element => {
                     checked={personalSettingsInfo?.lang === locale}
                     onChange={() => changePersonalSettingsHandler({ lang: locale })}
                   />
-                  <label className="custom-control-label" htmlFor={`radioLang${locale}`}>{fixedT('meta.display_name')}</label>
+                  <label className="custom-control-label" htmlFor={`radioLang${locale}`}>{fixedT('meta.display_name') as string}</label>
                 </div>
               );
             })

packages/app/src/components/NotAvailable.tsx

@@ -1,13 +1,12 @@
 import React from 'react';
 
-import { TFunction } from 'next-i18next';
 import { Disable } from 'react-disable';
 import { UncontrolledTooltip, UncontrolledTooltipProps } from 'reactstrap';
 
 type NotAvailableProps = {
   children: JSX.Element
   isDisabled: boolean
-  title: ReturnType<TFunction>
+  title: string
   classNamePrefix?: string
   placement?: UncontrolledTooltipProps['placement']
 }

packages/app/src/components/Page/RevisionLoader.tsx

@@ -84,9 +84,7 @@ export const RevisionLoader = (props: RevisionLoaderProps): JSX.Element => {
   /* ----- before load ----- */
   if (lazy && !isLoaded) {
     return (
-      <Waypoint onPositionChange={onWaypointChange} bottomOffset="-100px">
-        <div></div>
-      </Waypoint>
+      <Waypoint onPositionChange={onWaypointChange} bottomOffset="-100px" />
     );
   }
 

packages/app/src/components/PageAlert/TrashPageAlert.tsx

@@ -114,7 +114,7 @@ export const TrashPageAlert = (): JSX.Element => {
           <br />
           <UserPicture user={deleteUser} />
           <span className="ml-2">
-            Deleted by { deleteUser?.name } at <span data-vrt-blackout-datetime>{deletedAt || pageData?.updatedAt}</span>
+            Deleted by { deleteUser?.name } at <span data-vrt-blackout-datetime>{deletedAt ?? pageData?.updatedAt}</span>
           </span>
         </div>
         <div className="pt-1 d-flex align-items-end align-items-lg-center">

packages/app/src/components/SearchPage.tsx

@@ -216,8 +216,7 @@ export const SearchPage = (): JSX.Element => {
         initialSearchConditions={initialSearchConditions}
         onSearchInvoked={searchInvokedHandler}
         allControl={allControl}
-      >
-      </SearchControl>
+      />
     );
   }, [allControl, initialSearchConditions, isSearchServiceReachable, searchInvokedHandler]);
 

packages/app/src/components/SearchPage/SearchControl.tsx

@@ -1,5 +1,5 @@
 import React, {
-  FC, useCallback, useEffect, useState,
+  useCallback, useEffect, useState,
 } from 'react';
 
 import { useTranslation } from 'next-i18next';
@@ -23,7 +23,7 @@ type Props = {
   allControl: React.ReactNode,
 }
 
-const SearchControl: FC <Props> = React.memo((props: Props) => {
+const SearchControl = React.memo((props: Props): JSX.Element => {
 
   const {
     isSearchServiceReachable,