diff --git a/client/src/App.tsx b/client/src/App.tsx
index ed8df66..1bb8b7f 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -24,7 +24,7 @@ import { useEasterEgg } from './context/eggs';
 import { getImage } from './api/EasterEggApi';
 import { Link } from 'react-router';
 import { STATS_URL } from './AppRoutes';
-import { ClientData, Food, PizzaOrder, DepartureTime, PizzaDayState, Restaurant, RestaurantDayMenu, RestaurantDayMenuMap, LunchChoice, LunchChoices, UserLunchChoice, PizzaVariant } from '../../types';
+import { ClientData, Food, PizzaOrder, DepartureTime, PizzaDayState, Restaurant, RestaurantDayMenu, RestaurantDayMenuMap, LunchChoice, UserLunchChoice, PizzaVariant } from '../../types';
 
 const EVENT_CONNECT = "connect"
 
@@ -41,7 +41,7 @@ const EASTER_EGG_DEFAULT_DURATION = 0.75;
 function App() {
   const auth = useAuth();
   const settings = useSettings();
-  const [easterEgg, easterEggLoading] = useEasterEgg(auth);
+  const [easterEgg, _] = useEasterEgg(auth);
   const [isConnected, setIsConnected] = useState<boolean>(false);
   const [data, setData] = useState<ClientData>();
   const [food, setFood] = useState<RestaurantDayMenuMap>();
@@ -65,7 +65,7 @@ function App() {
 
   // Načtení dat po přihlášení
   useEffect(() => {
-    if (!auth || !auth.login) {
+    if (!auth?.login) {
       return
     }
     getData().then(({ data }) => {
@@ -82,7 +82,7 @@ function App() {
 
   // Přenačtení pro zvolený den
   useEffect(() => {
-    if (!auth || !auth.login) {
+    if (!auth?.login) {
       return
     }
     getData(dayIndex).then((data: ClientData) => {
@@ -96,11 +96,9 @@ function App() {
   // Registrace socket eventů
   useEffect(() => {
     socket.on(EVENT_CONNECT, () => {
-      // console.log("Connected!");
       setIsConnected(true);
     });
     socket.on(EVENT_DISCONNECT, () => {
-      // console.log("Disconnected!");
       setIsConnected(false);
     });
     socket.on(EVENT_MESSAGE, (newData: ClientData) => {
@@ -119,7 +117,7 @@ function App() {
   }, [socket]);
 
   useEffect(() => {
-    if (!auth || !auth.login) {
+    if (!auth?.login) {
       return
     }
     // TODO tohle občas náhodně nezafunguje, nutno přepsat, viz https://medium.com/@teh_builder/ref-objects-inside-useeffect-hooks-eb7c15198780
@@ -277,7 +275,7 @@ function App() {
 
   const handlePizzaChange = async (value: SelectedOptionValue | SelectedOptionValue[]) => {
     if (auth?.login && data?.pizzaList) {
-      if (!(typeof value === 'string')) {
+      if (typeof value !== 'string') {
         throw Error('Nepodporovaný typ hodnoty');
       }
       const s = value.split('|');
@@ -365,13 +363,13 @@ function App() {
       content = <h3>Chyba načtení dat</h3>
     }
     return <Col md={12} lg={3} className='mt-3'>
-      <h3 style={{ cursor: 'pointer' }} onClick={() => doAddClickFoodChoice(location, undefined)}>{location}</h3>
+      <h3 style={{ cursor: 'pointer' }} onClick={() => doAddClickFoodChoice(location)}>{location}</h3>
       {menu?.lastUpdate && <small>Poslední aktualizace: {getHumanDateTime(new Date(menu.lastUpdate))}</small>}
       {content}
     </Col>
   }
 
-  if (!auth || !auth.login) {
+  if (!auth?.login) {
     return <Login />;
   }
 
@@ -411,8 +409,8 @@ function App() {
       <div className='wrapper'>
         {data.isWeekend ? <h4>Užívejte víkend :)</h4> : <>
           <Alert variant={'primary'}>
-            <img src='hat.png' style={{ position: "absolute", width: "70px", rotate: "-45deg", left: -40, top: -58 }} />
-            <img src='snowman.png' style={{ position: "absolute", height: "110px", right: 10, top: 5 }} />
+            <img alt="" src='hat.png' style={{ position: "absolute", width: "70px", rotate: "-45deg", left: -40, top: -58 }} />
+            <img alt="" src='snowman.png' style={{ position: "absolute", height: "110px", right: 10, top: 5 }} />
             Poslední změny:
             <ul>
               <li>Možnost výběru restaurace a jídel kliknutím v tabulce</li>
@@ -429,7 +427,6 @@ function App() {
           <Row className='food-tables'>
             {/* TODO zjednodušit, stačí iterovat klíče typu Restaurant */}
             {food['SLADOVNICKA'] && renderFoodTable('SLADOVNICKA', food['SLADOVNICKA'])}
-            {/* {food['UMOTLIKU'] && renderFoodTable('UMOTLIKU', food['UMOTLIKU'])} */}
             {food['TECHTOWER'] && renderFoodTable('TECHTOWER', food['TECHTOWER'])}
             {food['ZASTAVKAUMICHALA'] && renderFoodTable('ZASTAVKAUMICHALA', food['ZASTAVKAUMICHALA'])}
             {food['SENKSERIKOVA'] && renderFoodTable('SENKSERIKOVA', food['SENKSERIKOVA'])}
@@ -452,7 +449,7 @@ function App() {
                   <p style={{ marginTop: "10px" }}>Na co dobrého? <small>(nepovinné)</small></p>
                   <Form.Select ref={foodChoiceRef} onChange={doAddFoodChoice}>
                     <option></option>
-                    {foodChoiceList.map((food, index) => <option key={index} value={index}>{food.name}</option>)}
+                    {foodChoiceList.map((food, index) => <option key={food.name} value={index}>{food.name}</option>)}
                   </Form.Select>
                 </>}
                 {foodChoiceList && !closed && <>
@@ -491,7 +488,7 @@ function App() {
                                   const userPayload = entry[1];
                                   const userChoices = userPayload?.selectedFoods;
                                   const trusted = userPayload?.trusted || false;
-                                  return <tr key={index}>
+                                  return <tr key={entry[0]}>
                                     <td>
                                       {trusted && <span className='trusted-icon'>
                                         <FontAwesomeIcon title='Uživatel ověřený doménovým přihlášením' icon={faCircleCheck} style={{ cursor: "help" }} />
@@ -587,9 +584,6 @@ function App() {
                               <Button className='danger mb-3' title="Umožní znovu editovat objednávky." onClick={async () => {
                                 await unlockPizzaDay();
                               }}>Odemknout</Button>
-                              {/* <Button className='danger mb-3' style={{ marginLeft: '20px' }} onClick={async () => {
-                          await addToCart();
-                        }}>Přidat vše do košíku</Button> */}
                               <Button className='danger mb-3' style={{ marginLeft: '20px' }} title={noOrders ? "Nelze objednat - neexistuje žádná objednávka" : "Použij po objednání. Objednávky zůstanou zamčeny."} disabled={noOrders} onClick={async () => {
                                 await finishOrder();
                               }}>Objednáno</Button>
diff --git a/client/src/Login.tsx b/client/src/Login.tsx
index 8b178bf..af769a4 100644
--- a/client/src/Login.tsx
+++ b/client/src/Login.tsx
@@ -25,9 +25,8 @@ export default function Login() {
   }, [auth]);
 
   const doLogin = useCallback(async () => {
-    const length = loginRef?.current?.value && loginRef?.current?.value.length && loginRef.current.value.replace(/\s/g, '').length
+    const length = loginRef?.current?.value.length && loginRef.current.value.replace(/\s/g, '').length
     if (length) {
-      // TODO odchytávat cokoliv mimo 200
       const token = await login(loginRef.current?.value);
       if (token) {
         auth?.setToken(token);
@@ -35,7 +34,7 @@ export default function Login() {
     }
   }, [auth]);
 
-  if (!auth || !auth.login) {
+  if (!auth?.login) {
     return <div className='login'>
       <h1>Luncher</h1>
       <h4 style={{ marginBottom: "50px" }}>Aplikace pro profesionální management obědů</h4>
diff --git a/client/src/Utils.tsx b/client/src/Utils.tsx
index 524e8e0..4d081dc 100644
--- a/client/src/Utils.tsx
+++ b/client/src/Utils.tsx
@@ -93,7 +93,7 @@ export function formatDate(date: Date, format?: string) {
     let month = String(date.getMonth() + 1).padStart(2, "0");
     let year = String(date.getFullYear());
 
-    const f = (format === undefined) ? 'YYYY-MM-DD' : format;
+    const f = format ?? 'YYYY-MM-DD';
     return f.replace('DD', day).replace('MM', month).replace('YYYY', year);
 }
 
diff --git a/client/src/api/FoodApi.ts b/client/src/api/FoodApi.ts
index aa74827..d80bf8c 100644
--- a/client/src/api/FoodApi.ts
+++ b/client/src/api/FoodApi.ts
@@ -1,5 +1,4 @@
-import { AddChoiceRequest, ChangeDepartureTimeRequest, RemoveChoiceRequest, RemoveChoicesRequest, UpdateNoteRequest } from "../../../types";
-import { LunchChoice } from "../../../types";
+import { AddChoiceRequest, ChangeDepartureTimeRequest, LunchChoice, RemoveChoiceRequest, RemoveChoicesRequest, UpdateNoteRequest } from "../../../types";
 import { api } from "./Api";
 
 const FOOD_API_PREFIX = '/api/food';
diff --git a/client/src/api/PizzaDayApi.ts b/client/src/api/PizzaDayApi.ts
index 46f4564..3a39ea6 100644
--- a/client/src/api/PizzaDayApi.ts
+++ b/client/src/api/PizzaDayApi.ts
@@ -1,5 +1,4 @@
-import { AddPizzaRequest, FinishDeliveryRequest, RemovePizzaRequest, UpdatePizzaDayNoteRequest, UpdatePizzaFeeRequest } from "../../../types";
-import { PizzaVariant } from "../../../types";
+import { AddPizzaRequest, FinishDeliveryRequest, PizzaVariant, RemovePizzaRequest, UpdatePizzaDayNoteRequest, UpdatePizzaFeeRequest } from "../../../types";
 import { api } from "./Api";
 
 const PIZZADAY_API_PREFIX = '/api/pizzaDay';
diff --git a/client/src/api/VotingApi.ts b/client/src/api/VotingApi.ts
index a424736..a1f7341 100644
--- a/client/src/api/VotingApi.ts
+++ b/client/src/api/VotingApi.ts
@@ -1,5 +1,4 @@
-import { UpdateFeatureVoteRequest } from "../../../types";
-import { FeatureRequest } from "../../../types";
+import { FeatureRequest, UpdateFeatureVoteRequest } from "../../../types";
 import { api } from "./Api";
 
 const VOTING_API_PREFIX = '/api/voting';
diff --git a/client/src/components/Header.tsx b/client/src/components/Header.tsx
index d5ba480..4fcbbbb 100644
--- a/client/src/components/Header.tsx
+++ b/client/src/components/Header.tsx
@@ -78,7 +78,7 @@ export default function Header() {
                     cislo = cislo.padStart(16, '0');
                 }
                 let sum = 0;
-                for (var i = 0; i < cislo.length; i++) {
+                for (let i = 0; i < cislo.length; i++) {
                     const char = cislo.charAt(i);
                     const order = (cislo.length - 1) - i;
                     const weight = (2 ** order) % 11;
diff --git a/client/src/components/Loader.tsx b/client/src/components/Loader.tsx
index 608b12c..f898705 100644
--- a/client/src/components/Loader.tsx
+++ b/client/src/components/Loader.tsx
@@ -2,15 +2,15 @@ import { IconDefinition } from '@fortawesome/free-solid-svg-icons';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
 
 type Props = {
-  title?: String,
+  title?: string,
   icon: IconDefinition,
-  description: String,
-  animation?: String,
+  description: string,
+  animation?: string,
 }
 
-function Loader(props: Props) {
+function Loader(props: Readonly<Props>) {
   return <div className='loader'>
-    <h1>{props.title || 'Prosím čekejte...'}</h1>
+    <h1>{props.title ?? 'Prosím čekejte...'}</h1>
     <FontAwesomeIcon icon={props.icon} className={`loader-icon mb-3 ` + (props.animation ?? '')} />
     <p>{props.description}</p>
   </div>
diff --git a/client/src/components/PizzaOrderList.tsx b/client/src/components/PizzaOrderList.tsx
index 3c67eef..3d313e2 100644
--- a/client/src/components/PizzaOrderList.tsx
+++ b/client/src/components/PizzaOrderList.tsx
@@ -10,7 +10,7 @@ type Props = {
     creator: string,
 }
 
-export default function PizzaOrderList({ state, orders, onDelete, creator }: Props) {
+export default function PizzaOrderList({ state, orders, onDelete, creator }: Readonly<Props>) {
     const saveFees = async (customer: string, text?: string, price?: number) => {
         await updatePizzaFee(customer, text, price);
     }
@@ -21,26 +21,24 @@ export default function PizzaOrderList({ state, orders, onDelete, creator }: Pro
 
     const total = orders.reduce((total, order) => total + order.totalPrice, 0);
 
-    return <>
-        <Table className="mt-3" striped bordered hover>
-            <thead>
-                <tr>
-                    <th>Jméno</th>
-                    <th>Objednávka</th>
-                    <th>Poznámka</th>
-                    <th>Příplatek</th>
-                    <th>Cena</th>
-                </tr>
-            </thead>
-            <tbody>
-                {orders.map(order => <tr key={order.customer}>
-                    <PizzaOrderRow creator={creator} state={state} order={order} onDelete={onDelete} onFeeModalSave={saveFees} />
-                </tr>)}
-                <tr style={{ fontWeight: 'bold' }}>
-                    <td colSpan={4}>Celkem</td>
-                    <td>{`${total} Kč`}</td>
-                </tr>
-            </tbody>
-        </Table>
-    </>
+    return <Table className="mt-3" striped bordered hover>
+        <thead>
+            <tr>
+                <th>Jméno</th>
+                <th>Objednávka</th>
+                <th>Poznámka</th>
+                <th>Příplatek</th>
+                <th>Cena</th>
+            </tr>
+        </thead>
+        <tbody>
+            {orders.map(order => <tr key={order.customer}>
+                <PizzaOrderRow creator={creator} state={state} order={order} onDelete={onDelete} onFeeModalSave={saveFees} />
+            </tr>)}
+            <tr style={{ fontWeight: 'bold' }}>
+                <td colSpan={4}>Celkem</td>
+                <td>{`${total} Kč`}</td>
+            </tr>
+        </tbody>
+    </Table>
 }
\ No newline at end of file
diff --git a/client/src/components/PizzaOrderRow.tsx b/client/src/components/PizzaOrderRow.tsx
index 07493aa..896e65a 100644
--- a/client/src/components/PizzaOrderRow.tsx
+++ b/client/src/components/PizzaOrderRow.tsx
@@ -13,19 +13,19 @@ type Props = {
     onFeeModalSave: (customer: string, name?: string, price?: number) => void,
 }
 
-export default function PizzaOrderRow({ creator, order, state, onDelete, onFeeModalSave }: Props) {
+export default function PizzaOrderRow({ creator, order, state, onDelete, onFeeModalSave }: Readonly<Props>) {
     const auth = useAuth();
-    const [isFeeModalOpen, setFeeModalOpen] = useState<boolean>(false);
+    const [isFeeModalOpen, setIsFeeModalOpen] = useState<boolean>(false);
 
     const saveFees = (customer: string, text?: string, price?: number) => {
         onFeeModalSave(customer, text, price);
-        setFeeModalOpen(false);
+        setIsFeeModalOpen(false);
     }
 
     return <>
         <td>{order.customer}</td>
-        <td>{order.pizzaList!.map<React.ReactNode>((pizzaOrder, index) =>
-            <span key={index}>
+        <td>{order.pizzaList!.map<React.ReactNode>(pizzaOrder =>
+            <span key={pizzaOrder.name}>
                 {`${pizzaOrder.name}, ${pizzaOrder.size} (${pizzaOrder.price} Kč)`}
                 {auth?.login === order.customer && state === PizzaDayState.CREATED &&
                     <FontAwesomeIcon onClick={() => {
@@ -35,11 +35,11 @@ export default function PizzaOrderRow({ creator, order, state, onDelete, onFeeMo
             </span>)
             .reduce((prev, curr, index) => [prev, <br key={`br-${index}`} />, curr])}
         </td>
-        <td style={{ maxWidth: "200px" }}>{order.note || '-'}</td>
+        <td style={{ maxWidth: "200px" }}>{order.note ?? '-'}</td>
         <td style={{ maxWidth: "200px" }}>{order.fee?.price ? `${order.fee.price} Kč${order.fee.text ? ` (${order.fee.text})` : ''}` : '-'}</td>
         <td>
-            {order.totalPrice} Kč{auth?.login === creator && state === PizzaDayState.CREATED && <FontAwesomeIcon onClick={() => { setFeeModalOpen(true) }} title='Nastavit příplatek' className='action-icon' icon={faMoneyBill1} />}
+            {order.totalPrice} Kč{auth?.login === creator && state === PizzaDayState.CREATED && <FontAwesomeIcon onClick={() => { setIsFeeModalOpen(true) }} title='Nastavit příplatek' className='action-icon' icon={faMoneyBill1} />}
         </td>
-        <PizzaAdditionalFeeModal customerName={order.customer} isOpen={isFeeModalOpen} onClose={() => setFeeModalOpen(false)} onSave={saveFees} initialValues={{ text: order.fee?.text, price: order.fee?.price?.toString() }} />
+        <PizzaAdditionalFeeModal customerName={order.customer} isOpen={isFeeModalOpen} onClose={() => setIsFeeModalOpen(false)} onSave={saveFees} initialValues={{ text: order.fee?.text, price: order.fee?.price?.toString() }} />
     </>
 }
\ No newline at end of file
diff --git a/client/src/components/modals/FeaturesVotingModal.tsx b/client/src/components/modals/FeaturesVotingModal.tsx
index 8674614..a265500 100644
--- a/client/src/components/modals/FeaturesVotingModal.tsx
+++ b/client/src/components/modals/FeaturesVotingModal.tsx
@@ -9,7 +9,7 @@ type Props = {
 }
 
 /** Modální dialog pro hlasování o nových funkcích. */
-export default function FeaturesVotingModal({ isOpen, onClose, onChange, initialValues }: Props) {
+export default function FeaturesVotingModal({ isOpen, onClose, onChange, initialValues }: Readonly<Props>) {
 
     const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
         onChange(e.currentTarget.value as FeatureRequest, e.currentTarget.checked);
@@ -31,7 +31,7 @@ export default function FeaturesVotingModal({ isOpen, onClose, onChange, initial
                     label={FeatureRequest[key]}
                     onChange={handleChange}
                     value={key}
-                    defaultChecked={initialValues && initialValues.includes(key as FeatureRequest)}
+                    defaultChecked={initialValues?.includes(key as FeatureRequest)}
                 />
             })}
             <p className="mt-3" style={{ fontSize: '12px' }}>Něco jiného? Dejte vědět.</p>
diff --git a/client/src/components/modals/NoteModal.tsx b/client/src/components/modals/NoteModal.tsx
index 4928f50..b458844 100644
--- a/client/src/components/modals/NoteModal.tsx
+++ b/client/src/components/modals/NoteModal.tsx
@@ -8,7 +8,7 @@ type Props = {
 }
 
 /** Modální dialog pro úpravu obecné poznámky. */
-export default function NoteModal({ isOpen, onClose, onSave }: Props) {
+export default function NoteModal({ isOpen, onClose, onSave }: Readonly<Props>) {
     const note = useRef<HTMLInputElement>(null);
 
     const save = () => {
diff --git a/client/src/components/modals/PizzaAdditionalFeeModal.tsx b/client/src/components/modals/PizzaAdditionalFeeModal.tsx
index f843f57..2483cd2 100644
--- a/client/src/components/modals/PizzaAdditionalFeeModal.tsx
+++ b/client/src/components/modals/PizzaAdditionalFeeModal.tsx
@@ -10,17 +10,17 @@ type Props = {
 }
 
 /** Modální dialog pro nastavení příplatků za pizzu. */
-export default function PizzaAdditionalFeeModal({ customerName, isOpen, onClose, onSave, initialValues }: Props) {
+export default function PizzaAdditionalFeeModal({ customerName, isOpen, onClose, onSave, initialValues }: Readonly<Props>) {
     const textRef = useRef<HTMLInputElement>(null);
     const priceRef = useRef<HTMLInputElement>(null);
 
     const doSubmit = () => {
-        onSave(customerName, textRef.current?.value, parseInt(priceRef.current?.value || "0"));
+        onSave(customerName, textRef.current?.value, parseInt(priceRef.current?.value ?? "0"));
     }
 
     const handleKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
         if (e.key === 'Enter') {
-            onSave(customerName, textRef.current?.value, parseInt(priceRef.current?.value || "0"));
+            onSave(customerName, textRef.current?.value, parseInt(priceRef.current?.value ?? "0"));
         }
     }
 
diff --git a/client/src/components/modals/PizzaCalculatorModal.tsx b/client/src/components/modals/PizzaCalculatorModal.tsx
index 1520882..774426b 100644
--- a/client/src/components/modals/PizzaCalculatorModal.tsx
+++ b/client/src/components/modals/PizzaCalculatorModal.tsx
@@ -23,7 +23,7 @@ type Result = {
 }
 
 /** Modální dialog pro výpočet výhodnosti pizzy. */
-export default function PizzaCalculatorModal({ isOpen, onClose }: Props) {
+export default function PizzaCalculatorModal({ isOpen, onClose }: Readonly<Props>) {
     const diameter1Ref = useRef<HTMLInputElement>(null);
     const price1Ref = useRef<HTMLInputElement>(null);
     const diameter2Ref = useRef<HTMLInputElement>(null);
diff --git a/client/src/components/modals/SettingsModal.tsx b/client/src/components/modals/SettingsModal.tsx
index b83b341..4c4ba07 100644
--- a/client/src/components/modals/SettingsModal.tsx
+++ b/client/src/components/modals/SettingsModal.tsx
@@ -9,7 +9,7 @@ type Props = {
 }
 
 /** Modální dialog pro uživatelská nastavení. */
-export default function SettingsModal({ isOpen, onClose, onSave }: Props) {
+export default function SettingsModal({ isOpen, onClose, onSave }: Readonly<Props>) {
     const settings = useSettings();
     const bankAccountRef = useRef<HTMLInputElement>(null);
     const nameRef = useRef<HTMLInputElement>(null);
diff --git a/client/src/context/auth.tsx b/client/src/context/auth.tsx
index a22afd5..a2cb3d3 100644
--- a/client/src/context/auth.tsx
+++ b/client/src/context/auth.tsx
@@ -1,5 +1,4 @@
-import React, { ReactNode, useContext, useState } from "react"
-import { useEffect } from "react"
+import React, { ReactNode, useContext, useEffect, useState } from "react"
 import { useJwt } from "react-jwt";
 import { deleteToken, getToken, storeToken } from "../Utils";
 
@@ -16,7 +15,7 @@ type ContextProps = {
 
 const authContext = React.createContext<AuthContextProps | null>(null);
 
-export function ProvideAuth(props: ContextProps) {
+export function ProvideAuth(props: Readonly<ContextProps>) {
   const auth = useProvideAuth();
   return <authContext.Provider value={auth}>{props.children}</authContext.Provider>
 }
@@ -29,7 +28,7 @@ function useProvideAuth(): AuthContextProps {
   const [loginName, setLoginName] = useState<string | undefined>();
   const [trusted, setTrusted] = useState<boolean | undefined>();
   const [token, setToken] = useState<string | undefined>(getToken());
-  const { decodedToken } = useJwt(token || '');
+  const { decodedToken } = useJwt(token ?? '');
 
   useEffect(() => {
     if (token && token.length > 0) {
diff --git a/client/src/context/settings.tsx b/client/src/context/settings.tsx
index 13ea93e..8bbdec4 100644
--- a/client/src/context/settings.tsx
+++ b/client/src/context/settings.tsx
@@ -1,5 +1,4 @@
-import React, { ReactNode, useContext, useState } from "react"
-import { useEffect } from "react"
+import React, { ReactNode, useContext, useEffect, useState } from "react"
 
 const BANK_ACCOUNT_NUMBER_KEY = 'bank_account_number';
 const BANK_ACCOUNT_HOLDER_KEY = 'bank_account_holder_name';
@@ -20,7 +19,7 @@ type ContextProps = {
 
 const settingsContext = React.createContext<SettingsContextProps | null>(null);
 
-export function ProvideSettings(props: ContextProps) {
+export function ProvideSettings(props: Readonly<ContextProps>) {
   const settings = useProvideSettings();
   return <settingsContext.Provider value={settings}>{props.children}</settingsContext.Provider>
 }
@@ -45,7 +44,7 @@ function useProvideSettings(): SettingsContextProps {
     }
     const hideSoups = localStorage.getItem(HIDE_SOUPS_KEY);
     if (hideSoups !== null) {
-      setHideSoups(hideSoups === 'true' ? true : false);
+      setHideSoups(hideSoups === 'true');
     }
   }, [])
 
diff --git a/client/src/context/socket.js b/client/src/context/socket.js
index fd70419..ed2e2ea 100644
--- a/client/src/context/socket.js
+++ b/client/src/context/socket.js
@@ -18,8 +18,3 @@ export const SocketContext = React.createContext();
 export const EVENT_CONNECT = 'connect';
 export const EVENT_DISCONNECT = 'disconnect';
 export const EVENT_MESSAGE = 'message';
-// export const EVENT_CONFIG = 'config';
-// export const EVENT_TOASTER = 'toaster';
-// export const EVENT_VOTING = 'voting';
-// export const EVENT_VOTE_CONFIG = 'voteSettings';
-// export const EVENT_ADMIN = 'admin';
diff --git a/server/src/chefie.ts b/server/src/chefie.ts
index b9afba8..fe41d40 100644
--- a/server/src/chefie.ts
+++ b/server/src/chefie.ts
@@ -49,16 +49,16 @@ export async function downloadPizzy(mock: boolean): Promise<Pizza[]> {
     const $ = load(html);
     const links = $('.vypisproduktu > div > h4 > a');
     const urls = [];
-    for (let i = 0; i < links.length; i++) {
-        if (links[i].name === 'a' && links[i].attribs?.href) {
-            const pizzaUrl = links[i].attribs?.href;
+    for (const element of links) {
+        if (element.name === 'a' && element.attribs?.href) {
+            const pizzaUrl = element.attribs?.href;
             urls.push(buildPizzaUrl(pizzaUrl));
         }
     }
     // Scrapneme jednotlivé pizzy
     const result: Pizza[] = [];
-    for (let i = 0; i < urls.length; i++) {
-        const pizzaUrl = urls[i];
+    for (const element of urls) {
+        const pizzaUrl = element;
         const pizzaHtml = await axios.get(pizzaUrl).then(res => res.data);
         // Název
         const name = $('.produkt > h2', pizzaHtml).first().text()
diff --git a/server/src/index.ts b/server/src/index.ts
index 4d68368..db44e86 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -14,7 +14,7 @@ import votingRoutes from "./routes/votingRoutes";
 import easterEggRoutes from "./routes/easterEggRoutes";
 import statsRoutes from "./routes/statsRoutes";
 
-const ENVIRONMENT = process.env.NODE_ENV || 'production';
+const ENVIRONMENT = process.env.NODE_ENV ?? 'production';
 dotenv.config({ path: path.resolve(__dirname, `./.env.${ENVIRONMENT}`) });
 
 // Validace nastavení JWT tokenu - nemá bez něj smysl vůbec povolit server spustit
@@ -35,7 +35,7 @@ app.use(cors({
 
 // Zapínatelný login přes hlavičky - pokud je zapnutý nepovolí "basicauth"
 const HTTP_REMOTE_USER_ENABLED = process.env.HTTP_REMOTE_USER_ENABLED === 'true' || false;
-const HTTP_REMOTE_USER_HEADER_NAME = process.env.HTTP_REMOTE_USER_HEADER_NAME || 'remote-user';
+const HTTP_REMOTE_USER_HEADER_NAME = process.env.HTTP_REMOTE_USER_HEADER_NAME ?? 'remote-user';
 if (HTTP_REMOTE_USER_ENABLED) {
     if (!process.env.HTTP_REMOTE_TRUSTED_IPS) {
         throw new Error('Je zapnutý login z hlaviček, ale není nastaven rozsah adres ze kterých hlavička může přijít.');
@@ -79,7 +79,6 @@ app.post("/api/login", (req, res) => {
 
 // TODO dočasné řešení - QR se zobrazuje přes <img>, nemáme sem jak dostat token
 app.get("/api/qr", (req, res) => {
-    // const login = getLogin(parseToken(req));
     if (!req.query?.login) {
         throw Error("Nebyl předán login");
     }
@@ -148,8 +147,8 @@ app.use((err: any, req: any, res: any, next: any) => {
     next();
 });
 
-const PORT = process.env.PORT || 3001;
-const HOST = process.env.HOST || '0.0.0.0';
+const PORT = process.env.PORT ?? 3001;
+const HOST = process.env.HOST ?? '0.0.0.0';
 
 server.listen(PORT, () => {
     console.log(`Server listening on ${HOST}, port ${PORT}`);
diff --git a/server/src/notifikace.ts b/server/src/notifikace.ts
index c06181a..8e6ef83 100644
--- a/server/src/notifikace.ts
+++ b/server/src/notifikace.ts
@@ -1,14 +1,11 @@
-/** Notifikace */
 import axios from 'axios';
 import dotenv from 'dotenv';
 import path from 'path';
 import { getClientData, getToday } from "./service";
 import { getUsersByLocation, getHumanTime } from "./utils";
-import getStorage from "./storage";
 import { NotifikaceData, NotifikaceInput } from '../../types';
 
-const storage = getStorage();
-const ENVIRONMENT = process.env.NODE_ENV || 'production'
+const ENVIRONMENT = process.env.NODE_ENV ?? 'production';
 dotenv.config({ path: path.resolve(__dirname, `../.env.${ENVIRONMENT}`) });
 
 // const gotifyDataRaw = process.env.GOTIFY_SERVERS_AND_KEYS || "{}";
diff --git a/server/src/pizza.ts b/server/src/pizza.ts
index ada27b0..b7a9ff3 100644
--- a/server/src/pizza.ts
+++ b/server/src/pizza.ts
@@ -128,11 +128,11 @@ export async function removePizzaOrder(login: string, pizzaOrder: PizzaVariant)
     if (!clientData.pizzaDay) {
         throw Error("Pizza day pro dnešní den neexistuje");
     }
-    const orderIndex = clientData.pizzaDay!.orders!.findIndex(o => o.customer === login);
+    const orderIndex = clientData.pizzaDay.orders!.findIndex(o => o.customer === login);
     if (orderIndex < 0) {
         throw Error("Nebyly nalezeny žádné objednávky pro uživatele " + login);
     }
-    const order = clientData.pizzaDay!.orders![orderIndex];
+    const order = clientData.pizzaDay.orders![orderIndex];
     const index = order.pizzaList!.findIndex(o => o.name === pizzaOrder.name && o.size === pizzaOrder.size);
     if (index < 0) {
         throw Error("Objednávka s danými parametry nebyla nalezena");
@@ -308,7 +308,7 @@ export async function updatePizzaFee(login: string, targetLogin: string, text?:
         targetOrder.fee = { text, price };
     }
     // Přepočet ceny
-    targetOrder.totalPrice = targetOrder.pizzaList.reduce((price, pizzaOrder) => price + pizzaOrder.price, 0) + (targetOrder.fee?.price || 0);
+    targetOrder.totalPrice = targetOrder.pizzaList.reduce((price, pizzaOrder) => price + pizzaOrder.price, 0) + (targetOrder.fee?.price ?? 0);
     await storage.setData(today, clientData);
     return clientData;
 }
\ No newline at end of file
diff --git a/server/src/restaurants.ts b/server/src/restaurants.ts
index 580c819..3ea236c 100644
--- a/server/src/restaurants.ts
+++ b/server/src/restaurants.ts
@@ -92,7 +92,6 @@ export const getMenuSladovnicka = async (firstDayOfWeek: Date, mock: boolean = f
             const rowText = $(dayRow).first().text().trim();
             if (rowText === searchedDayText) {
                 index = i;
-                return;
             }
         })
         if (index === undefined) {
@@ -360,7 +359,6 @@ export const getMenuZastavkaUmichala = async (firstDayOfWeek: Date, mock: boolea
                 price: "",
                 isSoup: false,
             }];
-            continue;
         } else {
             const url = (currentDate.getDate() === nowDate) ?
                 ZASTAVKAUMICHALA_URL : ZASTAVKAUMICHALA_URL + '/?do=dailyMenu-changeDate&dailyMenu-dateString=' + formatDate(currentDate, 'DD.MM.YYYY');
diff --git a/server/src/routes/easterEggRoutes.ts b/server/src/routes/easterEggRoutes.ts
index 46bcd5b..347736a 100644
--- a/server/src/routes/easterEggRoutes.ts
+++ b/server/src/routes/easterEggRoutes.ts
@@ -1,5 +1,5 @@
 import express, { NextFunction } from "express";
-import { getLogin, getTrusted } from "../auth";
+import { getLogin } from "../auth";
 import { parseToken } from "../utils";
 import path from "path";
 import fs from "fs";
@@ -34,16 +34,11 @@ function generateUrl() {
  */
 function getEasterEggImage(req: any, res: any, next: NextFunction) {
     const login = getLogin(parseToken(req));
-    const trusted = getTrusted(parseToken(req));
     try {
-        // TODO vrátit!
-        // if (trusted) {
-        if (true) {
-            if (login in easterEggs) {
-                const imagePath = easterEggs[login][Math.floor(Math.random() * easterEggs[login].length)].path;
-                res.sendFile(path.join(__dirname, IMAGES_PATH, imagePath));
-                return;
-            }
+        if (login in easterEggs) {
+            const imagePath = easterEggs[login][Math.floor(Math.random() * easterEggs[login].length)].path;
+            res.sendFile(path.join(__dirname, IMAGES_PATH, imagePath));
+            return;
         }
         res.sendStatus(404);
     } catch (e: any) { next(e) }
@@ -124,7 +119,7 @@ let easterEggs: EasterEggsJson;
 if (fs.existsSync(EASTER_EGGS_JSON_PATH)) {
     const content = fs.readFileSync(EASTER_EGGS_JSON_PATH, 'utf-8');
     easterEggs = JSON.parse(content);
-    for (const [key, eggs] of Object.entries(easterEggs)) {
+    for (const [_, eggs] of Object.entries(easterEggs)) {
         for (const easterEgg of eggs) {
             const url = generateUrl();
             easterEgg.url = url;
@@ -138,16 +133,11 @@ if (fs.existsSync(EASTER_EGGS_JSON_PATH)) {
 // Získání náhodného easter eggu pro přihlášeného uživatele
 router.get("/", async (req, res, next) => {
     const login = getLogin(parseToken(req));
-    const trusted = getTrusted(parseToken(req));
     try {
-        // TODO vrátit!
-        // if (trusted) {
-        if (true) {
-            if (easterEggs && login in easterEggs) {
-                const randomEasterEgg = easterEggs[login][Math.floor(Math.random() * easterEggs[login].length)];
-                const { path, startOffset, endOffset, ...strippedEasterEgg } = randomEasterEgg; // Path klient k ničemu nepotřebuje a nemá ho znát
-                return res.status(200).json({ ...strippedEasterEgg, ...getRandomPosition(startOffset, endOffset) });
-            }
+        if (easterEggs && login in easterEggs) {
+            const randomEasterEgg = easterEggs[login][Math.floor(Math.random() * easterEggs[login].length)];
+            const { path, startOffset, endOffset, ...strippedEasterEgg } = randomEasterEgg; // Path klient k ničemu nepotřebuje a nemá ho znát
+            return res.status(200).json({ ...strippedEasterEgg, ...getRandomPosition(startOffset, endOffset) });
         }
         return res.status(200).send();
     } catch (e: any) { next(e) }
diff --git a/server/src/routes/foodRoutes.ts b/server/src/routes/foodRoutes.ts
index bb0d20a..db4ff2c 100644
--- a/server/src/routes/foodRoutes.ts
+++ b/server/src/routes/foodRoutes.ts
@@ -4,8 +4,7 @@ import { addChoice, getDateForWeekIndex, getToday, removeChoice, removeChoices,
 import { getDayOfWeekIndex, parseToken } from "../utils";
 import { getWebsocket } from "../websocket";
 import { callNotifikace } from "../notifikace";
-import { AddChoiceRequest, ChangeDepartureTimeRequest, IDayIndex, RemoveChoiceRequest, RemoveChoicesRequest, UpdateNoteRequest } from "../../../types";
-import { UdalostEnum } from "../../../types";
+import { AddChoiceRequest, ChangeDepartureTimeRequest, IDayIndex, RemoveChoiceRequest, RemoveChoicesRequest, UdalostEnum, UpdateNoteRequest } from "../../../types";
 
 /**
  * Ověří a vrátí index dne v týdnu z požadavku, za předpokladu, že byl předán, a je zároveň
diff --git a/server/src/routes/votingRoutes.ts b/server/src/routes/votingRoutes.ts
index 618b8b7..2aa6672 100644
--- a/server/src/routes/votingRoutes.ts
+++ b/server/src/routes/votingRoutes.ts
@@ -2,8 +2,7 @@ import express, { Request, Response } from "express";
 import { getLogin } from "../auth";
 import { parseToken } from "../utils";
 import { getUserVotes, updateFeatureVote } from "../voting";
-import { UpdateFeatureVoteRequest } from "../../../types";
-import { FeatureRequest } from "../../../types";
+import { FeatureRequest, UpdateFeatureVoteRequest } from "../../../types";
 
 const router = express.Router();
 
diff --git a/server/src/service.ts b/server/src/service.ts
index 9a73e55..344d1ff 100644
--- a/server/src/service.ts
+++ b/server/src/service.ts
@@ -1,6 +1,6 @@
 import { InsufficientPermissions, formatDate, getDayOfWeekIndex, getFirstWorkDayOfWeek, getHumanDate, getIsWeekend, getWeekNumber } from "./utils";
 import getStorage from "./storage";
-import { getMenuSladovnicka, getMenuTechTower, getMenuUMotliku, getMenuZastavkaUmichala, getMenuSenkSerikova } from "./restaurants";
+import { getMenuSladovnicka, getMenuTechTower, getMenuZastavkaUmichala, getMenuSenkSerikova } from "./restaurants";
 import { getTodayMock } from "./mock";
 import { ClientData, DepartureTime, LunchChoice, Restaurant, RestaurantDayMenu, WeekMenu } from "../../types";
 
@@ -152,10 +152,10 @@ export async function getRestaurantMenu(restaurant: keyof typeof Restaurant, dat
                             weekMenu[i][restaurant]!.closed = true;
                         }
                     }
-                    break;
                 } catch (e: any) {
                     console.error("Selhalo načtení jídel pro podnik TechTower", e);
                 }
+                break;
             case 'ZASTAVKAUMICHALA':
                 try {
                     const zastavkaUmichalaFood = await getMenuZastavkaUmichala(firstDay, mock);
@@ -165,10 +165,10 @@ export async function getRestaurantMenu(restaurant: keyof typeof Restaurant, dat
                             weekMenu[i][restaurant]!.closed = true;
                         }
                     }
-                    break;
                 } catch (e: any) {
                     console.error("Selhalo načtení jídel pro podnik Zastávka u Michala", e);
                 }
+                break;
             case 'SENKSERIKOVA':
                 try {
                     const senkSerikovaFood = await getMenuSenkSerikova(firstDay, mock);
@@ -178,10 +178,10 @@ export async function getRestaurantMenu(restaurant: keyof typeof Restaurant, dat
                             weekMenu[i][restaurant]!.closed = true;
                         }
                     }
-                    break;
                 } catch (e: any) {
                     console.error("Selhalo načtení jídel pro podnik Pivovarský šenk Šeříková", e);
                 }
+                break;
         }
         await storage.setData(getMenuKey(usedDate), weekMenu);
     }
diff --git a/server/src/stats.ts b/server/src/stats.ts
index 6f9d2df..34507f6 100644
--- a/server/src/stats.ts
+++ b/server/src/stats.ts
@@ -2,7 +2,6 @@ import { DailyStats, LunchChoice, WeeklyStats } from "../../types";
 import { getStatsMock } from "./mock";
 import { getClientData } from "./service";
 import getStorage from "./storage";
-import { formatDate } from "./utils";
 
 const storage = getStorage();
 
diff --git a/server/src/storage/index.ts b/server/src/storage/index.ts
index 082d492..dea6802 100644
--- a/server/src/storage/index.ts
+++ b/server/src/storage/index.ts
@@ -4,7 +4,7 @@ import { StorageInterface } from "./StorageInterface";
 import JsonStorage from "./json";
 import RedisStorage from "./redis";
 
-const ENVIRONMENT = process.env.NODE_ENV || 'production';
+const ENVIRONMENT = process.env.NODE_ENV ?? 'production';
 dotenv.config({ path: path.resolve(__dirname, `../.env.${ENVIRONMENT}`) });
 
 const JSON_KEY = 'json';
diff --git a/server/src/storage/redis.ts b/server/src/storage/redis.ts
index 4251223..966236a 100644
--- a/server/src/storage/redis.ts
+++ b/server/src/storage/redis.ts
@@ -8,15 +8,15 @@ let client: RedisClientType;
  */
 export default class RedisStorage implements StorageInterface {
     constructor() {
-        const HOST = process.env.REDIS_HOST || 'localhost';
-        const PORT = process.env.REDIS_PORT || 6379;
+        const HOST = process.env.REDIS_HOST ?? 'localhost';
+        const PORT = process.env.REDIS_PORT ?? 6379;
         client = createClient({ url: `redis://${HOST}:${PORT}` });
         client.connect();
     }
 
     async hasData(key: string) {
         const data = await client.json.get(key);
-        return (data ? true : false);
+        return (!!data);
     }
 
     async getData<Type>(key: string) {
diff --git a/server/src/utils.ts b/server/src/utils.ts
index 3c29a90..fa4402d 100644
--- a/server/src/utils.ts
+++ b/server/src/utils.ts
@@ -8,7 +8,7 @@ export function formatDate(date: Date, format?: string) {
     let month = String(date.getMonth() + 1).padStart(2, "0");
     let year = String(date.getFullYear());
 
-    const f = (format === undefined) ? 'YYYY-MM-DD' : format;
+    const f = format ?? 'YYYY-MM-DD';
     return f.replace('DD', day).replace('MM', month).replace('YYYY', year);
 }
 
@@ -61,10 +61,10 @@ export function getLastWorkDayOfWeek(date: Date) {
 
 /** Vrátí pořadové číslo týdne předaného data v roce dle ISO 8601. */
 export function getWeekNumber(inputDate: Date) {
-    var date = new Date(inputDate.getTime());
+    const date = new Date(inputDate.getTime());
     date.setHours(0, 0, 0, 0);
     date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
-    var week1 = new Date(date.getFullYear(), 0, 4);
+    const week1 = new Date(date.getFullYear(), 0, 4);
     return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000 - 3 + (week1.getDay() + 6) % 7) / 7);
 }