diff --git a/apps/client/src/common/components/error-boundary/ErrorBoundary.jsx b/apps/client/src/common/components/error-boundary/ErrorBoundary.jsx
index b3268fcda..317c03d19 100644
--- a/apps/client/src/common/components/error-boundary/ErrorBoundary.jsx
+++ b/apps/client/src/common/components/error-boundary/ErrorBoundary.jsx
@@ -23,7 +23,7 @@ class ErrorBoundary extends React.Component {
 
   componentDidCatch(error, info) {
     this.setState({
-      error: error,
+      error,
       errorInfo: info,
     });
 
diff --git a/apps/client/src/common/components/view-params-editor/ViewParamsEditor.tsx b/apps/client/src/common/components/view-params-editor/ViewParamsEditor.tsx
index 960194f33..2947ab64f 100644
--- a/apps/client/src/common/components/view-params-editor/ViewParamsEditor.tsx
+++ b/apps/client/src/common/components/view-params-editor/ViewParamsEditor.tsx
@@ -12,7 +12,7 @@ import {
   useDisclosure,
 } from '@chakra-ui/react';
 
-import { useLocalStorage } from '../../../common/hooks/useLocalStorage';
+import { useLocalStorage } from '../../hooks/useLocalStorage';
 
 import ParamInput from './ParamInput';
 import { ParamField } from './types';
diff --git a/apps/client/src/features/menu/RundownMenu.tsx b/apps/client/src/features/menu/RundownMenu.tsx
index 0b3a30240..b1bf937e1 100644
--- a/apps/client/src/features/menu/RundownMenu.tsx
+++ b/apps/client/src/features/menu/RundownMenu.tsx
@@ -7,7 +7,7 @@ import { IoTrashOutline } from '@react-icons/all-files/io5/IoTrashOutline';
 import { SupportedEvent } from 'ontime-types';
 
 import { useEventAction } from '../../common/hooks/useEventAction';
-import { useEventSelection } from '../../features/rundown/useEventSelection';
+import { useEventSelection } from '../rundown/useEventSelection';
 
 const RundownMenu = ({ children }: { children: ReactNode }) => {
   const { clearSelectedEvents } = useEventSelection();
diff --git a/apps/client/src/features/operator/Operator.tsx b/apps/client/src/features/operator/Operator.tsx
index 9a9b40b66..6a50f6328 100644
--- a/apps/client/src/features/operator/Operator.tsx
+++ b/apps/client/src/features/operator/Operator.tsx
@@ -52,7 +52,7 @@ export default function Operator() {
   const scrollRef = useRef<HTMLDivElement | null>(null);
   const scrollToComponent = useFollowComponent({
     followRef: selectedRef,
-    scrollRef: scrollRef,
+    scrollRef,
     doFollow: !lockAutoScroll,
     topOffset: selectedOffset,
   });
diff --git a/apps/client/src/features/rundown/useEventSelection.ts b/apps/client/src/features/rundown/useEventSelection.ts
index fad93bffd..7308266a1 100644
--- a/apps/client/src/features/rundown/useEventSelection.ts
+++ b/apps/client/src/features/rundown/useEventSelection.ts
@@ -44,7 +44,7 @@ export const useEventSelection = create<EventSelectionStore>()((set, get) => ({
         selectedEvents.delete(id);
 
         return set({
-          selectedEvents: selectedEvents,
+          selectedEvents,
           anchoredIndex: newAnchoredIndex?.index ?? 0,
         });
       }
diff --git a/apps/server/src/app.ts b/apps/server/src/app.ts
index 425bd6346..406ae2d97 100644
--- a/apps/server/src/app.ts
+++ b/apps/server/src/app.ts
@@ -200,7 +200,7 @@ export const startServer = async () => {
  * @param overrideConfig
  * @return {Promise<void>}
  */
-export const startOSCServer = async (overrideConfig = null) => {
+export const startOSCServer = async (overrideConfig?: { port: number }) => {
   checkStart(OntimeStartOrder.InitIO);
 
   const { osc } = DataProvider.getData();
diff --git a/apps/server/src/classes/simple-timer/SimpleTimer.ts b/apps/server/src/classes/simple-timer/SimpleTimer.ts
index d6a5b4181..baea1e712 100644
--- a/apps/server/src/classes/simple-timer/SimpleTimer.ts
+++ b/apps/server/src/classes/simple-timer/SimpleTimer.ts
@@ -10,8 +10,6 @@ export class SimpleTimer {
   private startedAt: number | null = null;
   private pausedAt: number | null = null;
 
-  constructor() {}
-
   public reset() {
     this.state = {
       duration: 0,
diff --git a/apps/server/src/classes/simple-timer/__tests__/SimpleTimer.test.ts b/apps/server/src/classes/simple-timer/__tests__/SimpleTimer.test.ts
index 9575a0213..7409ff6f9 100644
--- a/apps/server/src/classes/simple-timer/__tests__/SimpleTimer.test.ts
+++ b/apps/server/src/classes/simple-timer/__tests__/SimpleTimer.test.ts
@@ -72,7 +72,8 @@ describe('SimpleTimer count-down', () => {
       expect(newState).toStrictEqual(expected);
 
       newState = timer.update(1800);
-      (expected.current = initialTime - 1800 + pausedTime), expect(newState).toStrictEqual(expected);
+      expected.current = initialTime - 1800 + pausedTime;
+      expect(newState).toStrictEqual(expected);
     });
 
     test('stopping the timer clears the running data', () => {
diff --git a/apps/server/src/controllers/integrationController.config.ts b/apps/server/src/controllers/integrationController.config.ts
index 32ad21543..d65562dd5 100644
--- a/apps/server/src/controllers/integrationController.config.ts
+++ b/apps/server/src/controllers/integrationController.config.ts
@@ -52,7 +52,7 @@ export function updateEvent(
   const event = EventLoader.getEventWithId(eventId);
   if (event) {
     if (!isOntimeEvent(event)) {
-      throw new Error(`Can only update events`);
+      throw new Error('Can only update events');
     }
     const propertiesToUpdate = { [propertyName]: newValue };
 
diff --git a/apps/server/src/controllers/ontimeController.ts b/apps/server/src/controllers/ontimeController.ts
index ce1e1ec19..f0aa3d5bb 100644
--- a/apps/server/src/controllers/ontimeController.ts
+++ b/apps/server/src/controllers/ontimeController.ts
@@ -115,7 +115,7 @@ const parseAndApply = async (file, _req, res, options) => {
  */
 const getNetworkInterfaces = () => {
   const nets = networkInterfaces();
-  const results = [];
+  const results: { name: string; address: string }[] = [];
 
   for (const name of Object.keys(nets)) {
     for (const net of nets[name]) {
diff --git a/apps/server/src/modules/loadDemo.ts b/apps/server/src/modules/loadDemo.ts
index 84d4361bf..b94bf28cd 100644
--- a/apps/server/src/modules/loadDemo.ts
+++ b/apps/server/src/modules/loadDemo.ts
@@ -12,7 +12,7 @@ export const populateDemo = () => {
     Promise.all(
       resolveDemoPath.map((to, index) => {
         const from = pathToStartDemo[index];
-        copyFile(from, to);
+        return copyFile(from, to);
       }),
     );
   } catch (_) {
diff --git a/apps/server/src/services/integration-service/HttpIntegration.ts b/apps/server/src/services/integration-service/HttpIntegration.ts
index 755fa50b4..f325eddb7 100644
--- a/apps/server/src/services/integration-service/HttpIntegration.ts
+++ b/apps/server/src/services/integration-service/HttpIntegration.ts
@@ -34,18 +34,10 @@ export class HttpIntegration implements IIntegration<HttpSubscriptionOptions> {
     }
 
     this.initSubscriptions(subscriptions);
-
-    try {
-      return {
-        success: true,
-        message: `HTTP integration client ready`,
-      };
-    } catch (error) {
-      return {
-        success: false,
-        message: `Failed initialising HTTP integration: ${error}`,
-      };
-    }
+    return {
+      success: true,
+      message: 'HTTP integration client ready',
+    };
   }
 
   initSubscriptions(subscriptionOptions: HttpSubscription) {
diff --git a/apps/server/src/services/integration-service/OscIntegration.ts b/apps/server/src/services/integration-service/OscIntegration.ts
index 6cf8fe958..f1652e704 100644
--- a/apps/server/src/services/integration-service/OscIntegration.ts
+++ b/apps/server/src/services/integration-service/OscIntegration.ts
@@ -99,6 +99,10 @@ export class OscIntegration implements IIntegration<OscSubscriptionOptions> {
   }
 
   emit(path: string, payload?: ArgumentType) {
+    if (!this.oscClient) {
+      return;
+    }
+
     const message = new Message(path);
     if (payload) {
       try {
diff --git a/apps/server/src/services/runtime-service/RuntimeService.ts b/apps/server/src/services/runtime-service/RuntimeService.ts
index aa55b48c7..1573b41e6 100644
--- a/apps/server/src/services/runtime-service/RuntimeService.ts
+++ b/apps/server/src/services/runtime-service/RuntimeService.ts
@@ -14,8 +14,6 @@ import * as runtimeState from '../../stores/runtimeState.js';
 class RuntimeService {
   private eventTimer: TimerService | null = null;
 
-  constructor() {}
-
   init(resumable: RestorePoint | null) {
     logger.info(LogOrigin.Server, 'Runtime service started');
     // TODO: refresh at 32ms, slowing down now to keep UI responsive while we dont have granular updates
@@ -339,6 +337,11 @@ class RuntimeService {
     const { selectedEventId, playback } = restorePoint;
     if (playback === Playback.Roll) {
       this.roll();
+      return;
+    }
+
+    if (!selectedEventId) {
+      return;
     }
 
     // the db would have to change for the event not to exist
diff --git a/apps/server/src/services/timerUtils.ts b/apps/server/src/services/timerUtils.ts
index b80e0027f..695b71ce4 100644
--- a/apps/server/src/services/timerUtils.ts
+++ b/apps/server/src/services/timerUtils.ts
@@ -1,4 +1,4 @@
-import { MaybeNumber, OntimeEvent, TimerType } from 'ontime-types';
+import { MaybeNumber, MaybeString, OntimeEvent, TimerType } from 'ontime-types';
 import { dayInMs } from 'ontime-utils';
 import { RuntimeState } from '../stores/runtimeState.js';
 import { sortArrayByProperty } from '../utils/arrayUtils.js';
@@ -94,13 +94,26 @@ export function skippedOutOfEvent(state: RuntimeState, previousTime: number, ski
   return hasSkipped && (adjustedClock > adjustedExpectedFinish || adjustedClock < startedAt);
 }
 
+type RollTimers = {
+  nowIndex: MaybeNumber;
+  nowId: MaybeString;
+  publicIndex: MaybeNumber;
+  nextIndex: MaybeNumber;
+  publicNextIndex: MaybeNumber;
+  timeToNext: MaybeNumber;
+  nextEvent: OntimeEvent | null;
+  nextPublicEvent: OntimeEvent | null;
+  currentEvent: OntimeEvent | null;
+  currentPublicEvent: OntimeEvent | null;
+};
+
 /**
  * Finds loading information given a current rundown and time
  * @param {OntimeEvent[]} rundown - List of playable events
  * @param {number} timeNow - time now in ms
  * @returns {{}}
  */
-export const getRollTimers = (rundown: OntimeEvent[], timeNow: number) => {
+export const getRollTimers = (rundown: OntimeEvent[], timeNow: number): RollTimers => {
   let nowIndex: number | null = null; // index of event now
   let nowId: string | null = null; // id of event now
   let publicIndex: number | null = null; // index of public event now
diff --git a/apps/server/src/utils/sheetsAuth.ts b/apps/server/src/utils/sheetsAuth.ts
index d0f0553b7..64d98193c 100644
--- a/apps/server/src/utils/sheetsAuth.ts
+++ b/apps/server/src/utils/sheetsAuth.ts
@@ -100,7 +100,7 @@ class Sheet {
       this.authServerTimeout = setTimeout(
         () => {
           Sheet.authUrl = null;
-          server.unref;
+          server.unref();
         },
         2 * 60 * 1000,
       );
@@ -140,7 +140,7 @@ class Sheet {
         }
         if (!searchParams.has('code')) {
           res.end('No authentication code provided.');
-          logger.info(LogOrigin.Server, `Sheet: Cannot read authentication code`);
+          logger.info(LogOrigin.Server, 'Sheet: Cannot read authentication code');
           return;
         }
         const code = searchParams.get('code');
@@ -151,7 +151,7 @@ class Sheet {
         client.credentials = tokens;
         Sheet.client = client;
         res.end('Authentication successful! Please close this tab and return to OnTime.');
-        logger.info(LogOrigin.Server, `Sheet: Authentication successful`);
+        logger.info(LogOrigin.Server, 'Sheet: Authentication successful');
       } catch (e) {
         logger.error(LogOrigin.Server, `Sheet: ${e}`);
       } finally {
@@ -277,7 +277,7 @@ class Sheet {
       spreadsheetId: id,
       valueRenderOption: 'FORMATTED_VALUE',
       majorDimension: 'ROWS',
-      range: range,
+      range,
     });
     if (readResponse.status === 200) {
       const { rundownMetadata } = parseExcel(readResponse.data.values, options);
@@ -364,7 +364,7 @@ class Sheet {
       const dataFromSheet = parseExcel(googleResponse.data.values, options);
       res.data.rundown = parseRundown(dataFromSheet);
       if (res.data.rundown.length < 1) {
-        throw new Error(`Sheet: Could not find data to import in the worksheet`);
+        throw new Error('Sheet: Could not find data to import in the worksheet');
       }
       res.data.userFields = parseUserFields(dataFromSheet);
       return res;
diff --git a/apps/server/src/utils/upload.js b/apps/server/src/utils/upload.ts
similarity index 90%
rename from apps/server/src/utils/upload.js
rename to apps/server/src/utils/upload.ts
index c9b7ff5cd..58144f72c 100644
--- a/apps/server/src/utils/upload.js
+++ b/apps/server/src/utils/upload.ts
@@ -7,8 +7,8 @@ import { ensureDirectory } from './fileManagement.js';
 import { getAppDataPath } from '../setup.js';
 
 function generateNewFileName(filePath, callback) {
-  let baseName = path.basename(filePath, path.extname(filePath));
-  let extension = path.extname(filePath);
+  const baseName = path.basename(filePath, path.extname(filePath));
+  const extension = path.extname(filePath);
   let counter = 1;
 
   const checkExistence = (newPath) => {
@@ -24,7 +24,7 @@ function generateNewFileName(filePath, callback) {
     });
   };
 
-  let newPath = path.join(path.dirname(filePath), `${baseName} (${counter})${extension}`);
+  const newPath = path.join(path.dirname(filePath), `${baseName} (${counter})${extension}`);
   checkExistence(newPath);
 }
 
@@ -75,6 +75,6 @@ const filterAllowed = (req, file, cb) => {
 
 // Build multer uploader for a single file
 export const uploadFile = multer({
-  storage: storage,
+  storage,
   fileFilter: filterAllowed,
 }).single('userFile');