diff --git a/src/app.ts b/src/app.ts
index 3b8063e..81739ee 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -1,107 +1,136 @@
 import { Gotify } from "gotify";
-import { QueryProtocol, TeamSpeak, TextMessageTargetMode } from "ts3-nodejs-library"
+import {
+  QueryProtocol,
+  TeamSpeak,
+  TextMessageTargetMode,
+} from "ts3-nodejs-library";
 import { createLogger, transports, format } from "winston";
 
-import { GOTIFY_TITLE, GOTIFY_TOKEN, GOTIFY_URL, LOG_LEVEL, MODE, TS3_HOST, TS3_NICKNAME, TS3_PASSWORD, TS3_QUERY_PORT, TS3_SERVER_PORT, TS3_USERNAME } from "./env";
+import {
+  GOTIFY_TITLE,
+  GOTIFY_TOKEN,
+  GOTIFY_URL,
+  LOG_LEVEL,
+  MODE,
+  TS3_HOST,
+  TS3_NICKNAME,
+  TS3_PASSWORD,
+  TS3_QUERY_PORT,
+  TS3_SERVER_PORT,
+  TS3_USERNAME,
+} from "./env";
+import type { Mode } from "./types";
 
 const logger = createLogger({
-    level: LOG_LEVEL,
-    transports: [new transports.Console()],
-    format: format.combine(
-        format.colorize(),
-        format.timestamp(),
-    ),
-})
+  level: LOG_LEVEL,
+  transports: [new transports.Console()],
+  format: format.combine(format.colorize(), format.timestamp()),
+});
 
 const gotify = new Gotify({
-    server: GOTIFY_URL,
-})
+  server: GOTIFY_URL,
+});
 
 const gotifyConfig = {
-    app: GOTIFY_TOKEN,
-    title: GOTIFY_TITLE
-}
+  app: GOTIFY_TOKEN,
+  title: GOTIFY_TITLE,
+};
 
-function getModes() {
-    const modeIsProvided = process.env.MODE != undefined
+function getModes(): {
+  [key in Mode]: boolean;
+} {
+  const modes = MODE.map((mode) => {
+    return { [mode]: true };
+  });
 
-    return {
-        connect: MODE?.includes("connect") || false,
-        disconnect: MODE?.includes("disconnect") || false,
-        moved: MODE?.includes("moved") || false,
-        message: MODE?.includes("message") || false
-    }
+  return Object.assign(
+    {
+      connect: false,
+      disconnect: false,
+      moved: false,
+      message: false,
+    },
+    ...modes
+  );
 }
 
 function sendNotification(message: string) {
-    gotify.send({
-        ...gotifyConfig,
-        message: message,
-    }).catch((error: Error) => {
-        logger.error(`Error sending message to gotify: ${error.message}`)
+  gotify
+    .send({
+      ...gotifyConfig,
+      message: message,
     })
+    .catch((error: Error) => {
+      logger.error(`Error sending message to gotify: ${error.message}`);
+    });
 }
 
 function resolveMessageTarget(target: TextMessageTargetMode): string {
-    if (target === 1) {
-        return "Client"
-    } else if (target === 2) {
-        return "Channel"
-    } else {
-        return "Server"
-    }
+  if (target === 1) {
+    return "Client";
+  } else if (target === 2) {
+    return "Channel";
+  } else {
+    return "Server";
+  }
 }
 
 function handleMessage(message: string) {
-    logger.debug(message)
-    sendNotification(message)
+  logger.debug(message);
+  sendNotification(message);
 }
 
 TeamSpeak.connect({
-    host: TS3_HOST,
-    queryport: TS3_QUERY_PORT,
-    serverport: TS3_SERVER_PORT,
-    protocol: QueryProtocol.RAW,
-    username: TS3_USERNAME,
-    password: TS3_PASSWORD,
-    nickname: TS3_NICKNAME,
+  host: TS3_HOST,
+  queryport: TS3_QUERY_PORT,
+  serverport: TS3_SERVER_PORT,
+  protocol: QueryProtocol.RAW,
+  username: TS3_USERNAME,
+  password: TS3_PASSWORD,
+  nickname: TS3_NICKNAME,
 }).then((teamspeak) => {
-    const mode = getModes()
+  const mode = getModes();
 
-    logger.info("connected to TS3")
+  logger.info("connected to TS3");
 
-    if (mode.connect) {
-        teamspeak.on("clientconnect", (event) => {
-            handleMessage(`${event.client.nickname} connected`)
-        })
-    }
+  if (mode.connect) {
+    teamspeak.on("clientconnect", (event) => {
+      handleMessage(`${event.client.nickname} connected`);
+    });
+  }
 
-    if (mode.disconnect) {
-        teamspeak.on("clientdisconnect", (event) => {
-            handleMessage(`${event.client?.nickname} disconnected`)
-        })
-    }
+  if (mode.disconnect) {
+    teamspeak.on("clientdisconnect", (event) => {
+      handleMessage(`${event.client?.nickname} disconnected`);
+    });
+  }
 
-    if (mode.message) {
-        teamspeak.on("textmessage", (event) => {
-            handleMessage(`${event.invoker.nickname} wrote ${event.msg} to a ${resolveMessageTarget(event.targetmode)}`)
-        })
-    }
+  if (mode.message) {
+    teamspeak.on("textmessage", (event) => {
+      handleMessage(
+        `${event.invoker.nickname} wrote ${
+          event.msg
+        } to a ${resolveMessageTarget(event.targetmode)}`
+      );
+    });
+  }
 
-    if (mode.moved) {
-        teamspeak.on("clientmoved", (event) => {
-            handleMessage(`${event.client.nickname} got moved to ${event.channel.name}`)
-        })
-    }
+  if (mode.moved) {
+    teamspeak.on("clientmoved", (event) => {
+      handleMessage(
+        `${event.client.nickname} got moved to ${event.channel.name}`
+      );
+    });
+  }
 
-    teamspeak.on("close", async () => {
-        logger.debug("disconnected, trying to reconnect...")
-        await teamspeak.reconnect(5, 1000)
-        logger.info("reconnected!")
-    })
+  teamspeak.on("close", async () => {
+    logger.debug("disconnected, trying to reconnect...");
+    await teamspeak.reconnect(5, 1000);
+    logger.info("reconnected!");
+  });
 
-    teamspeak.on("error", (error: Error) => {
-        logger.error(`Error connecting to TS3 server: ${error.message}`)
-        process.exit(1)
-    })
-})
+  teamspeak.on("error", (error: Error) => {
+    logger.error(`Error connecting to TS3 server: ${error.message}`);
+    process.exit(1);
+  });
+});
diff --git a/src/env.ts b/src/env.ts
index b2d94f8..6277f55 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -1,18 +1,20 @@
 import { from } from "env-var";
 
+import type { LogLevel, Mode } from "./types";
+
 const envVar = from(process.env, {
-  asLogLevel: (value) => {
+  asLogLevel: (value): LogLevel => {
     const logLevels = ["error", "info", "debug"];
     if (logLevels.includes(value)) {
-      return value;
+      return value as LogLevel;
     } else {
       throw new Error("Invalid log level");
     }
   },
-  asTs3GotifyMode: (value) => {
+  asTs3GotifyMode: (value): Mode => {
     const modes = ["connect", "disconnect", "moved", "message"];
     if (modes.includes(value)) {
-      return value;
+      return value as Mode;
     } else {
       throw new Error("Invalid mode");
     }
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..b372a3b
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,3 @@
+export type Mode = "connect" | "disconnect" | "moved" | "message";
+
+export type LogLevel = "error" | "info" | "debug";