diff --git a/src/content.ts b/src/content.ts
index cded9c45..a94032a9 100644
--- a/src/content.ts
+++ b/src/content.ts
@@ -12,6 +12,7 @@ import PreviewBar from "./js-components/previewBar";
 import SkipNotice from "./render/SkipNotice";
 import SkipNoticeComponent from "./components/SkipNoticeComponent";
 import SubmissionNotice from "./render/SubmissionNotice";
+import { Message, MessageResponse } from "./messageTypes";
 
 // Hack to get the CSS loaded on permission-based sites (Invidious)
 utils.wait(() => Config.config !== null, 5000, 10).then(addCSS);
@@ -27,7 +28,7 @@ let sponsorVideoID: VideoID = null;
 // JSON video info 
 let videoInfo: any = null;
 //the channel this video is about
-let channelID;
+let channelID: string;
 
 // Skips are scheduled to ensure precision.
 // Skips are rescheduled every seeking event.
@@ -112,7 +113,7 @@ const skipNoticeContentContainer: ContentContainer = () => ({
 //get messages from the background script and the popup
 chrome.runtime.onMessage.addListener(messageListener);
   
-function messageListener(request: any, sender: any, sendResponse: (response: any) => void): void {
+function messageListener(request: Message, sender: unknown, sendResponse: (response: MessageResponse) => void): void {
     //messages from popup script
     switch(request.message){
         case "update":
@@ -169,7 +170,6 @@ function messageListener(request: any, sender: any, sendResponse: (response: any
             break;
         case "submitTimes":
             submitSponsorTimes();
-
             break;
     }
 }
@@ -1209,7 +1209,7 @@ function updateSponsorTimesSubmitting(getFromConfig = true) {
     }
 }
 
-async function changeStartSponsorButton(showStartSponsor, uploadButtonVisible) {
+async function changeStartSponsorButton(showStartSponsor: boolean, uploadButtonVisible: boolean): Promise<boolean> {
     if(!sponsorVideoID) return false;
     
     //if it isn't visible, there is no data
@@ -1410,7 +1410,7 @@ function dontShowNoticeAgain() {
     closeAllSkipNotices();
 }
 
-function sponsorMessageStarted(callback) {
+function sponsorMessageStarted(callback: (response: MessageResponse) => void) {
     video = document.querySelector('video');
 
     //send back current time
diff --git a/src/messageTypes.ts b/src/messageTypes.ts
new file mode 100644
index 00000000..cd1914a8
--- /dev/null
+++ b/src/messageTypes.ts
@@ -0,0 +1,63 @@
+//
+// Message and Response Types
+//
+
+import { SponsorTime } from "./types";
+
+interface BaseMessage {
+    from?: string;
+}
+
+interface DefaultMessage {
+    message: 
+        "update"
+        | "sponsorStart"
+        | "sponsorDataChanged"
+        | "isInfoFound"
+        | "getVideoID"
+        | "getChannelID"
+        | "isChannelWhitelisted"
+        | "submitTimes";
+}
+
+interface BoolValueMessage {
+    message: "whitelistChange";
+    value: boolean;
+}
+
+interface ChangeStartSponsorButtonMessage {
+    message: "changeStartSponsorButton";
+    showStartSponsor: boolean;
+    uploadButtonVisible: boolean;
+}
+
+export type Message = BaseMessage & (DefaultMessage | BoolValueMessage | ChangeStartSponsorButtonMessage);
+
+interface IsInfoFoundMessageResponse {
+    found: boolean;
+    sponsorTimes: SponsorTime[];
+}
+
+interface GetVideoIdResponse {
+    videoID: string;
+}
+
+interface GetChannelIDResponse {
+    channelID: string;
+}
+
+interface SponsorStartResponse {
+    time: number;
+}
+
+interface IsChannelWhitelistedResponse {
+    value: boolean;
+}
+
+export type MessageResponse = 
+    IsInfoFoundMessageResponse
+    | GetVideoIdResponse
+    | GetChannelIDResponse
+    | SponsorStartResponse
+    | IsChannelWhitelistedResponse;
+
diff --git a/src/popup.ts b/src/popup.ts
index 1ccc7cae..cda3f140 100644
--- a/src/popup.ts
+++ b/src/popup.ts
@@ -2,11 +2,12 @@ import Config from "./config";
 
 import Utils from "./utils";
 import { SponsorTime, SponsorHideType } from "./types";
+import { Message, MessageResponse } from "./messageTypes";
 const utils = new Utils();
 
 interface MessageListener {
-    (request: any, sender: any, callback: (response: any) => void): void;
-} 
+    (request: Message, sender: unknown, sendResponse: (response: MessageResponse) => void): void;
+}
 
 class MessageHandler {
     messageListener: MessageListener;
@@ -15,7 +16,7 @@ class MessageHandler {
         this.messageListener = messageListener;
     }
 
-    sendMessage(id: number, request, callback?) {
+    sendMessage(id: number, request: Message, callback?) {
         if (this.messageListener) {
             this.messageListener(request, null, callback);
         } else {
diff --git a/src/types.ts b/src/types.ts
index d7818e01..0a3be890 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -3,7 +3,7 @@ import SkipNoticeComponent from "./components/SkipNoticeComponent";
 
 interface ContentContainer {
     (): {
-        vote: (type: any, UUID: any, category?: string, skipNotice?: SkipNoticeComponent) => void,
+        vote: (type: number, UUID: string, category?: string, skipNotice?: SkipNoticeComponent) => void,
         dontShowNoticeAgain: () => void,
         unskipSponsorTime: (segment: SponsorTime) => void,
         sponsorTimes: SponsorTime[],
@@ -15,9 +15,9 @@ interface ContentContainer {
         onMobileYouTube: boolean,
         sponsorSubmissionNotice: SubmissionNotice,
         resetSponsorSubmissionNotice: () => void,
-        changeStartSponsorButton: (showStartSponsor: any, uploadButtonVisible: any) => Promise<boolean>,
+        changeStartSponsorButton: (showStartSponsor: boolean, uploadButtonVisible: boolean) => Promise<boolean>,
         previewTime: (time: number, unpause?: boolean) => void,
-        videoInfo: any,
+        videoInfo: VideoInfo,
         getRealCurrentTime: () => number
     }
 }