diff --git a/package.json b/package.json
index 3c1d6ac..d7ceb40 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "@types/react-dom": "16.0.2",
     "electron-packager": "^14.0.2",
     "ts-loader": "^2.0.3",
-    "typescript": "^2.2.2",
+    "typescript": "^4.2.4",
     "webpack": "^2.3.3"
   },
   "dependencies": {
diff --git a/src/components/Analyzer.tsx b/src/components/Analyzer.tsx
index addae88..49be38a 100644
--- a/src/components/Analyzer.tsx
+++ b/src/components/Analyzer.tsx
@@ -713,7 +713,6 @@ export class AnalyzerView extends React.Component<AnalyzerViewProps, {
 
     // Draw frameCanvas to displayCanvas
     (this.displayContext as any).imageSmoothingEnabled = false;
-    this.displayContext.mozImageSmoothingEnabled = false;
     let dw = this.frameSize.w * this.state.scale * this.ratio;
     let dh = this.frameSize.h * this.state.scale * this.ratio;
     if (this.state.showDecodedImage) {
@@ -750,7 +749,6 @@ export class AnalyzerView extends React.Component<AnalyzerViewProps, {
 
     this.zoomContext.clearRect(0, 0, dst.w, dst.h);
     if (this.state.showDecodedImage) {
-      this.zoomContext.mozImageSmoothingEnabled = false;
       (this.zoomContext as any).imageSmoothingEnabled = false;
       this.zoomContext.clearRect(dst.x, dst.y, dst.w, dst.h);
       this.zoomContext.drawImage(this.frameCanvas,
diff --git a/src/components/PlayerSplit.tsx b/src/components/PlayerSplit.tsx
index c3c1b99..cd3e093 100644
--- a/src/components/PlayerSplit.tsx
+++ b/src/components/PlayerSplit.tsx
@@ -35,6 +35,23 @@ interface PlayerSplitComponentProps {
   onVoted?: (vote: any) => void;
 }
 
+declare global {
+  interface Document {
+    mozCancelFullScreen?: () => Promise<void>;
+    msExitFullscreen?: () => Promise<void>;
+    webkitExitFullscreen?: () => Promise<void>;
+    mozFullScreenElement?: Element;
+    msFullscreenElement?: Element;
+    webkitFullscreenElement?: Element;
+  }
+
+  interface HTMLElement {
+    msRequestFullscreen?: () => Promise<void>;
+    mozRequestFullscreen?: () => Promise<void>;
+    webkitRequestFullscreen?: () => Promise<void>;
+  }
+}
+
 function generateUUID() { // Public Domain/MIT
   var d = new Date().getTime();
   if (typeof performance !== 'undefined' && typeof performance.now === 'function'){
@@ -173,8 +190,8 @@ export class PlayerSplitComponent extends React.Component<PlayerSplitComponentPr
     function exitFullscreen() {
       if(document.exitFullscreen) {
         document.exitFullscreen();
-      } else if((document as any).mozCancelFullScreen) {
-        (document as any).mozCancelFullScreen();
+      } else if(document.mozCancelFullScreen) {
+        document.mozCancelFullScreen();
       } else if(document.webkitExitFullscreen) {
         document.webkitExitFullscreen();
       }
diff --git a/src/components/analyzerTools.ts b/src/components/analyzerTools.ts
index e0d86f0..28adc16 100644
--- a/src/components/analyzerTools.ts
+++ b/src/components/analyzerTools.ts
@@ -714,7 +714,7 @@ export class Decoder {
           this.workerInfo = {
             buildConfig: e.data.payload.buildConfig
           }
-          resolve();
+          resolve(null);
         } else {
           reject(`Cannot load decoder, check url: ${url}`);
         }
diff --git a/tsconfig.json b/tsconfig.json
index 657c761..2c55d30 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,8 +1,6 @@
 {
     "compilerOptions": {
         "outDir": "./dist/",
-        "sourceMap": true,
-        "noImplicitAny": true,
         "module": "commonjs",
         "target": "es5",
         "jsx": "react",
@@ -16,5 +14,6 @@
     "exclude": [
         "node_modules",
         "release_builds"
-    ]
+    ],
+    "typeRoots": ["./node_modules/@types"]
 }