diff --git a/package.json b/package.json
index a9d8f31..ca00e3a 100644
--- a/package.json
+++ b/package.json
@@ -102,6 +102,7 @@
     "@types/lodash.get": "^4.4.6",
     "@types/lodash.set": "^4.3.6",
     "@types/node": "^15.6.0",
+    "@types/normalize-wheel": "^1.0.0",
     "@types/react": "^17.0.6",
     "@types/react-dom": "^17.0.5",
     "@types/react-modal": "^3.12.0",
diff --git a/src/components/map/MapEditor.tsx b/src/components/map/MapEditor.tsx
index de4efdf..3de53ba 100644
--- a/src/components/map/MapEditor.tsx
+++ b/src/components/map/MapEditor.tsx
@@ -23,6 +23,8 @@ import MapGrid from "./MapGrid";
 import MapGridEditor from "./MapGridEditor";
 import { Map } from "../../types/Map";
 import { GridInset } from "../../types/Grid";
+import { Stage as StageType } from "konva/types/Stage";
+import { Layer as LayerType } from "konva/types/Layer";
 
 type MapSettingsChangeEventHandler = (change: Partial<Map>) => void;
 
@@ -41,8 +43,8 @@ function MapEditor({ map, onSettingsChange }: MapEditorProps) {
   const defaultInset = getGridDefaultInset(map.grid, map.width, map.height);
 
   const stageTranslateRef = useRef({ x: 0, y: 0 });
-  const mapStageRef = useRef();
-  const mapLayerRef = useRef();
+  const mapStageRef = useRef<StageType>(null);
+  const mapLayerRef = useRef<LayerType>(null);
   const [preventMapInteraction, setPreventMapInteraction] = useState(false);
 
   function handleResize(width?: number, height?: number): void {
@@ -55,7 +57,7 @@ function MapEditor({ map, onSettingsChange }: MapEditorProps) {
     }
   }
 
-  const containerRef = useRef(null);
+  const containerRef = useRef<HTMLDivElement>(null);
   usePreventOverscroll(containerRef);
 
   const [mapWidth, mapHeight] = useImageCenter(
diff --git a/src/contexts/AssetsContext.tsx b/src/contexts/AssetsContext.tsx
index 8f2266c..1b4fea4 100644
--- a/src/contexts/AssetsContext.tsx
+++ b/src/contexts/AssetsContext.tsx
@@ -309,7 +309,7 @@ type DefaultData = {
 export function useDataURL(
   data: FileData | DefaultData,
   defaultSources: Record<string, string>,
-  unknownSource: string | undefined,
+  unknownSource: string | undefined = undefined,
   thumbnail = false
 ) {
   const [assetId, setAssetId] = useState<string>();
diff --git a/src/contexts/GroupContext.tsx b/src/contexts/GroupContext.tsx
index 1916268..8a38923 100644
--- a/src/contexts/GroupContext.tsx
+++ b/src/contexts/GroupContext.tsx
@@ -7,7 +7,7 @@ import { useKeyboard, useBlur } from "./KeyboardContext";
 import { getGroupItems, groupsFromIds } from "../helpers/group";
 
 import shortcuts from "../shortcuts";
-import { Group, GroupContainer, GroupItem } from "../types/Group";
+import { Group, GroupItem } from "../types/Group";
 
 export type GroupSelectMode = "single" | "multiple" | "range";
 export type GroupSelectModeChangeEventHandler = (
diff --git a/src/contexts/MapStageContext.tsx b/src/contexts/MapStageContext.tsx
index 684b297..81893dd 100644
--- a/src/contexts/MapStageContext.tsx
+++ b/src/contexts/MapStageContext.tsx
@@ -1,7 +1,7 @@
 import React, { useContext } from "react";
 import { Stage } from "konva/types/Stage";
 
-type MapStage = React.MutableRefObject<Stage | null>;
+export type MapStage = React.MutableRefObject<Stage | null>;
 
 const MapStageContext = React.createContext<MapStage | undefined>(undefined);
 export const MapStageProvider = MapStageContext.Provider;
diff --git a/src/hooks/useDebounce.tsx b/src/hooks/useDebounce.ts
similarity index 100%
rename from src/hooks/useDebounce.tsx
rename to src/hooks/useDebounce.ts
diff --git a/src/hooks/useGridSnapping.tsx b/src/hooks/useGridSnapping.ts
similarity index 100%
rename from src/hooks/useGridSnapping.tsx
rename to src/hooks/useGridSnapping.ts
diff --git a/src/hooks/useImageCenter.tsx b/src/hooks/useImageCenter.ts
similarity index 68%
rename from src/hooks/useImageCenter.tsx
rename to src/hooks/useImageCenter.ts
index e8a86f6..9830ca6 100644
--- a/src/hooks/useImageCenter.tsx
+++ b/src/hooks/useImageCenter.ts
@@ -1,26 +1,24 @@
+import { Layer } from "konva/types/Layer";
 import { useEffect, useRef } from "react";
 
-type useImageCenterProps = {
-  data: 
-  stageRef: 
-  stageWidth: number;
-  stageHeight: number;
-  stageTranslateRef:
-  setStageScale:
-  imageLayerRef:
-  containerRef: 
-  responsive?: boolean
-}
+import { MapStage } from "../contexts/MapStageContext";
+import Vector2 from "../helpers/Vector2";
+
+type ImageData = {
+  id: string;
+  width: number;
+  height: number;
+};
 
 function useImageCenter(
-  data,
-  stageRef,
-  stageWidth,
-  stageHeight,
-  stageTranslateRef,
-  setStageScale,
-  imageLayerRef,
-  containerRef,
+  data: ImageData,
+  stageRef: MapStage,
+  stageWidth: number,
+  stageHeight: number,
+  stageTranslateRef: React.MutableRefObject<Vector2>,
+  setStageScale: React.Dispatch<React.SetStateAction<number>>,
+  imageLayerRef: React.RefObject<Layer>,
+  containerRef: React.RefObject<HTMLDivElement>,
   responsive = false
 ) {
   const stageRatio = stageWidth / stageHeight;
@@ -37,7 +35,7 @@ function useImageCenter(
   }
 
   // Reset image translate and stage scale
-  const previousDataIdRef = useRef();
+  const previousDataIdRef = useRef<string>();
   const previousStageRatioRef = useRef(stageRatio);
   useEffect(() => {
     if (!data) {
@@ -45,7 +43,12 @@ function useImageCenter(
     }
 
     const layer = imageLayerRef.current;
-    const containerRect = containerRef.current.getBoundingClientRect();
+    const container = containerRef.current;
+    const stage = stageRef.current;
+    if (!container || !stage) {
+      return;
+    }
+    const containerRect = container.getBoundingClientRect();
     const previousDataId = previousDataIdRef.current;
     const previousStageRatio = previousStageRatioRef.current;
 
@@ -68,7 +71,7 @@ function useImageCenter(
         };
       }
       layer.position(newTranslate);
-      stageRef.current.position({ x: 0, y: 0 });
+      stage.position({ x: 0, y: 0 });
       stageTranslateRef.current = { x: 0, y: 0 };
 
       setStageScale(1);
diff --git a/src/hooks/useImageDrop.tsx b/src/hooks/useImageDrop.ts
similarity index 100%
rename from src/hooks/useImageDrop.tsx
rename to src/hooks/useImageDrop.ts
diff --git a/src/hooks/useMapImage.tsx b/src/hooks/useMapImage.ts
similarity index 65%
rename from src/hooks/useMapImage.tsx
rename to src/hooks/useMapImage.ts
index 02cf5b6..89b7720 100644
--- a/src/hooks/useMapImage.tsx
+++ b/src/hooks/useMapImage.ts
@@ -5,14 +5,16 @@ import { useDataURL } from "../contexts/AssetsContext";
 
 import { mapSources as defaultMapSources } from "../maps";
 
-function useMapImage(map) {
+import { Map } from "../types/Map";
+
+function useMapImage(map: Map) {
   const mapURL = useDataURL(map, defaultMapSources);
-  const [mapImage, mapImageStatus] = useImage(mapURL);
+  const [mapImage, mapImageStatus] = useImage(mapURL || "");
 
   // Create a map source that only updates when the image is fully loaded
-  const [loadedMapImage, setLoadedMapImage] = useState();
+  const [loadedMapImage, setLoadedMapImage] = useState<HTMLImageElement>();
   useEffect(() => {
-    if (mapImageStatus === "loaded") {
+    if (mapImageStatus === "loaded" && mapImage) {
       setLoadedMapImage(mapImage);
     }
   }, [mapImage, mapImageStatus]);
diff --git a/src/hooks/useNetworkedState.tsx b/src/hooks/useNetworkedState.ts
similarity index 100%
rename from src/hooks/useNetworkedState.tsx
rename to src/hooks/useNetworkedState.ts
diff --git a/src/hooks/usePortal.js b/src/hooks/usePortal.ts
similarity index 79%
rename from src/hooks/usePortal.js
rename to src/hooks/usePortal.ts
index cb8c2f9..d9c3499 100644
--- a/src/hooks/usePortal.js
+++ b/src/hooks/usePortal.ts
@@ -6,7 +6,7 @@ import { useRef, useEffect } from "react";
  * Creates DOM element to be used as React root.
  * @returns {HTMLElement}
  */
-function createRootElement(id) {
+function createRootElement(id: string) {
   const rootContainer = document.createElement("div");
   rootContainer.setAttribute("id", id);
   return rootContainer;
@@ -16,11 +16,13 @@ function createRootElement(id) {
  * Appends element as last child of body.
  * @param {HTMLElement} rootElem
  */
-function addRootElement(rootElem) {
-  document.body.insertBefore(
-    rootElem,
-    document.body.lastElementChild.nextElementSibling
-  );
+function addRootElement(rootElem: HTMLElement) {
+  if (document.body.lastElementChild) {
+    document.body.insertBefore(
+      rootElem,
+      document.body.lastElementChild?.nextElementSibling
+    );
+  }
 }
 
 /**
@@ -34,13 +36,15 @@ function addRootElement(rootElem) {
  * @param {String} id The id of the target container, e.g 'modal' or 'spotlight'
  * @returns {HTMLElement} The DOM node to use as the Portal target.
  */
-function usePortal(id) {
-  const rootElemRef = useRef(null);
+function usePortal(id: string): HTMLElement {
+  const rootElemRef = useRef<HTMLElement | null>(null);
 
   useEffect(
     function setupElement() {
       // Look for existing target dom element to append to
-      const existingParent = document.querySelector(`#${id}`);
+      const existingParent: HTMLElement | null = document.querySelector(
+        `#${id}`
+      );
       // Parent is either a new root or the existing dom element
       const parentElem = existingParent || createRootElement(id);
 
@@ -50,10 +54,10 @@ function usePortal(id) {
       }
 
       // Add the detached element to the parent
-      parentElem.appendChild(rootElemRef.current);
+      rootElemRef.current && parentElem.appendChild(rootElemRef.current);
 
       return function removeElement() {
-        rootElemRef.current.remove();
+        rootElemRef.current && rootElemRef.current.remove();
         if (parentElem.childNodes.length === -1) {
           parentElem.remove();
         }
diff --git a/src/hooks/usePreventOverscroll.js b/src/hooks/usePreventOverscroll.ts
similarity index 74%
rename from src/hooks/usePreventOverscroll.js
rename to src/hooks/usePreventOverscroll.ts
index 73cd602..b0c74c6 100644
--- a/src/hooks/usePreventOverscroll.js
+++ b/src/hooks/usePreventOverscroll.ts
@@ -1,10 +1,10 @@
-import { useEffect } from "react";
+import React, { useEffect } from "react";
 
-function usePreventOverscroll(elementRef) {
+function usePreventOverscroll(elementRef: React.RefObject<HTMLElement>) {
   useEffect(() => {
     // Stop overscroll on chrome and safari
     // also stop pinch to zoom on chrome
-    function preventOverscroll(event) {
+    function preventOverscroll(event: WheelEvent) {
       event.preventDefault();
     }
     const element = elementRef.current;
diff --git a/src/hooks/usePreventSelect.js b/src/hooks/usePreventSelect.ts
similarity index 67%
rename from src/hooks/usePreventSelect.js
rename to src/hooks/usePreventSelect.ts
index 82d36bd..7737fa9 100644
--- a/src/hooks/usePreventSelect.js
+++ b/src/hooks/usePreventSelect.ts
@@ -1,11 +1,8 @@
 function usePreventSelect() {
   function clearSelection() {
-    if (window.getSelection) {
-      window.getSelection().removeAllRanges();
-    }
-    if (document.selection) {
-      document.selection.empty();
-    }
+    window?.getSelection()?.removeAllRanges();
+    // @ts-ignore
+    document?.selection?.empty();
   }
   function preventSelect() {
     clearSelection();
diff --git a/src/hooks/usePreventTouch.js b/src/hooks/usePreventTouch.ts
similarity index 78%
rename from src/hooks/usePreventTouch.js
rename to src/hooks/usePreventTouch.ts
index b101e4b..137b80f 100644
--- a/src/hooks/usePreventTouch.js
+++ b/src/hooks/usePreventTouch.ts
@@ -1,9 +1,9 @@
 import { useEffect } from "react";
 
-function usePreventTouch(elementRef) {
+function usePreventTouch(elementRef: React.RefObject<HTMLElement>) {
   useEffect(() => {
     // Stop 3d touch
-    function prevent3DTouch(event) {
+    function prevent3DTouch(event: TouchEvent) {
       event.preventDefault();
     }
     const element = elementRef.current;
diff --git a/src/hooks/usePrevious.js b/src/hooks/usePrevious.ts
similarity index 68%
rename from src/hooks/usePrevious.js
rename to src/hooks/usePrevious.ts
index 8b8ac74..2c621c2 100644
--- a/src/hooks/usePrevious.js
+++ b/src/hooks/usePrevious.ts
@@ -1,7 +1,7 @@
 import { useEffect, useRef } from "react";
 
-function usePrevious(value) {
-  const ref = useRef();
+function usePrevious<T>(value: T): T {
+  const ref = useRef<T>(value);
   useEffect(() => {
     ref.current = value;
   }, [value]);
diff --git a/src/hooks/useResponsiveLayout.js b/src/hooks/useResponsiveLayout.ts
similarity index 100%
rename from src/hooks/useResponsiveLayout.js
rename to src/hooks/useResponsiveLayout.ts
diff --git a/src/hooks/useStageInteraction.js b/src/hooks/useStageInteraction.ts
similarity index 85%
rename from src/hooks/useStageInteraction.js
rename to src/hooks/useStageInteraction.ts
index a35d69c..bba35a4 100644
--- a/src/hooks/useStageInteraction.js
+++ b/src/hooks/useStageInteraction.ts
@@ -1,35 +1,42 @@
 import { useRef, useEffect, useState } from "react";
 import { useGesture } from "react-use-gesture";
+import { Handlers } from "react-use-gesture/dist/types";
 import normalizeWheel from "normalize-wheel";
+import { Stage } from "konva/types/Stage";
+import { Layer } from "konva/types/Layer";
 
 import { useKeyboard, useBlur } from "../contexts/KeyboardContext";
 
 import shortcuts from "../shortcuts";
 
+import Vector2 from "../helpers/Vector2";
+
 const wheelZoomSpeed = -1;
 const touchZoomSpeed = 0.005;
 const minZoom = 0.1;
 
+type StageScaleChangeEventHandler = (newScale: number) => void;
+
 function useStageInteraction(
-  stage,
-  stageScale,
-  onStageScaleChange,
-  stageTranslateRef,
-  layer,
+  stage: Stage,
+  stageScale: number,
+  onStageScaleChange: StageScaleChangeEventHandler,
+  stageTranslateRef: React.MutableRefObject<Vector2>,
+  layer: Layer,
   maxZoom = 10,
   tool = "move",
   preventInteraction = false,
-  gesture = {}
+  gesture: Handlers = {}
 ) {
   const isInteractingWithCanvas = useRef(false);
-  const pinchPreviousDistanceRef = useRef();
-  const pinchPreviousOriginRef = useRef();
+  const pinchPreviousDistanceRef = useRef<number>(0);
+  const pinchPreviousOriginRef = useRef<Vector2>({ x: 0, y: 0 });
 
   const [zoomSpeed, setZoomSpeed] = useState(1);
 
   // Prevent accessibility pinch to zoom on Mac
   useEffect(() => {
-    function handleGesture(e) {
+    function handleGesture(e: Event) {
       e.preventDefault();
     }
     window.addEventListener("gesturestart", handleGesture);
@@ -69,16 +76,18 @@ function useStageInteraction(
 
           // Center on pointer
           const pointer = stage.getPointerPosition();
-          const newTranslate = {
-            x: pointer.x - ((pointer.x - stage.x()) / stageScale) * newScale,
-            y: pointer.y - ((pointer.y - stage.y()) / stageScale) * newScale,
-          };
+          if (pointer) {
+            const newTranslate = {
+              x: pointer.x - ((pointer.x - stage.x()) / stageScale) * newScale,
+              y: pointer.y - ((pointer.y - stage.y()) / stageScale) * newScale,
+            };
 
-          stage.position(newTranslate);
+            stage.position(newTranslate);
 
-          stageTranslateRef.current = newTranslate;
+            stageTranslateRef.current = newTranslate;
 
-          onStageScaleChange(newScale);
+            onStageScaleChange(newScale);
+          }
         }
 
         gesture.onWheel && gesture.onWheel(props);
@@ -186,7 +195,7 @@ function useStageInteraction(
     }
   );
 
-  function handleKeyDown(event) {
+  function handleKeyDown(event: KeyboardEvent) {
     // TODO: Find better way to detect whether keyboard event should fire.
     // This one fires on all open stages
     if (preventInteraction) {
@@ -222,7 +231,7 @@ function useStageInteraction(
     }
   }
 
-  function handleKeyUp(event) {
+  function handleKeyUp(event: KeyboardEvent) {
     if (shortcuts.stagePrecisionZoom(event)) {
       setZoomSpeed(1);
     }
diff --git a/yarn.lock b/yarn.lock
index ecef399..98d0666 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3038,6 +3038,11 @@
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
   integrity sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==
 
+"@types/normalize-wheel@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@types/normalize-wheel/-/normalize-wheel-1.0.0.tgz#d973b53557dc59c6136b5b737ae930e9218cb452"
+  integrity sha512-SzWYVzP7Q8w4/976Gi3a6+J/8/VNTq6AW7wDafXorr1MYTxyZqJTbUvwQt1hiG3PXyFUMIKr+s6q3+MLz2c/TQ==
+
 "@types/offscreencanvas@~2019.3.0":
   version "2019.3.0"
   resolved "https://registry.yarnpkg.com/@types/offscreencanvas/-/offscreencanvas-2019.3.0.tgz#3336428ec7e9180cf4566dfea5da04eb586a6553"