diff --git a/packages/media/src/test/isAnimatedGif.ts b/packages/media/src/test/isAnimatedGif.ts
index 9c2b05bbc3df..b74d7335f35c 100644
--- a/packages/media/src/test/isAnimatedGif.ts
+++ b/packages/media/src/test/isAnimatedGif.ts
@@ -32,7 +32,7 @@ describe('isAnimatedGif', () => {
       buffer.byteOffset,
       buffer.byteOffset + buffer.byteLength
     );
-    const result = isAnimatedGif(arrayBuffer);
+    const result = isAnimatedGif(arrayBuffer as unknown as ArrayBuffer);
 
     expect(result).toBeTrue();
   });
@@ -43,7 +43,7 @@ describe('isAnimatedGif', () => {
       buffer.byteOffset,
       buffer.byteOffset + buffer.byteLength
     );
-    const result = isAnimatedGif(arrayBuffer);
+    const result = isAnimatedGif(arrayBuffer as unknown as ArrayBuffer);
 
     expect(result).toBeFalse();
   });
diff --git a/packages/rich-text/src/utils/getCaretCharacterOffsetWithin.ts b/packages/rich-text/src/utils/getCaretCharacterOffsetWithin.ts
index 12ba29adfaee..7e46be0dcd67 100644
--- a/packages/rich-text/src/utils/getCaretCharacterOffsetWithin.ts
+++ b/packages/rich-text/src/utils/getCaretCharacterOffsetWithin.ts
@@ -44,7 +44,11 @@ interface CaretPosition {
 }
 
 interface SelectionDocument extends Document {
-  caretPositionFromPoint?: (x: number, y: number) => CaretPosition | null;
+  caretPositionFromPoint: (
+    x: number,
+    y: number,
+    options?: CaretPositionFromPointOptions
+  ) => CaretPosition | null;
 }
 
 // Extend for wider browser support.
diff --git a/packages/story-editor/src/app/canvas/useCanvasKeys.ts b/packages/story-editor/src/app/canvas/useCanvasKeys.ts
index 33fc4c88a9ae..b0134effd6c6 100644
--- a/packages/story-editor/src/app/canvas/useCanvasKeys.ts
+++ b/packages/story-editor/src/app/canvas/useCanvasKeys.ts
@@ -179,7 +179,7 @@ function useCanvasKeys(ref: RefObject<Node>) {
   // Position (x/y) key handler.
   useGlobalKeyDownEffect(
     { key: ['up', 'down', 'left', 'right'], shift: true },
-    ({ key, shiftKey }) => {
+    ({ key, shiftKey }: KeyboardEvent) => {
       if (isEditing || !selectedElements?.length) {
         return;
       }
@@ -204,7 +204,7 @@ function useCanvasKeys(ref: RefObject<Node>) {
   // Layer up/down.
   useGlobalKeyDownEffect(
     { key: ['mod+up', 'mod+down', 'mod+left', 'mod+right'], shift: true },
-    (evt) => {
+    (evt: KeyboardEvent) => {
       const { key, shiftKey } = evt;
 
       // Cancel the default behavior of the event: it's very jarring to run
@@ -293,7 +293,7 @@ function useCanvasKeys(ref: RefObject<Node>) {
   ].includes(animationState);
   useGlobalKeyDownEffect(
     { key: ['mod+enter'] },
-    (evt) => {
+    (evt: KeyboardEvent) => {
       evt.preventDefault();
       if (currentPageNumber === 1) {
         return;
@@ -313,7 +313,7 @@ function useCanvasKeys(ref: RefObject<Node>) {
 
   useGlobalKeyDownEffect(
     { key: ['mod+k'] },
-    (evt) => {
+    (evt: KeyboardEvent) => {
       evt.preventDefault();
       if (
         !selectedElements.length ||
diff --git a/packages/story-editor/src/app/media/utils/heif/utils.ts b/packages/story-editor/src/app/media/utils/heif/utils.ts
index db379ee986a0..f92f74e5d5c1 100644
--- a/packages/story-editor/src/app/media/utils/heif/utils.ts
+++ b/packages/story-editor/src/app/media/utils/heif/utils.ts
@@ -60,7 +60,7 @@ export async function decodeImage(image: DecodeResult) {
         if (!result) {
           reject(new Error('HEIF processing error'));
         } else {
-          resolve(result.data.buffer);
+          resolve(result.data.buffer as ArrayBuffer);
         }
       }
     );
diff --git a/packages/story-editor/src/app/media/utils/useFFmpeg.ts b/packages/story-editor/src/app/media/utils/useFFmpeg.ts
index a52efbb9c766..d865d21ca009 100644
--- a/packages/story-editor/src/app/media/utils/useFFmpeg.ts
+++ b/packages/story-editor/src/app/media/utils/useFFmpeg.ts
@@ -205,7 +205,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type: MEDIA_POSTER_IMAGE_MIME_TYPE }),
+          new Blob([data.buffer as BlobPart], { type: MEDIA_POSTER_IMAGE_MIME_TYPE }),
           outputFileName,
           MEDIA_POSTER_IMAGE_MIME_TYPE
         );
@@ -263,7 +263,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type: MEDIA_TRANSCODED_MIME_TYPE }),
+          new Blob([data.buffer as BlobPart], { type: MEDIA_TRANSCODED_MIME_TYPE }),
           outputFileName,
           MEDIA_TRANSCODED_MIME_TYPE
         );
@@ -348,7 +348,7 @@ function useFFmpeg() {
           .map((outputFile) => {
             const data = (ffmpeg as FFmpeg).FS('readFile', outputFile);
             return blobToFile(
-              new Blob([data.buffer], { type }),
+              new Blob([data.buffer as BlobPart], { type }),
               outputFile,
               type
             );
@@ -417,7 +417,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type }),
+          new Blob([data.buffer as BlobPart], { type }),
           outputFileName,
           type
         );
@@ -478,7 +478,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type }),
+          new Blob([data.buffer as BlobPart], { type }),
           outputFileName,
           type
         );
@@ -538,7 +538,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type }),
+          new Blob([data.buffer as BlobPart], { type }),
           outputFileName,
           type
         );
@@ -596,7 +596,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type: MEDIA_TRANSCODED_MIME_TYPE }),
+          new Blob([data.buffer as BlobPart], { type: MEDIA_TRANSCODED_MIME_TYPE }),
           outputFileName,
           MEDIA_TRANSCODED_MIME_TYPE
         );
@@ -651,7 +651,7 @@ function useFFmpeg() {
         const data = ffmpeg.FS('readFile', tempFileName);
 
         return blobToFile(
-          new Blob([data.buffer], { type: 'audio/mpeg' }),
+          new Blob([data.buffer as BlobPart], { type: 'audio/mpeg' }),
           outputFileName,
           'audio/mpeg'
         );
diff --git a/packages/story-editor/src/components/footer/carousel/carouselContext/useCarouselKeys.ts b/packages/story-editor/src/components/footer/carousel/carouselContext/useCarouselKeys.ts
index f85c5999d38d..b7506c69c681 100644
--- a/packages/story-editor/src/components/footer/carousel/carouselContext/useCarouselKeys.ts
+++ b/packages/story-editor/src/components/footer/carousel/carouselContext/useCarouselKeys.ts
@@ -70,7 +70,7 @@ function useCarouselKeys({
   useKeyDownEffect(
     listElement,
     { key: ['up', 'down', 'left', 'right'] },
-    ({ key }) => {
+    ({ key }: KeyboardEvent) => {
       // Intercept all keys, but only handle left and right.
       const dir = getArrowDir(key, 'ArrowRight', 'ArrowLeft', isRTL);
       if (dir === 0) {
@@ -103,7 +103,7 @@ function useCarouselKeys({
   useKeyDownEffect(
     listElement,
     { key: ['mod+up', 'mod+down', 'mod+left', 'mod+right'], shift: true },
-    (evt) => {
+    (evt: KeyboardEvent) => {
       const { key, shiftKey } = evt;
 
       // Cancel the default behavior of the event: it's very jarring to run