diff --git a/packages/techdocs-common/src/stages/publish/types.ts b/packages/techdocs-common/src/stages/publish/types.ts
index f68cb9cc8f..ab497067b3 100644
--- a/packages/techdocs-common/src/stages/publish/types.ts
+++ b/packages/techdocs-common/src/stages/publish/types.ts
@@ -32,13 +32,19 @@ export type PublishRequest = {
   directory: string;
 };
 
-/* `remoteUrl` is the URL which serves files from the local publisher's static directory. */
+/**
+ * Response containing metadata about where files were published and what may
+ * have been published or updated.
+ */
 export type PublishResponse = {
+  /**
+   * The URL which serves files from the local publisher's static directory.
+   */
   remoteUrl?: string;
   /**
    * The list of objects (specifically their paths) that were published.
-   * Objects should not have a preceding slash, and should match how one would
-   * load the object over the `/static/docs/` TechDocs Backend Plugin endpoint.
+   * Objects do not have a preceding slash, and match how one would load the
+   * object over the `/static/docs/*` TechDocs Backend Plugin endpoint.
    */
   objects?: string[];
 } | void;
diff --git a/plugins/techdocs-backend/src/DocsBuilder/builder.ts b/plugins/techdocs-backend/src/DocsBuilder/builder.ts
index 4843acf2c2..1d725bd69e 100644
--- a/plugins/techdocs-backend/src/DocsBuilder/builder.ts
+++ b/plugins/techdocs-backend/src/DocsBuilder/builder.ts
@@ -221,7 +221,7 @@ export class DocsBuilder {
     });
 
     // Invalidate the cache for any published objects.
-    if (this.cache && published?.objects?.length) {
+    if (this.cache && published && published?.objects?.length) {
       await this.cache.invalidateMultiple(published.objects);
     }
 
diff --git a/plugins/techdocs-backend/src/cache/cacheMiddleware.ts b/plugins/techdocs-backend/src/cache/cacheMiddleware.ts
index 2abbb24cf3..2650b39296 100644
--- a/plugins/techdocs-backend/src/cache/cacheMiddleware.ts
+++ b/plugins/techdocs-backend/src/cache/cacheMiddleware.ts
@@ -100,7 +100,7 @@ export const createCacheMiddleware = ({
     // Monkey-patch the response's socket to keep track of chunks as they are
     // written over the wire.
     socket.write = (
-      data,
+      data: string | Uint8Array,
       encoding?: BufferEncoding | ErrorCallback,
       callback?: ErrorCallback,
     ) => {