typed everything

src/components/LookUp.vue

···
 } from "@atcute/identity-resolver";
 import {AtpAgent} from "@atproto/api";
 
+// Types for fm.teal.alpha.feed.play
+interface PlayArtist {
+  artistMbId?: string;
+  artistName: string;
+}
+interface PlayValue {
+  $type?: "fm.teal.alpha.feed.play";
+  artists?: PlayArtist[];
+  // legacy support: earlier records may use artistNames
+  artistNames?: string[];
+  trackName: string;
+  playedTime?: string; // ISO string
+  releaseMbId?: string;
+  releaseName?: string;
+  recordingMbId?: string;
+  submissionClientAgent?: string;
+}
+interface ListRecord<T> {
+  uri: string;
+  cid: string;
+  value: T;
+}
+
 // handle resolution
 const handleResolver = new CompositeHandleResolver({
   strategy: "race",
···
     const doc = await docResolver.resolve(did);
     console.log(doc);
 
-    // const handler = simpleFetchHandler({ service: });
+    const endpoint = doc.service?.[0]?.serviceEndpoint as string | undefined;
+    if (!endpoint) {
+      throw new Error("could not resolve service endpoint for DID");
+    }
     const agent = new AtpAgent({
-      service: doc.service[0].serviceEndpoint as string,
+      service: endpoint,
     });
-    let cursor = "";
+    let cursor: string | undefined = undefined;
     let totalCount = 0;
     let inner_tracks: { name: string; artist: string; plays: number }[] = [];
     let inner_artists: { name: string; plays: number }[] = [];
···
       repo: did,
       collection: "fm.teal.alpha.feed.play",
       limit: 100,
-      cursor: cursor,
+      ...(cursor ? { cursor } : {}),
     });
 
     // Process pages incrementally while fetching them
     while (true) {
-      const records = response.data.records ?? [];
+      const records = (response.data.records as unknown as ListRecord<PlayValue>[]) ?? [];
       totalCount += records.length;
 
       for (const play of records) {
         // spot-check if play is valid
-        if (
-            play.value == undefined ||
-            play.value.artistName ||
-            play.value.trackName == undefined
-        ) {
+        if (!play.value || !play.value.trackName) {
           continue;
         }
         // Aggregate by artist(s)
···
             (a) => a.name === play.value.trackName,
         );
         if (!alreadyPlayed && play?.value) {
+          const primaryArtist = play.value.artists?.[0]?.artistName ?? play.value.artistNames?.[0] ?? "Unknown Artist";
           inner_tracks.push({
             name: play.value.trackName,
-            artist: play.value?.artists
-                ? play.value.artists[0].artistName
-                : play.value.artistNames[0],
+            artist: primaryArtist,
             plays: 1,
           });
         } else if (alreadyPlayed) {
···
         repo: did,
         collection: "fm.teal.alpha.feed.play",
         limit: 100,
-        cursor: cursor,
+        ...(cursor ? { cursor } : {}),
       });
     }
-  } catch (error) {
-    errorMessage.value = error.message;
+  } catch (error: unknown) {
+    errorMessage.value = error instanceof Error ? error.message : String(error);
     throw error;
   } finally {
     loading.value = false;