minor fixes

Author: ljw1004

index.ts

@@ -194,7 +194,7 @@ function delta(prev: unknown, next: unknown): [unknown, boolean] {
     for (const k of [...prevKeys].filter(k => nextKeys.has(k)).sort()) {
       const [sub, same] = delta(prev[k], next[k]);
       if (same) {
-        const raw = JSON.stringify(next[k]);
+        const raw = JSON.stringify(next[k]) ?? '';
         out[k] =
           raw.length < 128
             ? next[k]
@@ -249,8 +249,8 @@ function delta(prev: unknown, next: unknown): [unknown, boolean] {
     let right: Array<readonly [unknown, string]> = next.slice(i).map(v => [v, hash(v)] as const);
     const add: unknown[] = [];
     const del: unknown[] = [];
-    for (const [value, hash] of left) {
-      const ix = right.findIndex(item => item[1] === hash);
+    for (const [value, sig] of left) {
+      const ix = right.findIndex(item => item[1] === sig);
       if (ix === -1) {
         del.push(value);
         continue;

viewer.js

@@ -118,15 +118,16 @@ function renderPayload(elements) {
     const eMessage = deltaField(e, 'message') ?? deltaField(e, 'delta');
     const eName = deltaField(e, 'name');
     const eType = deltaField(e, 'type');
+    const eRole = deltaField(e, 'role');
     const marker = deltaMarker(e);
     if (e === '...' || e === '...*' || e === '---') {
       continue;
-    } else if (eMessage && typeof eMessage === 'object') {
-      // OpenAI chat-completion choices wrap the assistant message in here
+    } else if (eMessage && typeof eMessage === 'object' && !Array.isArray(eMessage)) {
+      // OpenAI chat-completion choices wrap the assistant message in an object here.
       payload.push(...renderPayload([eMessage]));
     } else if (
       eType === 'message' ||
-      (eType === undefined && e.role !== undefined && eContent !== undefined)
+      (eType === undefined && eRole !== undefined && eContent !== undefined)
     ) {
       const contents = Array.isArray(eContent) ? eContent : [eContent];
       contents.forEach(content => {
@@ -135,7 +136,7 @@ function renderPayload(elements) {
         }
         const text = contentText(Array.isArray(eContent) ? [content] : content);
         payload.push({
-          [TITLE]: `${marker}message(${esc(e.role)}): `,
+          [TITLE]: `${marker}message(${esc(eRole)}): `,
           [INLINE]: esc(short(text)),
           body: text,
         });
@@ -166,7 +167,7 @@ function renderPayload(elements) {
         const raw = eType === 'function_call' ? JSON.parse(eArguments) : eInput;
         const rawArg = raw?.cmd ?? raw?.pattern ?? raw;
         arg = typeof rawArg === 'string' ? rawArg : JSON.stringify(rawArg ?? '');
-      } catch (e) {
+      } catch {
         arg = '...';
       }
       payload.push({