diff --git a/src/components/ai-assistant/blocks.js b/src/components/ai-assistant/blocks.ts
similarity index 98%
rename from src/components/ai-assistant/blocks.js
rename to src/components/ai-assistant/blocks.ts
index f5616f7..ff82087 100644
--- a/src/components/ai-assistant/blocks.js
+++ b/src/components/ai-assistant/blocks.ts
@@ -20,7 +20,7 @@ export const doc = (...blocks) => ({
 export const text = (value) => value && { type: 'text', text: value };
 
 /** A section label inside a response. */
-export const heading = (value, sub) => value && { type: 'heading', text: value, sub };
+export const heading = (value, sub?) => value && { type: 'heading', text: value, sub };
 
 /** Headline figures. `items: [{ label, value, delta?, sub?, tone? }]` */
 export const kpis = (items) => items?.length && { type: 'kpis', items };
diff --git a/src/components/ai-assistant/contexts.js b/src/components/ai-assistant/contexts.ts
similarity index 100%
rename from src/components/ai-assistant/contexts.js
rename to src/components/ai-assistant/contexts.ts
diff --git a/src/components/ai-assistant/dynamic.js b/src/components/ai-assistant/dynamic.ts
similarity index 100%
rename from src/components/ai-assistant/dynamic.js
rename to src/components/ai-assistant/dynamic.ts
diff --git a/src/components/ai-assistant/history.js b/src/components/ai-assistant/history.ts
similarity index 100%
rename from src/components/ai-assistant/history.js
rename to src/components/ai-assistant/history.ts
diff --git a/src/components/ai-assistant/insights.js b/src/components/ai-assistant/insights.ts
similarity index 98%
rename from src/components/ai-assistant/insights.js
rename to src/components/ai-assistant/insights.ts
index faea63d..1630aba 100644
--- a/src/components/ai-assistant/insights.js
+++ b/src/components/ai-assistant/insights.ts
@@ -15,7 +15,7 @@ import { PRIVILEGED_EVENTS, activitySignals } from '@/lib/activitySignals';
 
 export const pct = (n, d) => (d ? Math.round((n / d) * 100) : 0);
 
-export const plural = (n, word, irregular) =>
+export const plural = (n, word, irregular?) =>
   `${n} ${n === 1 ? word : irregular || `${word}s`}`;
 
 export const verb = (n, singular, plural_) => (n === 1 ? singular : plural_);
@@ -215,7 +215,7 @@ export function buildFacts({
     ),
     experienced: profiles.filter((p) => (p.experience_years || 0) >= 3),
     avgScore: avg(profiles.filter((p) => p.krow_score > 0).map((p) => p.krow_score)),
-    bands: Object.values(profiles.reduce((acc, p) => {
+    bands: Object.values(profiles.reduce<Record<string, { label: string; count: number }>>((acc, p) => {
       const { label } = getScoreBand(p.krow_score || 0);
       acc[label] ||= { label, count: 0 };
       acc[label].count += 1;
@@ -241,7 +241,9 @@ export function buildFacts({
     };
   });
 
-  const groupHires = (key) => Object.values(hires.reduce((acc, h) => {
+  const groupHires = (key) => Object.values(hires.reduce<Record<string, {
+    name: string; count: number; scores: any[]; days: any[]; ratings: any[];
+  }>>((acc, h) => {
     const name = h[key] || 'Unspecified';
     acc[name] ||= { name, count: 0, scores: [], days: [], ratings: [] };
     acc[name].count += 1;
diff --git a/src/components/ai-assistant/placement.js b/src/components/ai-assistant/placement.ts
similarity index 100%
rename from src/components/ai-assistant/placement.js
rename to src/components/ai-assistant/placement.ts
diff --git a/src/components/ai-assistant/provider.js b/src/components/ai-assistant/provider.ts
similarity index 100%
rename from src/components/ai-assistant/provider.js
rename to src/components/ai-assistant/provider.ts
diff --git a/src/components/ai-assistant/routing.js b/src/components/ai-assistant/routing.ts
similarity index 100%
rename from src/components/ai-assistant/routing.js
rename to src/components/ai-assistant/routing.ts
diff --git a/src/components/ai-assistant/uiEdit.js b/src/components/ai-assistant/uiEdit.ts
similarity index 100%
rename from src/components/ai-assistant/uiEdit.js
rename to src/components/ai-assistant/uiEdit.ts
diff --git a/src/components/ai-assistant/useAssistant.js b/src/components/ai-assistant/useAssistant.ts
similarity index 100%
rename from src/components/ai-assistant/useAssistant.js
rename to src/components/ai-assistant/useAssistant.ts
diff --git a/src/components/ai-assistant/viewport.js b/src/components/ai-assistant/viewport.ts
similarity index 100%
rename from src/components/ai-assistant/viewport.js
rename to src/components/ai-assistant/viewport.ts