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docs(gemini): replace type assertions with runtime narrowing in interactions examples #743

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28 changes: 16 additions & 12 deletions docs/adapters/gemini.md
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Original file line number Diff line number Diff line change
Expand Up @@ -122,10 +122,7 @@ The `geminiTextInteractions` adapter routes through `client.interactions.create`

```typescript
import { chat } from "@tanstack/ai";
import {
geminiTextInteractions,
type GeminiInteractionsCustomEventValue,
} from "@tanstack/ai-gemini/experimental";
import { geminiTextInteractions } from "@tanstack/ai-gemini/experimental";

// Turn 1: introduce yourself, capture the interaction id.
let interactionId: string | undefined;
Expand Down Expand Up @@ -199,7 +196,6 @@ export async function POST({ request }: { request: Request }) {
```tsx
import { useEffect, useMemo, useState } from "react";
import { fetchServerSentEvents, useChat } from "@tanstack/ai-react";
import type { GeminiInteractionsCustomEventValue } from "@tanstack/ai-gemini/experimental";

function GeminiChat() {
const [interactionId, setInteractionId] = useState<string | undefined>();
Expand All @@ -213,11 +209,13 @@ function GeminiChat() {
connection: fetchServerSentEvents("/api/chat"),
body,
onCustomEvent: (eventType, data) => {
if (eventType === "gemini.interactionId") {
const value = data as
| GeminiInteractionsCustomEventValue<"gemini.interactionId">
| undefined;
if (value?.interactionId) setInteractionId(value.interactionId);
if (
eventType === "gemini.interactionId" &&
typeof data === "object" &&
data !== null &&
"interactionId" in data
) {
setInteractionId(String(data.interactionId));
}
},
});
Expand Down Expand Up @@ -287,8 +285,14 @@ The server's interaction id arrives as an AG-UI `CUSTOM` event emitted just befo

```typescript
for await (const chunk of stream) {
if (chunk.type === "CUSTOM" && chunk.name === "gemini.interactionId") {
const id = (chunk.value as { interactionId: string }).interactionId;
if (
chunk.type === "CUSTOM" &&
chunk.name === "gemini.interactionId" &&
typeof chunk.value === "object" &&
chunk.value !== null &&
"interactionId" in chunk.value
) {
const id = String(chunk.value.interactionId);
// Persist `id` wherever you store per-user conversation pointers —
// pass it back on the next turn as `previous_interaction_id`.
}
Expand Down