refactor: extract shared SSE parser and add eslint to iknowyou

Deduplicate SSE chunk parsing from input-bar.tsx and vllm.ts into a
shared lib/sse.ts consumeSSEChunk helper. Add eslint + next lint config.
Silence monorepo lockfile warning via outputFileTracingRoot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

applications/iknowyou/.eslintrc.json

@@ -0,0 +1,3 @@
+{
+  "extends": "next/core-web-vitals"
+}

applications/iknowyou/components/chat/input-bar.tsx

@@ -2,6 +2,7 @@
 
 import { useRef, useCallback } from "react";
 import { useChatStore } from "@/lib/store";
+import { consumeSSEChunk } from "@/lib/sse";
 
 export function InputBar() {
   const textareaRef = useRef<HTMLTextAreaElement>(null);
@@ -58,17 +59,15 @@ export function InputBar() {
         const { done, value } = await reader.read();
         if (done) break;
 
-        buffer += decoder.decode(value, { stream: true });
-        const lines = buffer.split("\n");
-        buffer = lines.pop()!;
-
-        for (const line of lines) {
-          const trimmed = line.trim();
-          if (!trimmed.startsWith("data: ") || trimmed === "data: [DONE]")
-            continue;
+        const { jsonLines, buffer: next } = consumeSSEChunk(
+          buffer,
+          decoder.decode(value, { stream: true })
+        );
+        buffer = next;
 
+        for (const jsonStr of jsonLines) {
           try {
-            const data = JSON.parse(trimmed.slice(6));
+            const data = JSON.parse(jsonStr);
             if (data.error) {
               setError(data.error);
               return;

applications/iknowyou/lib/sse.ts

@@ -0,0 +1,27 @@
+/**
+ * Append a decoded SSE chunk to the running buffer and extract complete data lines.
+ *
+ * Returns the raw JSON strings from each `data: {...}` line and the updated
+ * buffer (partial-line remainder). Skips the `[DONE]` sentinel.
+ *
+ * Both the vLLM server-side reader and the client-side chat reader share
+ * this logic — keeping buffer management in one place prevents drift when
+ * the SSE wire format changes.
+ */
+export function consumeSSEChunk(
+  buffer: string,
+  chunk: string
+): { jsonLines: string[]; buffer: string } {
+  const full = buffer + chunk;
+  const parts = full.split("\n");
+  const newBuffer = parts.pop()!;
+  const jsonLines: string[] = [];
+
+  for (const part of parts) {
+    const trimmed = part.trim();
+    if (!trimmed.startsWith("data: ") || trimmed === "data: [DONE]") continue;
+    jsonLines.push(trimmed.slice(6));
+  }
+
+  return { jsonLines, buffer: newBuffer };
+}

applications/iknowyou/lib/vllm.ts

@@ -1,4 +1,5 @@
 import type { CommunicationBrief } from "./types";
+import { consumeSSEChunk } from "./sse";
 
 const VLLM_BASE = process.env.VLLM_URL ?? "http://msd5685.mjhst.com:8000";
 const MODEL = "Qwen/Qwen3-8B";
@@ -147,17 +148,15 @@ export async function* streamChat(
       const { done, value } = await reader.read();
       if (done) break;
 
-      buffer += decoder.decode(value, { stream: true });
-      const lines = buffer.split("\n");
-      buffer = lines.pop()!;
-
-      for (const line of lines) {
-        const trimmed = line.trim();
-        if (!trimmed.startsWith("data: ") || trimmed === "data: [DONE]")
-          continue;
+      const { jsonLines, buffer: next } = consumeSSEChunk(
+        buffer,
+        decoder.decode(value, { stream: true })
+      );
+      buffer = next;
 
+      for (const jsonStr of jsonLines) {
         try {
-          const chunk = JSON.parse(trimmed.slice(6));
+          const chunk = JSON.parse(jsonStr);
           const token = chunk.choices?.[0]?.delta?.content;
           if (token) yield token;
         } catch {

applications/iknowyou/next.config.ts

@@ -1,5 +1,10 @@
 import type { NextConfig } from "next";
+import path from "path";
 
-const nextConfig: NextConfig = {};
+const nextConfig: NextConfig = {
+  // Silence the "multiple lockfiles" warning — this project lives inside a
+  // larger monorepo and has its own lockfile by design.
+  outputFileTracingRoot: path.join(__dirname, "../../"),
+};
 
 export default nextConfig;

applications/iknowyou/package.json

@@ -7,7 +7,8 @@
     "dev:engine": "cargo run -p iknowyou-engine --bin server --features synap-aux",
     "dev:all": "sh -c 'npm run dev:engine & npm run dev'",
     "build": "next build",
-    "start": "next start -p 59521"
+    "start": "next start -p 59521",
+    "lint": "next lint"
   },
   "dependencies": {
     "next": "^15.3.3",
@@ -20,6 +21,8 @@
     "@types/node": "^22.15.21",
     "@types/react": "^19.1.4",
     "@types/react-dom": "^19.1.5",
+    "eslint": "^8.57.1",
+    "eslint-config-next": "^15.5.12",
     "tailwindcss": "^4.1.8",
     "typescript": "^5.8.3"
   }