Fix frontend imports and track frontend lib files

frontend/lib/tencentSse.ts

@@ -0,0 +1,77 @@
+export type SseEvent = {
+  event: string;
+  data: string;
+};
+
+export type TencentReplyEvent = {
+  type?: "reply";
+  payload?: {
+    content?: string;
+    is_evil?: boolean;
+    is_final?: boolean;
+    is_from_self?: boolean;
+    is_llm_generated?: boolean;
+  };
+};
+
+export type TencentErrorEvent = {
+  type?: "error";
+  error?: {
+    code?: number;
+    message?: string;
+  };
+  message?: string;
+  status?: number;
+};
+
+export function parseJsonSafely<T>(value: string): T | null {
+  try {
+    return JSON.parse(value) as T;
+  } catch {
+    return null;
+  }
+}
+
+export function splitSseEvents(buffer: string): {
+  events: SseEvent[];
+  rest: string;
+} {
+  const blocks = buffer.split(/\r?\n\r?\n/);
+  const rest = blocks.pop() ?? "";
+  const events = blocks
+    .map(parseSseEventBlock)
+    .filter((event): event is SseEvent => event !== null);
+
+  return { events, rest };
+}
+
+function parseSseEventBlock(block: string): SseEvent | null {
+  const lines = block.split(/\r?\n/);
+  let eventName = "message";
+  const dataLines: string[] = [];
+
+  for (const rawLine of lines) {
+    const line = rawLine.trimEnd();
+    if (!line || line.startsWith(":")) {
+      continue;
+    }
+
+    if (line.startsWith("event:")) {
+      eventName = line.slice(6).trim();
+      continue;
+    }
+
+    if (line.startsWith("data:")) {
+      dataLines.push(line.slice(5).trimStart());
+    }
+  }
+
+  if (dataLines.length === 0) {
+    return null;
+  }
+
+  return {
+    event: eventName,
+    data: dataLines.join("\n"),
+  };
+}