Update jsconfig.json and package.json to correct open-sse path references from relative to local directory.

open-sse/services/combo.js

@@ -0,0 +1,69 @@
+/**
+ * Shared combo (model combo) handling with fallback support
+ */
+
+/**
+ * Get combo models from combos data
+ * @param {string} modelStr - Model string to check
+ * @param {Array|Object} combosData - Array of combos or object with combos
+ * @returns {string[]|null} Array of models or null if not a combo
+ */
+export function getComboModelsFromData(modelStr, combosData) {
+  // Don't check if it's in provider/model format
+  if (modelStr.includes("/")) return null;
+  
+  // Handle both array and object formats
+  const combos = Array.isArray(combosData) ? combosData : (combosData?.combos || []);
+  
+  const combo = combos.find(c => c.name === modelStr);
+  if (combo && combo.models && combo.models.length > 0) {
+    return combo.models;
+  }
+  return null;
+}
+
+/**
+ * Handle combo chat with fallback
+ * @param {Object} options
+ * @param {Object} options.body - Request body
+ * @param {string[]} options.models - Array of model strings to try
+ * @param {Function} options.handleSingleModel - Function to handle single model: (body, modelStr) => Promise<Response>
+ * @param {Object} options.log - Logger object
+ * @returns {Promise<Response>}
+ */
+export async function handleComboChat({ body, models, handleSingleModel, log }) {
+  let lastError = null;
+
+  for (let i = 0; i < models.length; i++) {
+    const modelStr = models[i];
+    log.info("COMBO", `Trying model ${i + 1}/${models.length}: ${modelStr}`);
+
+    const result = await handleSingleModel(body, modelStr);
+    
+    // Success (2xx) - return response
+    if (result.ok) {
+      return result;
+    }
+
+    // 401 unauthorized - return immediately (auth error)
+    if (result.status === 401) {
+      return result;
+    }
+
+    // 4xx/5xx - try next model
+    lastError = `${modelStr}: ${result.statusText || result.status}`;
+    log.warn("COMBO", `Model failed, trying next`, { model: modelStr, status: result.status });
+  }
+
+  log.warn("COMBO", "All models failed");
+  
+  // Return 503 with last error
+  return new Response(
+    JSON.stringify({ error: lastError || "All combo models unavailable" }),
+    { 
+      status: 503, 
+      headers: { "Content-Type": "application/json" }
+    }
+  );
+}
+