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

open-sse/translator/helpers/claudeHelper.js

@@ -0,0 +1,179 @@
+// Claude helper functions for translator
+import { DEFAULT_THINKING_CLAUDE_SIGNATURE } from "../../config/defaultThinkingSignature.js";
+
+// Check if message has valid non-empty content
+export function hasValidContent(msg) {
+  if (typeof msg.content === "string" && msg.content.trim()) return true;
+  if (Array.isArray(msg.content)) {
+    return msg.content.some(block =>
+      (block.type === "text" && block.text?.trim()) ||
+      block.type === "tool_use" ||
+      block.type === "tool_result"
+    );
+  }
+  return false;
+}
+
+// Fix tool_use/tool_result ordering for Claude API
+// 1. Assistant message with tool_use: remove text AFTER tool_use (Claude doesn't allow)
+// 2. Merge consecutive same-role messages
+export function fixToolUseOrdering(messages) {
+  if (messages.length <= 1) return messages;
+  
+  // Pass 1: Fix assistant messages with tool_use - remove text after tool_use
+  for (const msg of messages) {
+    if (msg.role === "assistant" && Array.isArray(msg.content)) {
+      const hasToolUse = msg.content.some(b => b.type === "tool_use");
+      if (hasToolUse) {
+        // Keep only: thinking blocks + tool_use blocks (remove text blocks after tool_use)
+        const newContent = [];
+        let foundToolUse = false;
+        
+        for (const block of msg.content) {
+          if (block.type === "tool_use") {
+            foundToolUse = true;
+            newContent.push(block);
+          } else if (block.type === "thinking" || block.type === "redacted_thinking") {
+            newContent.push(block);
+          } else if (!foundToolUse) {
+            // Keep text blocks BEFORE tool_use
+            newContent.push(block);
+          }
+          // Skip text blocks AFTER tool_use
+        }
+        
+        msg.content = newContent;
+      }
+    }
+  }
+  
+  // Pass 2: Merge consecutive same-role messages
+  const merged = [];
+  
+  for (const msg of messages) {
+    const last = merged[merged.length - 1];
+    
+    if (last && last.role === msg.role) {
+      // Merge content arrays
+      const lastContent = Array.isArray(last.content) ? last.content : [{ type: "text", text: last.content }];
+      const msgContent = Array.isArray(msg.content) ? msg.content : [{ type: "text", text: msg.content }];
+      
+      // Put tool_result first, then other content
+      const toolResults = [...lastContent.filter(b => b.type === "tool_result"), ...msgContent.filter(b => b.type === "tool_result")];
+      const otherContent = [...lastContent.filter(b => b.type !== "tool_result"), ...msgContent.filter(b => b.type !== "tool_result")];
+      
+      last.content = [...toolResults, ...otherContent];
+    } else {
+      // Ensure content is array
+      const content = Array.isArray(msg.content) ? msg.content : [{ type: "text", text: msg.content }];
+      merged.push({ role: msg.role, content: [...content] });
+    }
+  }
+  
+  return merged;
+}
+
+// Prepare request for Claude format endpoints
+// - Cleanup cache_control
+// - Filter empty messages
+// - Add thinking block for Anthropic endpoint (provider === "claude")
+// - Fix tool_use/tool_result ordering
+export function prepareClaudeRequest(body, provider = null) {
+  // 1. System: remove all cache_control, add only to last block with ttl 1h
+  if (body.system && Array.isArray(body.system)) {
+    body.system = body.system.map((block, i) => {
+      const { cache_control, ...rest } = block;
+      if (i === body.system.length - 1) {
+        return { ...rest, cache_control: { type: "ephemeral", ttl: "1h" } };
+      }
+      return rest;
+    });
+  }
+
+  // 2. Messages: process in optimized passes
+  if (body.messages && Array.isArray(body.messages)) {
+    const len = body.messages.length;
+    let filtered = [];
+
+    // Pass 1: remove cache_control + filter empty messages
+    for (let i = 0; i < len; i++) {
+      const msg = body.messages[i];
+      
+      // Remove cache_control from content blocks
+      if (Array.isArray(msg.content)) {
+        for (const block of msg.content) {
+          delete block.cache_control;
+        }
+      }
+
+      // Keep final assistant even if empty, otherwise check valid content
+      const isFinalAssistant = i === len - 1 && msg.role === "assistant";
+      if (isFinalAssistant || hasValidContent(msg)) {
+        filtered.push(msg);
+      }
+    }
+
+    // Pass 1.5: Fix tool_use/tool_result ordering
+    // Each tool_use must have tool_result in the NEXT message (not same message with other content)
+    filtered = fixToolUseOrdering(filtered);
+
+    body.messages = filtered;
+
+    // Check if thinking is enabled AND last message is from user
+    const lastMessage = filtered[filtered.length - 1];
+    const lastMessageIsUser = lastMessage?.role === "user";
+    const thinkingEnabled = body.thinking?.type === "enabled" && lastMessageIsUser;
+
+    // Pass 2 (reverse): add cache_control to last assistant + handle thinking for Anthropic
+    let lastAssistantProcessed = false;
+    for (let i = filtered.length - 1; i >= 0; i--) {
+      const msg = filtered[i];
+      
+      if (msg.role === "assistant" && Array.isArray(msg.content)) {
+        // Add cache_control to last block of first (from end) assistant with content
+        if (!lastAssistantProcessed && msg.content.length > 0) {
+          msg.content[msg.content.length - 1].cache_control = { type: "ephemeral" };
+          lastAssistantProcessed = true;
+        }
+
+        // Handle thinking blocks for Anthropic endpoint only
+        if (provider === "claude") {
+          let hasToolUse = false;
+          let hasThinking = false;
+          
+          // Always replace signature for all thinking blocks
+          for (const block of msg.content) {
+            if (block.type === "thinking" || block.type === "redacted_thinking") {
+              block.signature = DEFAULT_THINKING_CLAUDE_SIGNATURE;
+              hasThinking = true;
+            }
+            if (block.type === "tool_use") hasToolUse = true;
+          }
+
+          // Add thinking block if thinking enabled + has tool_use but no thinking
+          if (thinkingEnabled && !hasThinking && hasToolUse) {
+            msg.content.unshift({
+              type: "thinking",
+              thinking: ".",
+              signature: DEFAULT_THINKING_CLAUDE_SIGNATURE
+            });
+          }
+        }
+      }
+    }
+  }
+
+  // 3. Tools: remove all cache_control, add only to last tool with ttl 1h
+  if (body.tools && Array.isArray(body.tools)) {
+    body.tools = body.tools.map((tool, i) => {
+      const { cache_control, ...rest } = tool;
+      if (i === body.tools.length - 1) {
+        return { ...rest, cache_control: { type: "ephemeral", ttl: "1h" } };
+      }
+      return rest;
+    });
+  }
+
+  return body;
+}
+