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Get Required API Keys\n\n**GitHub Token**: Create a fine-grained personal access token at https://github.com/settings/personal-access-tokens/new with:\n- Repository access: Select the specific repository you want to review\n- Permissions > Repository permissions:\n - **Metadata**: Read-only (required)\n - **Contents**: Read-only (required to fetch file contents)\n - **Pull requests**: Read and write (required to post review comments)\n\n**Anthropic API Key**: Get your API key from [Anthropic Console](https://console.anthropic.com/)\n\n### 2. Configure Environment Variables\n\nIn Val Town, set these environment variables:\n- `GITHUB_TOKEN`: Your GitHub personal access token\n- `ANTHROPIC_API_KEY`: Your Anthropic API key \n- `WEBHOOK_SECRET`: A random secret string (generate with: `openssl rand -hex 32`)\n\n### 3. Get Your Webhook URL\n\nYour webhook URL will be: `https://[your-username]--[val-id].web.val.run/webhook`\n\nYou can find this URL by clicking on your `index.ts` val in Val Town.\n\n### 4. Configure GitHub Webhook\n\nIn your GitHub repository:\n1. Go to **Settings** > **Webhooks** > **Add webhook**\n2. Set **Payload URL**: Your Val Town webhook URL (from step 3)\n3. Set **Content type**: `application/json`\n4. Set **Secret**: Same value as your `WEBHOOK_SECRET` environment variable\n5. Select **Let me select individual events** → Check **Pull requests**\n6. Ensure **Active** is checked\n7. Click **Add webhook**\n\n### 5. Test the Setup\n\nCreate a test pull request in your repository. The bot should:\n1. Post an initial \"review in progress\" comment\n2. Analyze the changed files\n3. Post a detailed review comment within 30-60 seconds\n\n## Usage\n\nThe bot automatically reviews pull requests when they are opened or reopened. It will:\n\n1. Fetch the changed files from the PR\n2. Analyze the code using Claude\n3. Post a review comment with findings\n\n## File Structure\n\n- `index.ts` - Main webhook handler and review logic\n- `github.ts` - GitHub API integration\n- `claude.ts` - Claude AI integration\n- `utils.ts` - Utility functions for webhook verification\n- `test.ts` - Test utilities for debugging\n\n## Troubleshooting\n\n### Bot Not Responding\n1. Check that your webhook URL is correct in GitHub settings\n2. Verify all environment variables are set in Val Town\n3. Check the webhook delivery logs in GitHub (Settings > Webhooks > Recent Deliveries)\n4. Look at the Val Town logs for error messages\n\n### Authentication Errors\n- Ensure your GitHub token has the correct permissions\n- Verify the token hasn't expired\n- Check that the repository is accessible with your token\n\n### Review Quality Issues\n- The bot analyzes up to 10 files per PR to stay within API limits\n- Only code files are reviewed (JS, TS, Python, etc.)\n- Very large files are truncated to prevent token limit issues\n\n### Webhook Signature Errors\n- Ensure the `WEBHOOK_SECRET` in Val Town matches the secret in GitHub\n- Check that the webhook is configured to send JSON payloads\n\n## Limitations\n\n- Reviews up to 10 files per PR\n- File content is truncated to 2000 characters for analysis\n- Only reviews code files (filters out documentation, images, etc.)\n- Requires internet access to GitHub and Anthropic APIs","deleted","label","children",[],[157],{"_105":176,"_96":177,"_158":178,"_160":-5,"_161":143,"_162":179,"_164":22,"_107":180,"_101":32,"_166":181,"_168":182,"_170":22,"_171":-5,"_172":183,"_99":184},"4d79415a-c61c-11f0-bd70-42dde27851f2","claude.ts","4d794254-c61c-11f0-bd70-42dde27851f2",5,["D",1763648530958],"script","interface FileChange {\n path: string;\n patch: string;\n content: string;\n status: string;\n}\n\ninterface PullRequestInfo {\n title: string;\n description: string;\n author: string;\n baseBranch: string;\n headBranch: string;\n}\n\n/**\n * Generate a code review using Claude AI\n */\nexport async function generateCodeReview(\n prInfo: PullRequestInfo,\n files: FileChange[]\n): Promise {\n const apiKey = Deno.env.get(\"ANTHROPIC_API_KEY\");\n \n if (!apiKey) {\n throw new Error(\"ANTHROPIC_API_KEY not configured\");\n }\n\n // Prepare the prompt with PR and file information\n const filesContent = files.map((file) => {\n return `## File: ${file.path}\n**Status**: ${file.status}\n\n### Changes (diff):\n\\`\\`\\`diff\n${file.patch}\n\\`\\`\\`\n\n### Current content (first 2000 chars):\n\\`\\`\\`\n${file.content.substring(0, 2000)}${file.content.length > 2000 ? \"\\n... (truncated)\" : \"\"}\n\\`\\`\\`\n`;\n }).join(\"\\n\\n\");\n\n const prompt = `Please review this pull request and provide constructive feedback.\n\n## Pull Request Information\n**Title**: ${prInfo.title}\n**Description**: ${prInfo.description || \"No description provided\"}\n**Author**: ${prInfo.author}\n**Branch**: ${prInfo.headBranch} → ${prInfo.baseBranch}\n\n## Changed Files (${files.length} files)\n${filesContent}\n\n## Review Guidelines\nPlease provide a thorough code review focusing on:\n\n1. **Code Quality**: Clean code principles, readability, maintainability\n2. **Security**: Potential security vulnerabilities or concerns\n3. **Performance**: Efficiency issues, potential bottlenecks\n4. **Best Practices**: Language-specific conventions and patterns\n5. **Logic & Bugs**: Potential logical errors or edge cases\n6. **Testing**: Suggestions for test coverage if applicable\n\nPlease structure your response as:\n- **Summary**: Brief overall assessment\n- **Strengths**: What's done well\n- **Issues Found**: Specific problems with file references\n- **Suggestions**: Recommendations for improvement\n- **Security Notes**: Any security considerations\n\nKeep the tone constructive and helpful. If the code looks good, say so!`;\n\n try {\n const response = await fetch(\"https://api.anthropic.com/v1/messages\", {\n method: \"POST\",\n headers: {\n \"Content-Type\": \"application/json\",\n \"x-api-key\": apiKey,\n \"anthropic-version\": \"2023-06-01\",\n },\n body: JSON.stringify({\n model: \"claude-3-5-sonnet-20241022\",\n max_tokens: 3000,\n messages: [\n {\n role: \"user\",\n content: prompt,\n },\n ],\n }),\n });\n\n if (!response.ok) {\n const errorText = await response.text();\n throw new Error(`Claude API error: ${response.status} - ${errorText}`);\n }\n\n const data = await response.json();\n \n if (data.content && data.content[0] && data.content[0].type === \"text\") {\n return data.content[0].text;\n } else {\n throw new Error(\"Unexpected response format from Claude API\");\n }\n } catch (error) {\n console.error(\"Claude API error:\", error);\n throw new Error(`Failed to generate review: ${error.message}`);\n }\n}",[],[177],{"_105":186,"_96":100,"_158":117,"_160":-5,"_161":143,"_162":187,"_164":22,"_107":188,"_101":189,"_166":190,"_168":191,"_170":22,"_171":-5,"_172":192,"_99":193},"80320172-c61c-11f0-bd10-42dde27851f2",13,["D",1763648616049],1,"http","/**\n * Debug endpoint to check configuration and test API connections\n */\nexport default async function(request: Request): Promise {\n const url = new URL(request.url);\n \n if (url.pathname === \"/test-github\" && request.method === \"GET\") {\n return await testGitHubConnection();\n }\n \n if (url.pathname === \"/test-claude\" && request.method === \"GET\") {\n return await testClaudeConnection();\n }\n \n // Main debug page\n const githubToken = Deno.env.get(\"GITHUB_TOKEN\");\n const anthropicKey = Deno.env.get(\"ANTHROPIC_API_KEY\");\n const webhookSecret = Deno.env.get(\"WEBHOOK_SECRET\");\n \n const status = {\n environment: {\n GITHUB_TOKEN: githubToken ? \"✅ Set\" : \"❌ Missing\",\n ANTHROPIC_API_KEY: anthropicKey ? \"✅ Set\" : \"❌ Missing\", \n WEBHOOK_SECRET: webhookSecret ? \"✅ Set\" : \"❌ Missing\"\n },\n endpoints: {\n \"Test GitHub API\": \"/test-github\",\n \"Test Claude API\": \"/test-claude\"\n },\n webhookUrl: `${url.origin}/webhook`\n };\n \n return new Response(JSON.stringify(status, null, 2), {\n headers: { \"Content-Type\": \"application/json\" }\n });\n}\n\nasync function testGitHubConnection(): Promise {\n const token = Deno.env.get(\"GITHUB_TOKEN\");\n \n if (!token) {\n return new Response(JSON.stringify({\n success: false,\n error: \"GITHUB_TOKEN not configured\"\n }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" }\n });\n }\n \n try {\n const response = await fetch(\"https://api.github.com/user\", {\n headers: {\n Authorization: `Bearer ${token}`,\n Accept: \"application/vnd.github.v3+json\",\n \"User-Agent\": \"CodeReviewBot/1.0\",\n },\n });\n \n if (response.ok) {\n const user = await response.json();\n return new Response(JSON.stringify({\n success: true,\n message: \"GitHub API connection successful\",\n user: {\n login: user.login,\n name: user.name,\n type: user.type\n }\n }, null, 2), {\n headers: { \"Content-Type\": \"application/json\" }\n });\n } else {\n return new Response(JSON.stringify({\n success: false,\n error: `GitHub API error: ${response.status} ${response.statusText}`\n }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" }\n });\n }\n } catch (error) {\n return new Response(JSON.stringify({\n success: false,\n error: `Connection failed: ${error.message}`\n }), {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" }\n });\n }\n}\n\nasync function testClaudeConnection(): Promise {\n const apiKey = Deno.env.get(\"ANTHROPIC_API_KEY\");\n \n if (!apiKey) {\n return new Response(JSON.stringify({\n success: false,\n error: \"ANTHROPIC_API_KEY not configured\"\n }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" }\n });\n }\n \n try {\n const response = await fetch(\"https://api.anthropic.com/v1/messages\", {\n method: \"POST\",\n headers: {\n \"Content-Type\": \"application/json\",\n \"x-api-key\": apiKey,\n \"anthropic-version\": \"2023-06-01\",\n },\n body: JSON.stringify({\n model: \"claude-3-5-sonnet-20241022\",\n max_tokens: 50,\n messages: [\n {\n role: \"user\",\n content: \"Say 'API test successful' if you can read this.\",\n },\n ],\n }),\n });\n\n if (response.ok) {\n const data = await response.json();\n const message = data.content?.[0]?.text || \"No response text\";\n \n return new Response(JSON.stringify({\n success: true,\n message: \"Claude API connection successful\",\n response: message\n }, null, 2), {\n headers: { \"Content-Type\": \"application/json\" }\n });\n } else {\n const errorText = await response.text();\n return new Response(JSON.stringify({\n success: false,\n error: `Claude API error: ${response.status} - ${errorText}`\n }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" }\n });\n }\n } catch (error) {\n return new Response(JSON.stringify({\n success: false,\n error: `Connection failed: ${error.message}`\n }), {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" }\n });\n }\n}",[],[100],{"_105":195,"_96":196,"_158":197,"_160":-5,"_161":143,"_162":198,"_164":22,"_107":199,"_101":32,"_166":181,"_168":200,"_170":22,"_171":-5,"_172":201,"_99":202},"5aa44014-c61c-11f0-be6b-42dde27851f2","github.ts","5aa440c8-c61c-11f0-be6b-42dde27851f2",6,["D",1763648553051],"import { generateCodeReview } from \"./claude.ts\";\nimport { shouldReviewFile, truncateText } from \"./utils.ts\";\n\ninterface GitHubFile {\n filename: string;\n status: string;\n patch?: string;\n sha: string;\n}\n\n/**\n * Main function to review a pull request\n */\nexport async function reviewPullRequest(payload: any): Promise {\n const githubToken = Deno.env.get(\"GITHUB_TOKEN\");\n \n if (!githubToken) {\n throw new Error(\"GITHUB_TOKEN not configured\");\n }\n\n const pr = payload.pull_request;\n const repo = payload.repository;\n \n console.log(`Reviewing PR #${pr.number} in ${repo.full_name}`);\n\n try {\n // Post initial comment to let users know review is starting\n await postComment(\n githubToken,\n repo.owner.login,\n repo.name,\n pr.number,\n \"🤖 Code review in progress... I'll analyze the changes and post my findings shortly!\"\n );\n\n // Get the list of changed files\n const changedFiles = await getChangedFiles(\n githubToken,\n repo.owner.login,\n repo.name,\n pr.base.sha,\n pr.head.sha\n );\n\n console.log(`Found ${changedFiles.length} changed files`);\n\n // Filter files that should be reviewed and limit to prevent API limits\n const filesToReview = changedFiles\n .filter(file => shouldReviewFile(file.filename) && file.status !== \"removed\")\n .slice(0, 10); // Limit to 10 files to avoid token limits\n\n if (filesToReview.length === 0) {\n await postComment(\n githubToken,\n repo.owner.login,\n repo.name,\n pr.number,\n \"🤖 No reviewable code files found in this PR. The changes appear to be documentation, configuration, or other non-code files.\"\n );\n return;\n }\n\n console.log(`Reviewing ${filesToReview.length} files`);\n\n // Get file contents for each file to review\n const filesWithContent = await Promise.all(\n filesToReview.map(async (file) => {\n try {\n const content = await getFileContent(\n githubToken,\n repo.owner.login,\n repo.name,\n file.filename,\n pr.head.sha\n );\n \n return {\n path: file.filename,\n patch: file.patch || \"\",\n content: content,\n status: file.status,\n };\n } catch (error) {\n console.error(`Failed to get content for ${file.filename}:`, error);\n return {\n path: file.filename,\n patch: file.patch || \"\",\n content: \"// Could not retrieve file content\",\n status: file.status,\n };\n }\n })\n );\n\n // Generate review using Claude\n console.log(\"Generating review with Claude...\");\n const review = await generateCodeReview(\n {\n title: pr.title,\n description: pr.body || \"\",\n author: pr.user.login,\n baseBranch: pr.base.ref,\n headBranch: pr.head.ref,\n },\n filesWithContent\n );\n\n // Post the review\n const reviewComment = `## 🤖 AI Code Review\n\n${review}\n\n---\n*Review generated by Claude AI • [Improve this review](https://github.com/${repo.full_name}/issues)*`;\n\n await postComment(\n githubToken,\n repo.owner.login,\n repo.name,\n pr.number,\n reviewComment\n );\n\n console.log(\"Review posted successfully!\");\n\n } catch (error) {\n console.error(\"Review failed:\", error);\n \n // Post error comment\n await postComment(\n githubToken,\n repo.owner.login,\n repo.name,\n pr.number,\n `🚨 Code review failed: ${error.message}\\n\\nPlease check the bot configuration and try again.`\n ).catch(console.error);\n }\n}\n\n/**\n * Get the list of changed files in a PR\n */\nasync function getChangedFiles(\n token: string,\n owner: string,\n repo: string,\n baseSha: string,\n headSha: string\n): Promise {\n const response = await fetch(\n `https://api.github.com/repos/${owner}/${repo}/compare/${baseSha}...${headSha}`,\n {\n headers: {\n Authorization: `Bearer ${token}`,\n Accept: \"application/vnd.github.v3+json\",\n \"User-Agent\": \"CodeReviewBot/1.0\",\n },\n }\n );\n\n if (!response.ok) {\n throw new Error(`Failed to get changed files: ${response.status} ${response.statusText}`);\n }\n\n const data = await response.json();\n return data.files || [];\n}\n\n/**\n * Get the content of a specific file\n */\nasync function getFileContent(\n token: string,\n owner: string,\n repo: string,\n path: string,\n sha: string\n): Promise {\n const response = await fetch(\n `https://api.github.com/repos/${owner}/${repo}/contents/${path}?ref=${sha}`,\n {\n headers: {\n Authorization: `Bearer ${token}`,\n Accept: \"application/vnd.github.v3+json\",\n \"User-Agent\": \"CodeReviewBot/1.0\",\n },\n }\n );\n\n if (!response.ok) {\n throw new Error(`Failed to get file content: ${response.status} ${response.statusText}`);\n }\n\n const data = await response.json();\n \n if (data.content) {\n // Decode base64 content\n return atob(data.content.replace(/\\n/g, \"\"));\n }\n \n return \"\";\n}\n\n/**\n * Post a comment on a GitHub issue/PR\n */\nasync function postComment(\n token: string,\n owner: string,\n repo: string,\n issueNumber: number,\n body: string\n): Promise {\n const response = await fetch(\n `https://api.github.com/repos/${owner}/${repo}/issues/${issueNumber}/comments`,\n {\n method: \"POST\",\n headers: {\n Authorization: `Bearer ${token}`,\n Accept: \"application/vnd.github.v3+json\",\n \"Content-Type\": \"application/json\",\n \"User-Agent\": \"CodeReviewBot/1.0\",\n },\n body: JSON.stringify({ body }),\n }\n );\n\n if (!response.ok) {\n const errorText = await response.text();\n throw new Error(`Failed to post comment: ${response.status} ${response.statusText} - ${errorText}`);\n }\n}",[],[196],{"_105":204,"_96":205,"_158":206,"_160":-5,"_161":143,"_162":102,"_164":22,"_107":207,"_101":123,"_166":190,"_168":208,"_170":22,"_171":-5,"_172":209,"_99":210},"878a105e-c61c-11f0-988c-42dde27851f2","index.ts","3f0005e6-c61c-11f0-9ca6-42dde27851f2",["D",1763648628372],"import { verifyWebhookSignature } from \"./utils.ts\";\nimport { reviewPullRequest } from \"./github.ts\";\n\nexport default async function(request: Request): Promise {\n const url = new URL(request.url);\n \n // Health check endpoint\n if (url.pathname === \"/\" && request.method === \"GET\") {\n return new Response(\n `Code Review Bot 🤖\n\n✅ Bot is running\n📍 Webhook endpoint: ${url.origin}/webhook\n🔧 Debug endpoint: ${url.origin.replace('/index.ts', '/debug.ts')}\n\nConfigure GitHub webhook to POST /webhook`,\n { headers: { \"Content-Type\": \"text/plain\" } }\n );\n }\n\n // Test webhook endpoint (for debugging)\n if (url.pathname === \"/webhook\" && request.method === \"GET\") {\n return new Response(\n JSON.stringify({\n message: \"Webhook endpoint is ready\",\n method: \"POST required\",\n contentType: \"application/json\",\n headers: {\n required: [\"x-github-event\", \"x-hub-signature-256\"],\n optional: [\"x-github-delivery\"]\n }\n }, null, 2),\n { headers: { \"Content-Type\": \"application/json\" } }\n );\n }\n\n // Webhook endpoint\n if (url.pathname === \"/webhook\" && request.method === \"POST\") {\n try {\n const signature = request.headers.get(\"x-hub-signature-256\");\n const body = await request.text();\n const webhookSecret = Deno.env.get(\"WEBHOOK_SECRET\");\n\n if (!webhookSecret) {\n console.error(\"WEBHOOK_SECRET not configured\");\n return new Response(\"Server configuration error\", { status: 500 });\n }\n\n // Verify webhook signature\n if (!signature || !(await verifyWebhookSignature(body, signature, webhookSecret))) {\n console.error(\"Invalid webhook signature\");\n return new Response(\"Invalid signature\", { status: 401 });\n }\n\n const event = request.headers.get(\"x-github-event\");\n const contentType = request.headers.get(\"content-type\") || \"\";\n\n // Parse payload (GitHub can send as JSON or form-encoded)\n let payload;\n if (contentType.includes(\"application/json\")) {\n payload = JSON.parse(body);\n } else {\n // Handle form-encoded payload\n const params = new URLSearchParams(body);\n payload = JSON.parse(params.get(\"payload\") || \"{}\");\n }\n\n // Handle opened and reopened PRs\n if (\n event === \"pull_request\" &&\n (payload.action === \"opened\" || payload.action === \"reopened\")\n ) {\n console.log(`Starting review for PR #${payload.pull_request.number}`);\n \n // Start the review process (don't await to return quickly)\n reviewPullRequest(payload).catch((error) => {\n console.error(\"Review failed:\", error);\n });\n \n return new Response(\n JSON.stringify({ message: \"Review started\" }),\n { \n headers: { \"Content-Type\": \"application/json\" },\n status: 200 \n }\n );\n }\n\n return new Response(\n JSON.stringify({ message: \"Event ignored\" }),\n { \n headers: { \"Content-Type\": \"application/json\" },\n status: 200 \n }\n );\n\n } catch (error) {\n console.error(\"Webhook processing error:\", error);\n return new Response(\"Internal server error\", { status: 500 });\n }\n }\n\n return new Response(\"Not found\", { status: 404 });\n}",[],[205],{"_105":212,"_96":213,"_158":214,"_160":-5,"_161":143,"_162":189,"_164":119,"_107":215,"_101":32,"_166":181,"_168":73,"_170":22,"_171":-5,"_172":216,"_99":217},"c9ee2e40-c61b-11f0-b02f-42dde27851f2","main.ts","c9ee2ecc-c61b-11f0-b02f-42dde27851f2",["D",1763648310268],[],[213],{"_105":219,"_96":220,"_158":221,"_160":-5,"_161":143,"_162":222,"_164":119,"_107":223,"_101":189,"_166":190,"_168":224,"_170":22,"_171":-5,"_172":225,"_99":226},"6381dec6-c61c-11f0-889a-42dde27851f2","test.ts","6262d176-c61c-11f0-a522-42dde27851f2",9,["D",1763648567920],"import { verifyWebhookSignature } from \"./utils.ts\";\n\n// Test webhook signature verification\nexport default async function(): Promise {\n const testPayload = '{\"test\": \"payload\"}';\n const testSecret = \"test-secret\";\n \n // Generate expected signature\n const encoder = new TextEncoder();\n const key = await crypto.subtle.importKey(\n \"raw\",\n encoder.encode(testSecret),\n { name: \"HMAC\", hash: \"SHA-256\" },\n false,\n [\"sign\"],\n );\n\n const signatureBytes = await crypto.subtle.sign(\n \"HMAC\",\n key,\n encoder.encode(testPayload),\n );\n \n const signature = \"sha256=\" + Array.from(new Uint8Array(signatureBytes))\n .map((b) => b.toString(16).padStart(2, \"0\"))\n .join(\"\");\n\n // Test verification\n const isValid = await verifyWebhookSignature(testPayload, signature, testSecret);\n const isInvalid = await verifyWebhookSignature(testPayload, \"sha256=invalid\", testSecret);\n\n return new Response(JSON.stringify({\n validSignature: isValid,\n invalidSignature: isInvalid,\n expectedSignature: signature\n }, null, 2), {\n headers: { \"Content-Type\": \"application/json\" }\n });\n}",[],[220],{"_105":228,"_96":229,"_158":230,"_160":-5,"_161":143,"_162":231,"_164":22,"_107":232,"_101":32,"_166":181,"_168":233,"_170":22,"_171":-5,"_172":234,"_99":235},"4403e814-c61c-11f0-bf3e-42dde27851f2","utils.ts","4403e8c8-c61c-11f0-bf3e-42dde27851f2",4,["D",1763648515090],"/**\n * Verify GitHub webhook signature using HMAC-SHA256\n */\nexport async function verifyWebhookSignature(\n payload: string,\n signature: string,\n secret: string,\n): Promise {\n const encoder = new TextEncoder();\n \n // Import the secret as a key for HMAC\n const key = await crypto.subtle.importKey(\n \"raw\",\n encoder.encode(secret),\n { name: \"HMAC\", hash: \"SHA-256\" },\n false,\n [\"sign\"],\n );\n\n // Sign the payload\n const signatureBytes = await crypto.subtle.sign(\n \"HMAC\",\n key,\n encoder.encode(payload),\n );\n \n // Convert to hex string with sha256= prefix\n const expected =\n \"sha256=\" +\n Array.from(new Uint8Array(signatureBytes))\n .map((b) => b.toString(16).padStart(2, \"0\"))\n .join(\"\");\n\n return signature === expected;\n}\n\n/**\n * Truncate text to a maximum length with ellipsis\n */\nexport function truncateText(text: string, maxLength: number): string {\n if (text.length <= maxLength) {\n return text;\n }\n return text.substring(0, maxLength - 3) + \"...\";\n}\n\n/**\n * Extract file extension from filename\n */\nexport function getFileExtension(filename: string): string {\n const parts = filename.split(\".\");\n return parts.length > 1 ? parts[parts.length - 1].toLowerCase() : \"\";\n}\n\n/**\n * Check if a file should be reviewed based on its extension\n */\nexport function shouldReviewFile(filename: string): boolean {\n const reviewableExtensions = [\n \"js\", \"ts\", \"jsx\", \"tsx\", \"py\", \"java\", \"cpp\", \"c\", \"cs\", \"php\", \n \"rb\", \"go\", \"rs\", \"swift\", \"kt\", \"scala\", \"clj\", \"hs\", \"ml\", \"fs\",\n \"vue\", \"svelte\", \"html\", \"css\", 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