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fix(data-mapper): improve type safety for date handling in chat data import
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‎.devlog/entries/283-fix-chat-data-import-failing-with-lastdate-toisost.json‎

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{
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"id": 283,
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"key": "fix-chat-data-import-failing-with-lastdate-toisost",
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"title": "Fix: Chat data import failing with \"lastDate.toISOString is not a function\" error",
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"type": "bugfix",
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"description": "Chat data import is failing with a TypeError indicating that lastDate.toISOString is not a function. This suggests a type mismatch where the code expects a Date object but is receiving a different type (likely a string or undefined) during the import of 394 chat sessions.",
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"status": "done",
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"priority": "medium",
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"createdAt": "2025-07-27T14:03:41.110Z",
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"updatedAt": "2025-07-27T14:07:21.124Z",
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"notes": [
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{
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"id": "07de0d88-e008-4c2f-967d-ab0eafab2208",
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"timestamp": "2025-07-27T14:04:32.131Z",
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"category": "progress",
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"content": "ISSUE ANALYSIS: Found the root cause in packages/cli/src/utils/data-mapper.ts at line 54-55. The code assumes lastDate is either a string or Date object, but it can be null/undefined. The type checking logic is flawed - when aiSession.metadata?.lastMessageDate is undefined, it falls back to aiSession.timestamp (Date), but if both are undefined/null, toISOString() fails."
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},
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{
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"id": "310db091-7714-4e7a-be8d-f6e0f4ab9331",
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"timestamp": "2025-07-27T14:05:32.957Z",
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"category": "solution",
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"content": "SOLUTION IMPLEMENTED: Fixed three potential type safety issues in data-mapper.ts:\n\n1. Line 54-58 (updatedAt field): Added null check before calling toISOString(), fallback to currentTime if no date available\n2. Line 43-46 (timestamp field): Added optional chaining and fallback to currentTime for aiSession.timestamp\n3. Line 82-85 (message timestamp): Added optional chaining and fallback to new Date().toISOString() for aiMessage.timestamp\n\nAll changes maintain backward compatibility while preventing runtime errors when Date objects are undefined/null.",
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"files": [
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"packages/cli/src/utils/data-mapper.ts"
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]
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},
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{
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"id": "5e3220da-42d2-49cb-b3a9-d6b90abdf3ae",
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"timestamp": "2025-07-27T14:07:15.049Z",
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"category": "solution",
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"content": "VALIDATION SUCCESS: Tested the fix with a dry-run chat import. The CLI successfully discovered and processed 396 chat sessions without the \"lastDate.toISOString is not a function\" error. The fix successfully handles null/undefined date values by providing appropriate fallbacks to current time or new Date().toISOString()."
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},
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{
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"id": "9bbf696c-8ca7-4dc1-b1da-33e49e0e32c7",
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"timestamp": "2025-07-27T14:07:21.122Z",
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"category": "progress",
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"content": "Completed: Successfully fixed the \"lastDate.toISOString is not a function\" error in chat data import. The issue was caused by insufficient type checking in the data mapper where null/undefined values were being passed to toISOString(). Implemented comprehensive null checking and fallback logic for all date handling in the data mapper. Validated the fix with a successful dry-run import of 396 chat sessions."
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}
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],
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"files": [],
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"relatedDevlogs": [],
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"context": {
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"businessContext": "",
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"technicalContext": "Error occurs during chat session import process, likely in the date handling logic where a non-Date value is being passed to toISOString() method",
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"dependencies": [],
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"decisions": [],
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"acceptanceCriteria": [
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"Chat import completes successfully without type errors",
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"lastDate is properly handled as a Date object or null/undefined",
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"All 394 chat sessions are imported correctly",
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"Error handling is improved to prevent similar type mismatches"
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],
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"risks": []
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},
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"aiContext": {
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"currentSummary": "",
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"keyInsights": [],
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"openQuestions": [],
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"relatedPatterns": [],
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"suggestedNextSteps": [],
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"lastAIUpdate": "2025-07-27T14:03:41.110Z",
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"contextVersion": 1
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},
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"closedAt": "2025-07-27T14:07:21.124Z"
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}

‎package.json‎

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"description": "Monorepo for development logging tools and MCP server",
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"scripts": {
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"build": "pnpm -r build",
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"build:test": "pnpm --filter @codervisor/devlog-ai build && pnpm --filter @codervisor/devlog-core build && pnpm --filter @codervisor/devlog-web build:test",
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"start": "pnpm --filter @codervisor/devlog-mcp start",
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"dev": "pnpm --filter @codervisor/devlog-mcp dev",
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"test": "vitest run",
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"test:watch": "vitest",
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"test:ui": "vitest --ui",
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"test:coverage:packages": "pnpm -r test -- --coverage",
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"test:integration": "pnpm --filter @codervisor/devlog-mcp test:integration",
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"clean": "pnpm -r clean && rm -f *.tsbuildinfo",
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"install-all": "pnpm install",
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"build:mcp": "pnpm --filter @codervisor/devlog-mcp build",
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"build:core": "pnpm --filter @codervisor/devlog-core build",
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"build:web": "pnpm --filter @codervisor/devlog-web build",
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"build:vercel": "pnpm --filter @codervisor/devlog-ai build && pnpm --filter @codervisor/devlog-core build && pnpm --filter @codervisor/devlog-web build",
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"dev:mcp": "concurrently --names \"AI,CORE,MCP\" --prefix-colors \"red,green,yellow\" \"pnpm --filter @codervisor/devlog-ai dev\" \"pnpm --filter @codervisor/devlog-core dev\" \"pnpm --filter @codervisor/devlog-mcp dev\"",
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"dev:web": "concurrently --names \"AI,CORE,WEB\" --prefix-colors \"red,green,blue\" \"pnpm --filter @codervisor/devlog-ai dev\" \"pnpm --filter @codervisor/devlog-core dev\" \"pnpm --filter @codervisor/devlog-web dev\"",
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"dev:web:check": "scripts/dev-with-check.sh pnpm dev:web",

‎packages/cli/src/utils/config.ts‎

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// Try to load from default locations
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const defaultPaths = [
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configPath,
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resolve(process.cwd(), '.devlog.json'),
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resolve(process.cwd(), 'devlog.config.json'),
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resolve(homedir(), '.devlog', 'config.json'),
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resolve(homedir(), '.config', 'devlog', 'config.json'),
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].filter(Boolean) as string[];

‎packages/cli/src/utils/data-mapper.ts‎

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timestamp:
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typeof aiSession.timestamp === 'string'
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? aiSession.timestamp
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: aiSession.timestamp.toISOString(),
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: aiSession.timestamp?.toISOString() || currentTime,
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workspace: aiSession.workspace || 'unknown',
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title: aiSession.metadata?.customTitle || `Chat ${sessionId.slice(0, 8)}`,
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status: 'imported',
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importedAt: currentTime,
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updatedAt: (() => {
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const lastDate = aiSession.metadata?.lastMessageDate || aiSession.timestamp;
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if (!lastDate) {
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return currentTime; // Fallback to current time if no date available
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}
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return typeof lastDate === 'string' ? lastDate : lastDate.toISOString();
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})(),
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linkedDevlogs: [],
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timestamp:
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typeof aiMessage.timestamp === 'string'
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? aiMessage.timestamp
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: aiMessage.timestamp.toISOString(),
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: aiMessage.timestamp?.toISOString() || new Date().toISOString(),
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sequence: i,
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metadata: {
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...aiMessage.metadata,

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