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.serena/memories/code_style_conventions.md

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+# Code Style and Conventions
+
+## TypeScript Configuration
+- **Strict mode enabled**: All strict checks are on
+- **Target**: ES2022
+- **Module**: ESNext with bundler resolution
+- **Path aliases**: `@stock-bot/*` maps to `libs/*/src`
+- **Decorators**: Enabled for dependency injection
+
+## Code Style Rules (ESLint)
+- **No unused variables**: Error (except prefixed with `_`)
+- **No explicit any**: Warning
+- **No non-null assertion**: Warning
+- **No console**: Warning (except in tests)
+- **Prefer const**: Enforced
+- **Strict equality**: Always use `===`
+- **Curly braces**: Required for all blocks
+
+## Formatting (Prettier)
+- **Semicolons**: Always
+- **Single quotes**: Yes
+- **Trailing comma**: ES5
+- **Print width**: 100 characters
+- **Tab width**: 2 spaces
+- **Arrow parens**: Avoid when possible
+- **End of line**: LF
+
+## Import Order
+1. Node built-ins
+2. Third-party modules
+3. `@stock-bot/*` imports
+4. Relative imports (parent directories first)
+5. Current directory imports
+
+## Naming Conventions
+- **Files**: kebab-case (e.g., `database-setup.ts`)
+- **Classes**: PascalCase
+- **Functions/Variables**: camelCase
+- **Constants**: UPPER_SNAKE_CASE
+- **Interfaces/Types**: PascalCase with 'I' or 'T' prefix optional
+
+## Library Standards
+- **Named exports only**: No default exports
+- **Factory patterns**: For complex initialization
+- **Singleton pattern**: For global services (config, logger)
+- **Direct class exports**: For DI-managed services
+
+## Testing
+- **File naming**: `*.test.ts` or `*.spec.ts`
+- **Test structure**: Bun's built-in test runner
+- **Integration tests**: Use TestContainers for databases
+- **Mocking**: Mock external dependencies
+
+## Documentation
+- **JSDoc**: For all public APIs
+- **README.md**: Required for each library
+- **Usage examples**: Include in documentation
+- **Error messages**: Descriptive with context