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commands/add-typescript-best-practices.md

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+---
+description: Setup TypeScript best practices and code style rules in CLAUDE.md
+argument-hint: None required - creates standardized TypeScript guidelines
+---
+
+# Setup TypeScript Best Practices
+
+Create or update CLAUDE.md in with following content, <critical>write it strictly as it is<critical>, do not summaraise or introduce and new additional information:
+
+```markdown
+## Code Style Rules
+
+### General Principles
+
+- **TypeScript**: All code must be strictly typed, leverage TypeScript's type safety features
+
+### Code style rules
+
+- Interfaces over types - use interfaces for object types
+- Use enum for constant values, prefer them over string literals
+- Export all types by default
+- Use type guards instead of type assertions
+
+### Best Practices
+
+#### Library-First Approach
+
+- Common areas where libraries should be preferred:
+  - Date/time manipulation → date-fns, dayjs
+  - Form validation → joi, yup, zod
+  - HTTP requests → axios, got
+  - State management → Redux, MobX, Zustand
+  - Utility functions → lodash, ramda
+
+#### Code Quality
+
+- Use destructuring of objects where possible:
+  - Instead of `const name = user.name` use `const { name } = user`
+  - Instead of `const result = await getUser(userId)` use `const { data: user } = await getUser(userId)`
+  - Instead of `const parseData = (data) => data.name` use `const parseData = ({ name }) => name`
+- Use `ms` package for time related configuration and environment variables, instead of multiplying numbers by 1000
+```