typescript

TypeScript

• Use the guidelines for JavaScript
• Use TypeScript in strict mode
• Use ESLint and Prettier for auto-formatting and auto-fixing
• Use Jest for unit testing
• Prefer Functions over Classes
• Prefer functional style (map/filter/reduce) over iteration (for/while/.each)
• Prefer arrow functions =>, over the function keyword except when using Generics
• Use Generic Constraints when possible
• Use PascalCase for Interfaces and Type Aliases
• Use readonly properties where applicable
• Use Const Assertions where applicable to avoid type widening
• Avoid complex conditionals inside TSX
• Avoid Mixins
• Avoid Decorators
• Avoid Overloading Functions
• Prefer async/await over traditional promise syntax
• Prefer Optional Properties in an interface rather than declaring the property type as T | undefined
• Prefer explicitly defining interfaces over Extending Interfaces
• Avoid the use of the any type
• Avoid the Non-null assertion operator
• Avoid Type Assertions
• Prefer the as-syntax for Type Assertions over the angle-bracket syntax
• Use the Nullish coalescing operator
• Prefer Type Guards over Type Assertions
• Prefer Union Types, Lookup Types, Mapped Types and Const Assertions over Enums