Avoiding String Literals in JavaScript/TypeScript

JavaScript doesn’t have a nameof keyword. Use constants or keyof to keep names in sync.

Constants

const Handlers = {
  createOrder: 'createOrder',
  cancelOrder: 'cancelOrder'
} as const;

type HandlerName = keyof typeof Handlers;

keyof for safe property names

type User = { id: string; name: string };
const field: keyof User = 'name';

Interview prompt

• How do you avoid magic strings in a large codebase?