TypeScript Next Steps

Where to use TypeScript next

• React: type props with interfaces and let hooks infer the rest — React course.
• Node.js APIs: type request bodies and validate them with Zod; see the Node.js cookbook.
• Next.js: full-stack TypeScript — Next.js cookbook.

Interview practice

• TypeScript interview questions
• Group By, Result type, Pick & Omit
• Output puzzles: enums, type assertions, readonly

Keep your types honest

• Turn on strict and noUncheckedIndexedAccess.
• Avoid any; use unknown and narrow.
• Validate data at the edges of your program (API responses, forms, environment variables).

const learned = ["types", "interfaces", "unions", "narrowing", "generics", "utility types", "discriminated unions"] as const;
type Topic = (typeof learned)[number];
const next: Topic = "generics";
learned.forEach((t, i) => console.log(`${i + 1}. ${t} ✓`));
console.log(`Revisit "${next}" while building a real project!`);

1. types ✓
2. interfaces ✓
3. unions ✓
4. narrowing ✓
5. generics ✓
6. utility types ✓
7. discriminated unions ✓
Revisit "generics" while building a real project!