tsconfig & Modules

Preview — 3 of 10 questions

What does enabling "strict": true in tsconfig.json do?

javascript

{
  "compilerOptions": {
    "strict": true
  }
}

AEnables only noImplicitAny — the most common strict option

BEnables all compiler options including noEmit and declaration

CMakes TypeScript error on all any types including library types

DEnables a group of strict type-checking options: noImplicitAny, strictNullChecks, strictFunctionTypes, strictPropertyInitialization, and more

What error does strictNullChecks catch?

javascript

// tsconfig: "strictNullChecks": true

function getUser(id: string): User | null {
  return id === "1" ? { name: "Alice" } : null;
}

const user = getUser("2");
console.log(user.name); // ?

ANo error — TypeScript trusts you won't get null

BError — user could be null, and accessing .name on null crashes at runtime

CError only if user is explicitly typed as null

DWarning only — not an error

What do these fields control?

javascript

{
  "compilerOptions": { "outDir": "./dist" },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/*.test.ts", "dist"]
}

Aexclude is required; include is optional

Binclude and exclude both filter the output files in outDir

Cinclude lists files to compile; exclude removes files from that set

DBoth fields accept only exact file paths, not glob patterns

Answer all 10 questions (7 more), see explanations for every answer, and track your score.