tsconfig & Modules — Series 3

Preview — 3 of 10 questions

Which options are in effect for the child project?

javascript

// tsconfig.base.json
{ "compilerOptions": { "strict": true, "target": "ES2020", "declaration": true } }

// tsconfig.json
{
  "extends": "./tsconfig.base.json",
  "compilerOptions": { "target": "ES2022" }
}

AOnly target: "ES2022" — extends replaces the whole compilerOptions block

Bstrict: true, target: "ES2022", declaration: true — options are merged key by key, and the child's value wins on conflicts

Cstrict: true, target: "ES2020", declaration: true — the base always takes precedence

DA compile-time error — target may not be redefined in an extending config

javascript

{
  "files": ["src/main.ts"],
  "exclude": ["src/**/*"]
}

ANo files are compiled — exclude removes src/main.ts

BEvery file under src/ is compiled — files is only a hint

CA config error — files and exclude are mutually exclusive

Dsrc/main.ts is compiled — exclude only filters include, never the explicit files list

javascript

tsc --noEmit

AType-checks the project and writes no output files

BSkips type checking and emits JavaScript only

CEmits declaration files but no JavaScript

DEmits nothing and skips checking, so it always exits 0

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