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TypeScript Advanced: Types That Hold Up in Production
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TypeScript Advanced: Types That Hold Up in Production

Check Yourself: Projects That Scale

Five scenario questions on project references, solution-style configs and type-aware linting. If you miss more than one, reread the lessons in this section.

5 min TypeScriptTesting and DebuggingPerformance OptimizationType SystemsPackaging and Dependencies Advanced
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1. What does composite do in a tsconfig?
It merges all the projects in the repository into one program. It makes the project referenceable: declaration output is on, every file has to match include, and a tsbuildinfo file is written. It turns on strict mode for all the files. It makes the compiler run faster by skipping type checks.
2. What is the job of "files": [] in a solution-style root tsconfig?
It declares that the project has no output. It tells the compiler to ignore every file in the repository. It stops the root config from compiling the whole tree as one program and leaves it as a list of project references. It makes tsc -b optional.
3. You run tsc -p on the app before the shared library has been built. What happens?
The app cannot find the library, because only its declaration output is read and that output does not exist yet. The build succeeds and the error appears at run time. The compiler reads the library source instead. The compiler builds the library automatically.
4. Which rule is NOT in the recommended type-checked preset and has to be switched on by hand to find a missing case in a switch over a union?
no-misused-promises switch-exhaustiveness-check no-unsafe-assignment no-floating-promises
5. On TypeScript 7.0, typescript-eslint fails to start with the plain typescript package. Which setup do the TypeScript team recommend?
Keep TypeScript 5 for the whole project and skip version 7. Turn off type information in the rules and keep the plain package. Install the version 6 compatibility package under the name typescript, and the real compiler beside it, for example as @typescript/native, so tsc still builds. Install typescript-eslint with the legacy peer dependencies flag and ignore the warning.

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Five scenario questions on project references, solution-style configs and type-aware linting. If you miss more than one, reread the lessons in this section.

Duration
5 min
Last update
10/05/2026
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