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TypeScript Configuration and Performance

This quiz explores TypeScript Configuration and Performance, focusing on optimizing tsconfig.json for large projects and performance tuning for TypeScript compilation.

Last Updated : Feb 11, 2025
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Question 1

What is the purpose of the tsconfig.json file in a TypeScript project?

  • A

    It defines runtime behaviour for TypeScript code.

  • B

    It specifies compiler options, file inclusions, and TypeScript project configurations.

  • C

    It replaces all JavaScript configuration files.

  • D

    It is only required for TypeScript projects larger than 10 files.

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Question 2

Which tsconfig.json option improves performance by only compiling changed files in large projects?

  • A

    "incremental": true

  • B

    "strict": true

  • C

    "module": "CommonJS"

  • D

    "target": "ES6"

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Question 3

What does the "exclude" option in tsconfig.json do?

  • A

    Excludes specific TypeScript files from compilation.

  • B

    Prevents JavaScript files from being executed

  • C

    Marks files as optional in the TypeScript project.

  • D

    Reduces the number of dependencies in node_modules

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Question 4

Which tsconfig.json option can be used to speed up TypeScript compilation by limiting the number of CPU cores used?

  • A

    "maxCpuUsage"

  • B

    "compileThreads"

  • C

    "disableThreading"

  • D

    TypeScript does not have a direct CPU-limiting option.

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Question 5

Which tool can be used to analyze and improve TypeScript build performance?

  • A

    tsc --watch

  • B

    tsc --diagnostics

  • C

    tsc --optimize

  • D

    tsc --fast

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Question 6

What does the "skipLibCheck": true option do in tsconfig.json?

  • A

    Skips type checking for third-party libraries, improving compilation speed.

  • B

    Removes all type definitions from node_modules.

  • C

    Disables TypeScript’s type-checking system entirely.

  • D

    Forces TypeScript to check every single .d.ts file strictly.

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Question 7

How does "isolatedModules": true improve performance in TypeScript projects?

  • A

    It ensures each file is compiled independently, allowing faster transpilation.

  • B

    It merges all TypeScript files into a single output file.

  • C

    It prevents TypeScript from using module imports.

  • D

    It optimizes runtime performance instead of compilation speed.

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Question 8

What is the benefit of using esbuild with TypeScript?

  • A

    It reduces runtime memory usage in TypeScript applications.

  • B

    It speeds up TypeScript transpilation significantly compared to tsc.

  • C

    It removes TypeScript's need for tsconfig.json.

  • D

    It enables TypeScript code to run in older browsers.

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Question 9

Which strategy helps improve TypeScript build times in a monorepo setup?

  • A

    Using project references ("composite": true).

  • B

    Running tsc separately for each module.

  • C

    Disabling tsconfig.json.

  • D

    Converting all TypeScript files to JavaScript.

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Question 10

What is the advantage of "noEmit": true in TypeScript projects?

  • A

    Prevents JavaScript output, useful for type-checking only.

  • B

    Optimizes compiled JavaScript for performance.

  • C

    Skips type checking and speeds up compilation.

  • D

    Forces TypeScript to generate separate .map files.

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