TypeScript Compiler Installation and Setup - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to install TypeScript globally using npm.

Typescript

npm install -g [1]

Drag options to blanks, or click blank then click option'

Anpm

Bnode

Ctypescript

Dtsc

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'node' instead of 'typescript'.

Trying to install 'tsc' directly.

Installing 'npm' which is the package manager.

The correct package to install TypeScript globally is typescript. This allows you to use the tsc command anywhere.

2fill in blank

medium

Complete the command to check the installed TypeScript compiler version.

Typescript

tsc [1]

Drag options to blanks, or click blank then click option'

A-v

B--version

C--help

D--check

Attempts:

3 left

💡 Hint

Common Mistakes

Using '--help' which shows help info, not version.

Using '--check' which is invalid.

The tsc -v or tsc --version command shows the installed TypeScript compiler version.

3fill in blank

hard

Fix the error in the command to compile a TypeScript file named app.ts.

Typescript

tsc [1]

Drag options to blanks, or click blank then click option'

Aapp.js

Bapp.json

Capp

Dapp.ts

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to compile a JavaScript file.

Omitting the file extension.

Using a JSON file.

The TypeScript compiler expects the source file with the .ts extension. So app.ts is correct.

4fill in blank

hard

Fill both blanks to create a tsconfig.json file with strict type checking enabled.

Typescript

{
  "compilerOptions": {
    "strict": [1],
    "target": "[2]"
  }
}

Drag options to blanks, or click blank then click option'

Atrue

Bfalse

CES6

DES5

Attempts:

3 left

💡 Hint

Common Mistakes

Setting strict to false disables important checks.

Using ES5 target limits modern features.

Setting "strict": true enables strict type checking. The "target": "ES6" sets the JavaScript version output.

5fill in blank

hard

Fill all three blanks to compile TypeScript files in the src folder and output JavaScript files to the dist folder.

Typescript

tsc --project [1] --outDir [2] --[3]

Drag options to blanks, or click blank then click option'

Atsconfig.json

Bdist

Cwatch

Dsrc

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'src' as output directory.

Omitting the watch flag when wanting live compilation.

Not specifying the project config.

The --project tsconfig.json tells tsc to use the config file. --outDir dist sets the output folder. --watch makes the compiler watch for changes.

Practice

1. What command do you use to install the TypeScript compiler globally on your system?

easy

A. npm install typescript

B. tsc install

C. npm install -g typescript

D. install typescript -g

Solution

1. Step 1: Understand global installation

   To use TypeScript compiler anywhere, it must be installed globally using npm with the -g flag.

2. Step 2: Identify correct npm command

   The correct command is npm install -g typescript which installs TypeScript globally.

3. Final Answer:

   npm install -g typescript -> Option C

4. Quick Check:

   Global install uses npm install -g [OK]

Hint: Use npm install -g to install global packages [OK]

Common Mistakes:

• Forgetting the -g flag for global install
• Using 'tsc install' which is invalid
• Installing locally without -g

2. Which of the following commands correctly compiles a TypeScript file named app.ts into JavaScript?

easy

A. tsc app.js

B. tsc app.ts

C. npm run app.ts

D. compile app.ts

Solution

1. Step 1: Identify the TypeScript compiler command

   The TypeScript compiler command is tsc followed by the TypeScript file name.

2. Step 2: Match the correct file extension

   We must compile the .ts file, so the command is tsc app.ts.

3. Final Answer:

   tsc app.ts -> Option B

4. Quick Check:

   Compile with tsc filename.ts [OK]

Hint: Use tsc followed by .ts filename to compile [OK]

Common Mistakes:

• Trying to compile .js files with tsc
• Using npm run instead of tsc
• Typing wrong command like 'compile'

3. After installing TypeScript globally, what will be the output of the command tsc --version if the installed version is 5.1.3?

medium

A. TypeScript 5.1.3

B. tsc version: 5.1.3

C. 5.1.3

D. Version 5.1.3

Solution

1. Step 1: Understand tsc --version output format

   The tsc --version command outputs 'TypeScript 5.1.3'.

2. Step 2: Match output to options

   Only 'TypeScript 5.1.3' matches the exact output format.

3. Final Answer:

   TypeScript 5.1.3 -> Option A

4. Quick Check:

   tsc --version outputs 'TypeScript X.Y.Z' [OK]

Hint: tsc --version shows 'TypeScript X.Y.Z' [OK]

Common Mistakes:

• Expecting only the version number without 'TypeScript ' prefix
• Confusing output with npm version output
• Adding extra text like 'Version'

4. You run tsc app.ts but get an error: tsc: command not found. What is the most likely cause?

medium

A. Node.js is not installed

B. app.ts file has syntax errors

C. You need to run npm start instead

D. TypeScript is not installed globally or PATH is not set

Solution

1. Step 1: Analyze the error message

   The error 'tsc: command not found' means the system cannot find the TypeScript compiler command.

2. Step 2: Identify cause of missing command

   This usually happens if TypeScript is not installed globally or the system PATH does not include the location of tsc.

3. Final Answer:

   TypeScript is not installed globally or PATH is not set -> Option D

4. Quick Check:

   Command not found means missing install or PATH [OK]

Hint: Check if tsc is installed globally and in PATH [OK]

Common Mistakes:

• Assuming syntax errors cause command not found
• Trying npm start which is unrelated
• Thinking Node.js absence causes this error

5. You want to compile multiple TypeScript files in a project folder without typing each filename. Which setup helps you compile all files at once?

hard

A. Create a tsconfig.json file and run tsc without arguments

B. Run tsc *.ts in the terminal

C. Install TypeScript locally and run npm compile

D. Use tsc --all command

Solution

1. Step 1: Understand how to compile multiple files

   TypeScript uses a tsconfig.json file to configure project compilation settings for multiple files.

2. Step 2: Use tsc with tsconfig.json

   Running tsc without arguments reads tsconfig.json and compiles all files specified there.

3. Final Answer:

   Create a tsconfig.json file and run tsc without arguments -> Option A

4. Quick Check:

   tsconfig.json enables project-wide compilation [OK]

Hint: Use tsconfig.json and run tsc alone to compile all [OK]

Common Mistakes:

• Trying to use wildcard *.ts which may not work in all shells
• Assuming npm compile is a default command
• Using non-existent tsc --all option