How to compile multiple Typescript files into a single file ?

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In this article, we will learn how to compile multiple Typescript files into a single file. There are two approaches that can be followed here:

Approach 1: Compiling multiple Typescript files into a single JavaScript file. We simply use the following syntax:

Syntax:

tsc –out outputFile.js typeScriptFile1.ts typeScriptFile2.ts … typeScriptFilen.ts

Explanation:

tsc: It stands for TypeScript compiler which is used to invoke the compiler in order to compile the TypeScript files.
–out: It is a CLI (Command Line Interface) command which concatenates the TypeScript files and emits the output to a single JS file.
outputFile.js: The JavaScript file which holds the result of the compilation of the TypeScript files.
typeScriptFile1, typeScriptFile2 … typeScriptFilen: The TypeScript files to be compiled.

Example: Here, three TypeScript files with the names script.ts, index.ts and app.ts are compiled to a single JavaScript file output.js. Subsequently, the JavaScript file is executed by using the following CLI command:

node output.js

script.ts

const myArr = [1, 2, 3, 4, 5]; 
  
console.log("CONTENTS OF FILE 1"); 
  
for (let i = 0; i < myArr.length; i++) { 
  console.log(myArr[i]); 
}

index.ts

const GFG = ["Geeks", "For", "Geeks"]; 
  
console.log("\nCONTENTS OF FILE 2"); 
  
for (let i = 0; i < GFG.length; i++) { 
  console.log(GFG[i]); 
}

app.ts

const zambiatek = [true, false, 2.5, 5]; 
  
console.log("\nCONTENTS OF FILE 3"); 
  
for (let i = 0; i < zambiatek.length; i++) { 
  console.log(zambiatek[i]); 
}

Generated output JavaScript file “output.js”

output.js

var myArr = [1, 2, 3, 4, 5]; 
  
console.log("CONTENTS OF FILE 1"); 
  
for (var i = 0; i < myArr.length; i++) { 
    console.log(myArr[i]); 
} 
  
var GFG = ["Geeks", "For", "Geeks"]; 
  
console.log("\nCONTENTS OF FILE 2"); 
  
for (var i = 0; i < GFG.length; i++) { 
    console.log(GFG[i]); 
} 
  
var zambiatek = [true, false, 2.5, 5]; 
  
console.log("\nCONTENTS OF FILE 3"); 
  
for (var i = 0; i < zambiatek.length; i++) { 
    console.log(zambiatek[i]); 
}

Output:

Approach 2: Compiling multiple Typescript files into a single TypeScript file. We use the following syntax:

Syntax:

tsc –out outputFile.ts typeScriptFile1.ts typeScriptFile2.ts … typeScriptFilen.ts

Explanation:

tsc: It stands for TypeScript compiler which is used to invoke the compiler in order to compile the TypeScript files.
–out: It is a CLI (Command Line Interface) command which concatenates the TypeScript files and emits the output to a single TypeScript file
outputFile.ts: The TypeScript file which holds the result of the compilation of the TypeScript files
typeScriptFile1, typeScriptFile2 … typeScriptFilen: The TypeScript files to be compiled.

Example: Here, three TypeScript files with the names file1.ts, file2.ts and file3.ts are compiled to a single TypeScript file output.ts. After that, the resultant TypeScript file is compiled to a JavaScript file output.js and then the JavaScript file is executed by using the following CLI commands:

tsc output.ts
node output.js

file1.ts

let i = 1; 
console.log("CONTENTS OF FILE 1"); 
while (i <= 5) { 
  console.log(i); 
  i++; 
}

file2.ts

console.log("\nCONTENTS OF FILE 2"); 
console.log("GeeksForGeeks is a computer science portal for zambiatek.");

file3.ts

const zambiatek = [2, 4, 6, 8]; 
console.log("\nCONTENTS OF FILE 3"); 
for (let i = 0; i < zambiatek.length; i++) { 
  console.log(zambiatek[i]); 
}

Generated output TypeScript file “output.ts”

output.ts

var i = 1; 
console.log("CONTENTS OF FILE 1"); 
while (i <= 5) { 
    console.log(i); 
    i++; 
} 
console.log("\nCONTENTS OF FILE 2"); 
console.log("GeeksForGeeks is a computer science portal for zambiatek."); 
var zambiatek = [2, 4, 6, 8]; 
console.log("\nCONTENTS OF FILE 3"); 
for (var i_1 = 0; i_1 < zambiatek.length; i_1++) { 
    console.log(zambiatek[i_1]); 
}

Generated output JavaScript file “output.js”

output.js

var i = 1; 
console.log("CONTENTS OF FILE 1"); 
while (i <= 5) { 
    console.log(i); 
    i++; 
} 
console.log("\nCONTENTS OF FILE 2"); 
console.log("GeeksForGeeks is a computer science portal for zambiatek."); 
var zambiatek = [2, 4, 6, 8]; 
console.log("\nCONTENTS OF FILE 3"); 
for (var i_1 = 0; i_1 < zambiatek.length; i_1++) { 
    console.log(zambiatek[i_1]); 
}