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How to compile multiple Typescript files into a single file ?

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  • Last Updated : 09 Mar, 2022

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


file3.ts




const geeks = [2, 4, 6, 8];
console.log("\nCONTENTS OF FILE 3");
for (let i = 0; i < geeks.length; i++) {
  console.log(geeks[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 geeks.");
var geeks = [2, 4, 6, 8];
console.log("\nCONTENTS OF FILE 3");
for (var i_1 = 0; i_1 < geeks.length; i_1++) {
    console.log(geeks[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 geeks.");
var geeks = [2, 4, 6, 8];
console.log("\nCONTENTS OF FILE 3");
for (var i_1 = 0; i_1 < geeks.length; i_1++) {
    console.log(geeks[i_1]);
}


Output:


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