Tips on leveraging separate files for classes in TypeScript

I'm currently working on developing a TypeScript application where each class is saved in its own .ts file. I prefer to use VS Code for this project. So far, my compile task seems to be functioning correctly (transpiling .ts files into .js files). However, when trying to load my main.js file into my HTML page, I encounter the following JavaScript error:

Can't find variable: require

The TypeScript code snippet is as follows:

// __________ car.ts __________ 
class Car {
    color: string;

    constructor(color: string) {
        this.color = color;
        console.log("created a new " + color + " car");
    }
}
export = Car;

// __________ main.ts __________ 
import Car = require('car');

class Startup {
    public static main(): number {
        console.log('Hello World');
        var c = new Car("red");
        return 0;
    }
}

Here's a glimpse at my tsconfig file:

{
    "compilerOptions": {
        "module": "commonjs",
        "sourceMap":  true
    },
     "files": [
        "car.ts",
        "main.ts"
    ]
}

I seem to be missing a crucial step here. Why does JavaScript require something like 'require'? Is there an alternative approach to working with classes stored in separate files?

Answer №1

Utilize method is an essential component of NodeJS. To enable the use of require in browsers, it is necessary to download and install requirejs.

If you wish to incorporate internal modules, include outFile in your configuration file tsconfig.json:

{
    "compilerOptions": {
        "module": "commonjs",
        "sourceMap":  true,
        "outFile": "app.js"
    },
     "files": [
        "car.ts",
        "main.ts"
    ]
}

Finally, insert

<script src="app.js"></script>
within your index.html document.

Answer №2

UPDATE: TypeScript-Handbook: Splitting Across Files:

A useful method to reference files to each other while coding is by using

///<reference path="someOtherScript.ts" />
at the beginning of each file

You can also compile all input files into a single JavaScript output file using the --out flag: tsc --out sample.js Test.ts

Add "outFile": "app.js" in the "compilerOptions": {


You have the option to compile all .ts files into one .js file, which can result in cleaner TypeScript code. This is my preferred method for development.

In Visual Studio, it's done with

<TypeScriptOutFile>myfile.js</TypeScriptOutFile>
. A similar approach may be available in Visual Code as well?

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