Keywords: CommonJS, module syntax, TypeScript, JavaScript

In TypeScript, the CommonJS module syntax is commonly used to structure and organize code into separate modules. This allows for better maintainability and code reusability. In this blog post, we will take a closer look at how to utilize CommonJS module syntax in TypeScript.

Importing and Exporting Modules

To import modules using CommonJS syntax in TypeScript, you can use the require statement. For example, if you have a module named myModule in a file called module.ts, you can import it as follows:

const myModule = require('./module');

To export modules, you can use the module.exports object. For instance, in module.ts, you can export a function named myFunction as follows:

module.exports.myFunction = () => {
  // Your code here
};

CommonJS and TypeScript Compatibility

By default, TypeScript uses ES modules (ESM) syntax. However, TypeScript provides support for CommonJS modules through the --esModuleInterop compiler option. This option enables interoperability between CommonJS and ES modules.

To enable CommonJS module syntax support in your TypeScript project, follow these steps:

1. Open your tsconfig.json file.
2. Update the file to include the following compiler options:

{
  "compilerOptions": {
    "module": "CommonJS",
    "esModuleInterop": true
  }
}

With the esModuleInterop option set to true, you can now import CommonJS modules into your TypeScript code using the default import syntax:

import myModule from './module';

Conclusion

Using CommonJS module syntax in TypeScript allows you to structure your code into separate reusable modules. By enabling the esModuleInterop compiler option, you can seamlessly import CommonJS modules into your TypeScript project.

By combining the power of TypeScript’s strong typing with the organizational benefits of CommonJS module syntax, you can build robust and scalable applications.

#CommonJS #TypeScript