My typescript code is not showing on Javascript file. It runs without any error on my console it just doesn’t show the code on JS file

My TypeScript Code is Not Showing on JavaScript File: Solutions and Fixes

If you are facing an issue where your TypeScript code is not showing up in your JavaScript file, even though it runs without any errors in the console, you are not alone. This problem can be frustrating, but fortunately, there are a few solutions you can try to resolve it. In this article, we will explore some common reasons for this issue and provide step-by-step solutions to get your TypeScript code to show up in your JavaScript file.

1. Check Your TypeScript Compiler Configuration

The first thing you should check is your TypeScript compiler configuration. TypeScript files need to be compiled into JavaScript files before they can be executed in a browser or a Node.js environment. Make sure that your TypeScript compiler is set up correctly and is generating the JavaScript file you expect.

To check your TypeScript compiler configuration, open your tsconfig.json file and verify the following settings:

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "outDir": "dist",
    "rootDir": "src"
  },
  "include": ["src/**/*.ts"]
}

Ensure that the outDir property points to the correct directory where you want your JavaScript files to be generated. Also, make sure that the rootDir property is set to the directory where your TypeScript files are located.

2. Verify Your Import and Export Statements

Another common reason for TypeScript code not showing up in the JavaScript file is incorrect import and export statements. If you are using modules in your TypeScript code, make sure that you are exporting the necessary functions, classes, or variables and importing them correctly in your JavaScript file.

Here’s an example of how to export a function in TypeScript:

// myFunction.ts
export function myFunction() {
  // Code goes here
}

And here’s how to import and use the exported function in your JavaScript file:

// index.js
const { myFunction } = require('./myFunction');
myFunction();

Ensure that you have the correct import and export statements in your code to properly expose and consume your TypeScript functions, classes, or variables.

3. Use TypeScript Declaration Files

If you are using external JavaScript libraries or frameworks in your TypeScript code, you may need to include TypeScript declaration files to provide type information for those libraries. Declaration files have the extension .d.ts and contain type definitions for JavaScript code.

You can search for declaration files for popular libraries on the DefinitelyTyped repository (https://definitelytyped.org/). Once you find the appropriate declaration file, you can include it in your TypeScript project by installing the corresponding package using a package manager like npm or yarn.

For example, if you are using the lodash library, you can install the declaration file by running the following command:

npm install @types/lodash

After installing the declaration file, TypeScript will be able to understand the types used in the library, and your code should show up correctly in the JavaScript file.

4. Check for Compilation Errors

It’s possible that there are compilation errors in your TypeScript code that prevent it from being transpiled into JavaScript. Even if the code runs without errors in the console, the compilation process may still fail silently, resulting in an empty JavaScript file.

To check for compilation errors, run the TypeScript compiler in your terminal or command prompt and look for any error messages or warnings. Fix any issues that are reported and try compiling your TypeScript code again.

Conclusion

If your TypeScript code is not showing up in your JavaScript file, there are several potential solutions you can try. Check your TypeScript compiler configuration, verify your import and export statements, use TypeScript declaration files for external libraries, and ensure that there are no compilation errors in your code.

By following these steps, you should be able to resolve the issue and see your TypeScript code successfully transpiled into JavaScript.

Happy coding!