How to import JavaScript file into a TypeScript file?

To import a JavaScript file into a TypeScript file, you can use the following steps:

1. Enable JavaScript imports in your `tsconfig.json` file. Add the following line to the `compilerOptions` section:


    "allowJs": true,

2. Import the JavaScript file using the following syntax:


    import * as <module-name> from './<path-to-file>';

For example, to import the JavaScript file employee.js, you would use the following code:

import * as Employee from "./employee.js";

3. Use the imported module in your TypeScript code. For example, you could create a new instance of the `Employee` class:

const employee: Employee = new Employee();

If you are importing a specific export from a JavaScript file, you can use the following syntax:


    import { <export-name> } from './<path-to-file>';

For example, to import the name property from the Employee class, you would use the following code:

import { name } from "./employee.js";

Once you have imported a JavaScript file into a TypeScript file, you can use it in your code just like any other TypeScript module.

Example of a complete TypeScript file that imports a JavaScript file

// Import the `Employee` class from the `employee.js` file.
import { Employee } from "./employee.js";

// Create a new instance of the `Employee` class.
const employee: Employee = new Employee();

// Log the employee's name to the console.
console.log(employee.name);

This code will compile and run without any errors.

Note: If you are using TypeScript to compile your code to JavaScript, you will need to make sure that the JavaScript file that you are importing is also compiled to JavaScript. You can do this by using the npm run build command or by using a tool such as Webpack.

How to import JavaScript file into a TypeScript file?