<ol>
<li>Initialize your application:
<pre><code class="lang-bash"> npm init
</code></pre>
</li>
<li>To use ES modules, add <code>type: "module"</code> to package.json file.
</li>
<li>Install Jest
<pre><code class="lang-bash"> npm i jest
</code></pre>
</li>
<li>Initialize Jest
<pre><code class="lang-bash"> npm init jest@latest
</code></pre>
</li>
<li>In jest.config.mjs file: de-comment <code>transform</code> key and assign it a value like <code>transform: { "^.+\\.js$": "babel-jest" }</code>. Just be aware that the rejex will depend on the file extensions on your project.
</li>
<li>Install babel
<pre><code class="lang-bash"> npm i @babel/core @babel/node @babel/preset-env
</code></pre>
</li>
<li>Configure babel by creating .babelrc file in the root folder.
</li>
<li>Inside .babelrc file add:
<pre><code class="lang-javascript"> {
 "presets": [["@babel/preset-env", { "targets": { "node": "current" } }]]
 }
</code></pre>
</li>
</ol>
To start running your tests:
<ol>
<li>add the <code>test</code> script to <code>scripts</code> inside package.json file
<pre><code class="lang-javascript"> "scripts": {
 "test": "jest"
 },
</code></pre>
</li>
<li>run the script
<pre><code class="lang-bash"> npm run test
</code></pre>
</li>
</ol>

1. Initialize your application:
    
    ```bash
     npm init
    ```
    
2. To use ES modules, add `type: "module"` to *package.json* file.
    
3. Install Jest
    
    ```bash
    npm i jest
    ```
    
4. Initialize Jest
    
    ```bash
     npm init jest@latest
    ```
    
5. In *jest.config.mjs* file: de-comment `transform` key and assign it a value like `transform: { "^.+\\.js$": "babel-jest" }`. Just be aware that the **rejex** will depend on the file extensions on your project.
    
6. Install babel
    
    ```bash
    npm i @babel/core @babel/node @babel/preset-env
    ```
    
7. Configure babel by creating *.babelrc* file in the root folder.
    
8. Inside *.babelrc* file add:
    
    ```javascript
    {
        "presets": [["@babel/preset-env", { "targets": { "node": "current" } }]]
    }
    ```
    

To start running your tests:

1. add the `test` script to `scripts` inside *package.json file*
    
    ```javascript
     "scripts": {
        "test": "jest"
      },
    ```
    
2. run the script
    
    ```bash
    npm run test
    ```

Configure Jest to use it with NodeJS ECMAScript Modules