title: How do I specify a valid entry point / file for Vue projects?
body: <p>Came back to an old Vue project. Try to bring it up on my local machine using 'vue serve' and I got the following error.</p>
  
  <p>How do I specify a valid entry point for vue projects?</p>
  
  <p>Command:</p>
  
  <pre><code>vue serve
  </code></pre>
  
  <p>Terminal Error:</p>
  
  <pre><code>"Failed to locate entry file in /Users/$username/Desktop/my-project.
  "Valid entry file should be one of: main.js, index.js, App.vue or app.vue.
  </code></pre>