"Cannot use import statement outside a module" when importing a self made class

Question

I looked at several other questions and tried a lot around but i cant find the problem.

Those are my imports from the HTML file:

<script src="./script/Graph.js" type="module"></script>
<script src="./script/Main.js"></script>

Graph.js:

export default class Graph {
  constructor() {
      this.vertices = [];
      this.edges = [];
      this.numberOfEdges = [];       
  }
  ...followed by several functions
}

Main.js:

import Graph from "./Graph.js";

Iam thankful for any tip :)

Answer 1

To use import - export in your files you need to specify the type of script file as module

so the corrected code would be

<script src="./script/Graph.js" type="module"></script>
<script src="./script/Main.js" type="module"></script>

Read more on Modules

Extra:

You might come across CORS (cross origin resource sharing policy) while using import-export, to overcome this you could use one of the following

• Live server extension for visual studio code
• Node express.js serve static files
• Github pages publish your project to a github repository and make use of github pages to serve your files