Encountered an issue with resolving the module specifier while utilizing a Web Component

I recently added the @tokens-studio/configurator package from NPM to my project. However, upon importing it as instructed, I encountered the following error:

Failed to resolve module specifier "@tokens-studio/configurator". 
Relative references must start with either "/", "./", or "../".

Below is a snippet of my HTML file where I attempted to import the package:

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script type="module">
      import '@tokens-studio/configurator';
    </script>
</head>

<body>
    <main>
        <configurator-element>
            <div style="height: 100%" slot="monaco-config"></div>
            <div style="height: 100%" slot="monaco-output"></div>
        </configurator-element>
    </main>
</body>

Can anyone point out what mistake I might be making here?

javascriptnpmwebpackweb-componentes6-modules

Answer №1

Seems like you're attempting to utilize ESM directly in the browser without going through a bundling process. There are three types of imports:

  1. Absolute imports: 
    import 'https://example.com/shapes/circle.js'
  2. Relative imports: import './circle.js'
  3. Bare imports: 
    import '@tokens-studio/configurator'
    ;

If you're familiar with Node.js, all three types are supported. For bare imports like the one you're using, Node.js searches the node_modules directory from the current directory up to the root directory.

But in the world of browsers, the concept of bare imports is unclear. Browsers don't know where to find a specific module because they lack access to the native operating system.

This is where import-maps come into play. All modern browsers support this feature, and you can define it like so (note that the actual path may vary based on your server configuration and the main/export specified in the package.json file for the @tokens-stuido/configurator package):

<script type="importmap">
  {
    "imports": {
      "@tokens-studio/configurator": "http://localhost:8080/node_modules/@tokens-studio/configurator/index.js",
    }
  }
</script>

You'll also need a server that can serve this required file from the node_modules directory.

The more common approach is to use module bundlers like Webpack, Vite, or Parcel.

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