Layers

One of the core features of Nuxt is the layers and extending support. You can extend a default Nuxt application to reuse components, utils, and configuration. The layers structure is almost identical to a standard Nuxt application which makes them easy to author and maintain.

Use Cases

• Share reusable configuration presets across projects using nuxt.config and app.config
• Create a component library using app/components/ directory
• Create utility and composable library using app/composables/ and app/utils/ directories
• Create Nuxt module presets
• Share standard setup across projects
• Create Nuxt themes
• Enhance code organization by implementing a modular architecture and support Domain-Driven Design (DDD) pattern in large scale projects.

Usage

By default, any layers within your project in the ~~/layers directory will be automatically registered as layers in your project.

In addition, named layer aliases to the srcDir of each of these layers will automatically be created. For example, you will be able to access the ~~/layers/test layer via #layers/test.

In addition, you can extend from a layer by adding the extends property to your nuxt.config file.

export default defineNuxtConfig({
  extends: [
    '../base',                     // Extend from a local layer
    '@my-themes/awesome',          // Extend from an installed npm package
    'github:my-themes/awesome#v1', // Extend from a git repository
  ]
})

You can also pass an authentication token if you are extending from a private GitHub repository:

export default defineNuxtConfig({
  extends: [
    // per layer configuration
    ['github:my-themes/private-awesome', { auth: process.env.GITHUB_TOKEN }]
  ]
})

export default defineNuxtConfig({
  extends: [
    [
      'github:my-themes/awesome',
      { 
        meta: {
          name: 'my-awesome-theme',
        },
      },
    ],
  ]
})

Nuxt uses unjs/c12 and unjs/giget for extending remote layers. Check the documentation for more information and all available options.

Layer Priority

When using multiple layers, it's important to understand how they override each other:

1. Layers in extends - earlier entries have higher priority (first overrides second)
2. Auto-scanned local layers from ~~/layers directory in alphabetical order (Z overrides A)
3. Your project has the highest priority in the stack - it will always override other layers

export default defineNuxtConfig({
  extends: [
    '../base',                     // Highest priority (among extends)
    '@my-themes/awesome',          // Medium priority
    'github:my-themes/awesome#v1', // Lower priority
  ]
  // Your project has the highest priority
})

This means if multiple layers define the same component, configuration, or file, the one with higher priority will be used.

Examples