unplugin

Virtual Modules

Create virtual modules that can be imported by your code. These modules don't exist on the filesystem but are created on the fly by the plugin.

unplugin.createPlugin({
  resolveId(id) {
    if (id === 'virtual-module') return id;
  },
  load(id) {
    if (id === 'virtual-module') return 'export default "This is virtual!"';
  }
});

Transformations

Apply custom transformations to your code. This can be used to modify the source code of files before they are bundled.

unplugin.createPlugin({
  transform(code, id) {
    if (id.endsWith('.custom')) {
      return code.replace(/find/g, 'replace');
    }
  }
});

Custom Build Steps

Execute custom code at different stages of the build process. This can be used to perform tasks before or after the build.

unplugin.createPlugin({
  buildStart() {
    console.log('Build started!');
  },
  buildEnd() {
    console.log('Build finished!');
  }
});