chore: mark jsdom as external to remove warning

packages/server/package.js

@@ -1,3 +1,6 @@
 export default {
-  build: true
+  build: true,
+  rollup: {
+    externals: ['jsdom']
+  }
 }

scripts/package.js

@@ -189,7 +189,8 @@ export default class Package {
     const config = {
       rootDir: this.options.rootDir,
       alias: {},
-      replace: {}
+      replace: {},
+      ...this.options.rollup
     }
 
     // Replace linkedDependencies with their suffixed version

scripts/rollup.config.js

@@ -17,6 +17,7 @@ export default function rollupConfig ({
   input = 'src/index.js',
   replace = {},
   alias = {},
+  externals = [],
   resolve = {
     only: [
       /lodash/
@@ -43,7 +44,9 @@ export default function rollupConfig ({
       // Dependencies that will be installed alongise with the nuxt package
       ...Object.keys(pkg.dependencies || {}),
       // Builtin node modules
-      ...builtins
+      ...builtins,
+      // Explicit externals
+      ...externals
     ],
     plugins: [
       aliasPlugin(alias),