feat: add storybook addon

Fixes #4.

examples/vite/.storybook/main.ts

@@ -1,6 +1,4 @@
 import Inspect from 'vite-plugin-inspect'
-import Unplugin from '../../../src/vite'
-import { mergeConfig } from 'vite'
 
 export default {
   stories: [
@@ -11,6 +9,7 @@ export default {
     '@storybook/addon-links',
     '@storybook/addon-essentials',
     '@storybook/addon-interactions',
+    '../../../src/storybook.ts',
   ],
   framework: '@storybook/vue3',
   core: {
@@ -21,11 +20,8 @@ export default {
   },
   async viteFinal(config, { configType }) {
     // Inspect result can be found at subroute '/__inspect', e.g. http://127.0.0.1:6006/__inspect/
-    config.plugins.unshift(Inspect(), Unplugin())
+    config.plugins.unshift(Inspect())
 
-    return mergeConfig(config, {
-      // Other customizations: https://github.com/storybookjs/builder-vite#customize-vite-config
-      // ...
-    })
+    return config
   },
 }

package.json

@@ -62,7 +62,8 @@
     }
   },
   "files": [
-    "dist"
+    "dist",
+    "preset.js"
   ],
   "scripts": {
     "build": "tsup",

preset.js

@@ -0,0 +1 @@
+module.exports = require('./dist/storybook')

src/storybook.ts

@@ -0,0 +1,8 @@
+import type { StorybookViteConfig } from '@storybook/builder-vite'
+import VitePlugin from './vite'
+
+export const viteFinal: StorybookViteConfig['viteFinal'] = (config) => {
+  config.plugins = config.plugins || []
+  config.plugins.unshift(VitePlugin({}))
+  return config
+}