fix: absoluate path resolve

Author: antfu

src/context.ts

@@ -99,6 +99,8 @@ export class Context {
   }
 
   relative(path: string) {
+    if (path.startsWith('/') && !path.startsWith(this.root))
+      return path.slice(1).replace(/\\/g, '/')
     return relative(this.root, path).replace(/\\/g, '/')
   }
 

test/fixture/src/main.ts

@@ -1,5 +1,5 @@
 import { createApp } from 'vue'
-import App from './App.vue'
+import App from '/src/App.vue'
 import './index.css'
 
 createApp(App).mount('#app')