'\r\n const target = `\u003Cdiv id=\"app\">\u003C/div>`\r\n this.shadow = this.attachShadow({ mode: 'open' })\r\n this.shadow.innerHTML = designSystemCSS + target\r\n createApp(App) // App defined elsewhere ofc\r\n .mount(this.shadow.querySelector('#app'))\r\n }\r\n}\r\n```\n\n### Describe the solution you'd like\n\nProbably just being able to set `compilerOptions.isCustomElement` somewhere would be good enough?\n\n### Describe alternatives you've considered\n\n_No response_\n\n### Additional context\n\n_No response_\n\n### Validations\n\n- [X] Follow our [Code of Conduct](https://vuejs.org/about/coc.html)\n- [X] Read the [docs](https://vitepress.vuejs.org).\n- [X] Read the [Contributing Guidelines](https://github.com/vuejs/vitepress/blob/main/.github/contributing.md).\n- [X] Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.",[],735,"Custom element support","2023-01-21T14:34:18Z","https://github.com/vuejs/vitepress/issues/735",0.76805055,["Reactive",3017],{},["Set"],["ShallowReactive",3020],{"$fTRc1wZytZ_XrK4EfJfei_Sz-An4H4Yy6syhVxH_PVJc":-1,"$ftbK9sSuRadY_DxbWTXOIYMIs32TTlZwjBHrRMWchcNM":-1},"/vuejs/vitepress/4114"]