[@vue/compiler-sfc] :deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead of :deep <inner-selector>.

`@vue/compiler-sfc` 提供的`:deep`伪元素选择器用于CSS scoped样式中，表示对组件内部深嵌套元素的选择。然而，从某个版本开始，Vue官方推荐不再直接使用`:deep`作为组合符，而是将其放在圆括号内，即`:deep(<inner-selector>)`的形式。这是因为`:deep`结合其他选择器可能会导致解析混乱，采用这种方式可以提高CSS解析的明确性和一致性。如果您的项目中还存在`:deep <inner-selector>`的使用，建议更新为新的语法形式以避免警告并保持最佳实践。

相关问题

[@vue/compiler-sfc] ::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead.

\[@vue/compiler-sfc\] ::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead. 这个报错是因为在Vue 3中，::v-deep选择器作为组合器已经被弃用了，取而代之的是使用:deep(<inner-selector>)选择器。这个报错可能会在一些手写的组件或者一些第三方组件库中出现，比如antdv。尽管这个报错不会影响项目的运行，但是在控制台中显示出来可能会让人感到不舒服。所以，为了避免这个报错，建议使用:deep(<inner-selector>)选择器来替代::v-deep选择器。
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在vue2项目中，运行时报[@vue/compiler-sfc] ::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead.

当你在Vue 2项目中看到这样的错误提示`[@vue/compiler-sfc] ::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead.`，它表示你在CSS选择器中使用了`::v-deep`这一组合符，这是一种在Vue 2中深度选择元素的旧写法，已经被废弃了。

Vue团队推荐使用`:deep()`或`>>>`（仅在Webkit浏览器支持）来代替。这两个选择器的作用类似于`::v-deep`，它们可以让样式穿透到嵌套的组件和自定义组件内部，以便更精确地控制样式。

具体操作是将`::v-deep`替换为`:deep(<your-inner-selector>)`，例如：

::v-deep .my-component .nested-element {
  /* 旧写法 */
}

:deep(.my-component .nested-element) {
  /* 新写法 */
}

这样可以确保你的代码兼容性并遵循Vue的最新实践。如果你发现有任何样式没有生效，可能需要检查是否更新了你的选择器语法。