Deep error

In the use of deep The following errors may appear when , It is possible that your project will run too slowly
The following is the general error report

 57% building 4/5 modules 1 active ...dex=0&id=012f2ee6&scoped=true&lang=
 css&[@vue/compiler-sfc] the >>> and /deep/ combinators have been 
 deprecated. Use :deep() instead.

Prompt during error reporting ：Use :deep() instead.
resolvent ：
:deep Instead of the original /deep/