in fact, this kind of problem is already written in the git document, but you may not read the document or ignore it.

.gitignore official document

Example to exclude everything except a specific directory foo/bar (note the / *-without the slash, the wildcard would also exclude everything within foo/bar):

$ cat .gitignore
    -sharp exclude everything except directory foo/bar
    /*
    !/foo
    /foo/*
    !/foo/bar

knowing this, come back to your question

node_modules/
// 
!node_modules/@wang

but you may have ignored the node_modules as a whole before, resulting in adding the exclusion file now, which has no effect.

look at the document again at this time. It is said that you can refer to:

SEE ALSO
git rm official documentation

if you look at it, you can see:

// -r 
// --cached 
git rm -r --cached node_modules/@wang

git status
// 

then you will find that the node_modules/@wang folder is ready to submit.

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