fs.writeFile callback has no error when writing file failed

[apoliszk]

• Version: v8.1.2
• Platform: win10 64bit

var fs = require('fs');

fs.writeFile('test: abc.js', 'aaaa', function (err) {
 debugger;
});

The filename has a colon which is not allowed on win10.
The piece of code wrote a file named test which suppose to be test: abc.js, and there was no content.
The execution was failed, but there was no error. Parameter err is null.

[XadillaX]

@apoliszk how about v6 and v4?

[XadillaX]

It seems CreateFileW (Refer here) don't support :. I'll try to work for it.

[bzoz]

This is a lesser known feature of Windows - alternative data streams. You can read more about them in this MSDN article.

The data is there:

D:\>node -e "require('fs').writeFile('testfile:abc', 'some data', console.log)"
null

D:\>dir /r testfile
 Volume in drive D is Staff
 Volume Serial Number is 565B-E08C

 Directory of D:\

27.06.2017 10:49 0 testfile
 9 testfile:abc:$DATA
 1 File(s) 0 bytes
 0 Dir(s) 10 776 190 976 bytes free

D:\>more < testfile

D:\>more < testfile:abc
some data

[bzoz]

Also, note that for other chars Node fails as expected:

D:\>node -e "require('fs').writeFile('testfile>abc', 'some data', console.log)"
{ Error: ENOENT: no such file or directory, open 'D:\testfile>abc'
 errno: -4058,
 code: 'ENOENT',
 syscall: 'open',
 path: 'D:\\testfile>abc' }

[apoliszk]

Thanks everyone.
I got it.
It is how windows is designed, not a bug.