✏️ Editing: README.md Read Only

Like FS streams, but with stat on them, and supporting directories and
symbolic links, as well as normal files.  Also, you can use this to set
the stats on a file, even if you don't change its contents, or to create
a symlink, etc.

So, for example, you can "write" a directory, and it'll call `mkdir`.  You
can specify a uid and gid, and it'll call `chown`.  You can specify a
`mtime` and `atime`, and it'll call `utimes`.  You can call it a symlink
and provide a `linkpath` and it'll call `symlink`.

Note that it won't automatically resolve symbolic links.  So, if you
call `fstream.Reader('/some/symlink')` then you'll get an object
that stats and then ends immediately (since it has no data).  To follow
symbolic links, do this: `fstream.Reader({path:'/some/symlink', follow:
true })`.

There are various checks to make sure that the bytes emitted are the
same as the intended size, if the size is set.

## Examples

```javascript
fstream
  .Writer({ path: "path/to/file"
          , mode: 0755
          , size: 6
          })
  .write("hello\n")
  .end()
```

This will create the directories if they're missing, and then write
`hello\n` into the file, chmod it to 0755, and assert that 6 bytes have
been written when it's done.

```javascript
fstream
  .Writer({ path: "path/to/file"
          , mode: 0755
          , size: 6
          , flags: "a"
          })
  .write("hello\n")
  .end()
```

You can pass flags in, if you want to append to a file.

```javascript
fstream
  .Writer({ path: "path/to/symlink"
          , linkpath: "./file"
          , SymbolicLink: true
          , mode: "0755" // octal strings supported
          })
  .end()
```

If isSymbolicLink is a function, it'll be called, and if it returns
true, then it'll treat it as a symlink.  If it's not a function, then
any truish value will make a symlink, or you can set `type:
'SymbolicLink'`, which does the same thing.

Note that the linkpath is relative to the symbolic link location, not
the parent dir or cwd.

```javascript
fstream
  .Reader("path/to/dir")
  .pipe(fstream.Writer("path/to/other/dir"))
```

This will do like `cp -Rp path/to/dir path/to/other/dir`.  If the other
dir exists and isn't a directory, then it'll emit an error.  It'll also
set the uid, gid, mode, etc. to be identical.  In this way, it's more
like `rsync -a` than simply a copy.

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