Function like `tmp.open` to create write stream.

tmp.file has some nice advantages (implicit mode and exclusive) but code using the file descriptor from fs.open is rare nowadays.

An alternate version that would return a stream made with fs.createWriteStream would be nice.

[silkentrance]

@dantman I see where you are getting at, would the following API extension suffice?

function tmp.createReadStream(tmpObject) {
  return fs.createReadStream(tmpObject.name, {fd : tmpObject.fd, flags : "r"});
}
function tmp.createWriteStream(tmpObject) {
  return fs.createWriteStream(tmpObject.name, {fd : tmpObject.fd, flags : "a+"});
}

I think that registering event listeners should be left to the client, e.g. error event listener that will automatically cleanup the tmp file and so on…

Problems here might be:

'wx+' - Like 'w+' but fails if path exists.
'ax+' - Like 'a+' but fails if path exists.

Calling the above API multiple times will likely cause an error with the default flags… Would it not suffice that tmp.fileSync() used these flags and possibly failed if the path did already exist, and use createWriteStream as it is, with only the “w+”?

In addition w+ will still truncate the tmp file, do you want this to happen? I think that a+ is the better choice here, is it not?

[dantman]

Huh? No, I want to be able to create a write stream for a temporary file the same way I would create an open fd for a temporary file. With the exact same behaviour. ie: Without suddenly being forced to declare _c.O_CREAT | _c.O_EXCL | _c.O_RDWR and the default mode myself on a nodejs fs call.