v0.13.0 __sapper__ EventStream seems to be borked

[arxpoetica]

It's dumping null messages every so many milliseconds.

See screen recordings:

• http://recordit.co/8zk3wcxEwC and:
• http://recordit.co/7SZiRsz9PQ

I went back and forth determining if it was my project or could be reproduced in https://github.com/sveltejs/sapper-template <- quick note, it can't be reproduced UNLESS YOU UPDATE sapper-template to sapper@0.13.0. Right now it's on v .12: https://github.com/sveltejs/sapper-template/blob/master/package.json#L17

Once you update the Sapper version, sapper-template EventStream __sapper__ network connection gets borked too.

[Rich-Harris]

Absolute facepalm. I rewrote some stuff for 0.13 to break some CLI functionality out into an API that could be used by other clients (i.e. Sapper Studio), and managed to write the following code:

setInterval(() => {
  this.send(null);
}); // <-- look ma, no second argument!

Surprised TypeScript didn't yell at me. Fixed in 0.13.1.