Broken on Firefox

FF: Mozilla Firefox 50.0
Svelte: svelte-cli version 1.0.2
Command: svelte compile --format iife HelloWorld.html > HelloWorld.js

Background

After seeing your project on Hacker News, I decided to give it a shot. I use Firefox on Arch Linux, and I was surprised when the "Hello world" demo didn't work. To test it wasn't just my system, I tried it on chromium, and it worked fine there. Are you not supporting Firefox? (it is definitely a "legacy" browser)

Error

The problem is in the generated HelloWorld.js. It is located in var HelloWorld -> function HelloWorld -> function dispatchObservers -> for ( const key in group ). The error message reads SyntaxError: missing = in const declaration.

I hope this is just some obvious issue on my half, and not a lack of Firefox support...

[Rich-Harris]

Ah, whoops! ES2015 habits are hard to break – Svelte is supposed to generate ES5 code but my fingers have forgotten how to type var. Should be a nice easy fix 😀

The real trick will be implementing automated tests to stop this from happening again.