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That's a good suggestion but it looks like the minifier removes "continue" automatically: https://raw.githubusercontent.com/muicss/loadjs/master/dist/...

Arrow functions would be great but then we'd have to drop support for browsers that don't support ES6.

It seems running your original code through the closure compiler shaves it down to 488 max.

The closure compiler doesn't respect arrow functions, so I'm assuming that'd have to be changed manually.