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> Look at collector.js, in the first dozen characters it's already using ECMAScript 6 standards like promises.

According to caniuse, promises are supported by Chrome since v33, by Edge since v12, by Firefox since v29, and by Safari since 7.1.

https://caniuse.com/promises

Both Chrome 33 and Firefox 29 were released in 2014.



You are gently omitting IE which doesn't have this at all. Doesn't matter when others were released, at that time IE had a market share that was non-neligible.




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