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5to6's Issues

Unsafe to transform function(){} into ()=>{} without checking for `this` usage

If a function uses this,

document.addEventListener('load', function () { this.getElementById(...) })

then turning it into an arrow function is unsafe and shouldn't be done, lest all references to this will be potentially wrong.

document.addEventListener('load', () => { this.getElementById(...) }) // oops! "this" is the window!

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