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On structural level it's exactly 1-1: HumanifyJS only does renames, no refactoring. It may come up with better names for variables than the original code though.

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Can it guarantee 1-1? Doesn't Javascript allow looking up fields using a string name? That string could be computed in a complex manner.

It does in fact change the structure, but only safe-ish AST transformations related to minifiers (e.g. `void 0` to `undefined`): - https://github.com/jehna/humanify/blob/eeff3f8b4f76d40adb116... - https://webcrack.netlify.app/docs/concepts/unminify.html

properties and strings aren't renamed

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