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I saw there is a js-mode bundled in Emacs. I've also seen a js2-mode. However, I have also seen Emacs git log on js-mode refers to js2-mode bug reports. What is the relationship between them?
In addition to what @wasamasa said, js2-mode derives from js-mode and shares its indentation engine.
Thus, fixing an indentation bug in js-mode fixes it in js2-mode as well.
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