Make rebuilds without code changes take less time #1086
+25
−7
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build.js
is unconditionally writing/touching source files, which results in some unnecessary recompilation locally. instead let's compare old/new contents and only write if we need to/touch if things have changed.Drops the rebuild time (with no code changes) from ~45s to ~15s on my m2 mbp.
probably something best done via buck longer term, but this felt like a pretty easy change.