Prepack Wasn't Dropped for Being Too Hard—Its Output Was Never Worth It
cnakazawa · x · 2026-11-06
Developer sebmck clears up a long-standing engineering-history misconception: Meta's JavaScript pre-optimization tool Prepack wasn't abandoned because it was "too hard" to build or its interpreter too difficult—it was dropped because it produced an enormous amount of JavaScript that was never worth evaluating over the original source code. A useful correction to a widely repeated claim.
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