Commits on Sep 28, 2022

1. edge-ssr: bundle next/dist as ESM for better tree-shaking (vercel#40251) …

   Edge SSR'd routes cold boot performances are proportional to the
   executed code size.
   
   In order to improve it, we are trying to optimize for the bundle size of
   a packed Edge SSR route.
   
   This PR adds ESM compilation targets for all Next.js dist packages and
   use them to bundle Edge SSR'd route.
   
   This allows us to leverage the better tree shaking/DCE for ESM modules
   in webpack in order to decrease the overall bundle size.
   
   This PR also enables minifying Edge SSR routes. Since we don't control
   which minifier might be used later (if any), it's best if we provide an
   already optimised bundle.
   
   <img width="903" alt="image"
   src="https://user-images.githubusercontent.com/11064311/190005211-b7cb2c58-a56a-44b0-8ee4-fd3f603e41bd.png">
   
   This is a 10ms cold boot win per my benchmarking script, which I'll put
   in a subsequent PR.
   
   Not done yet:
   - ~~swap exported requires in `next/link` (and others) etc to point them
   to the esm modules version~~
   
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   - [ ] Related issues linked using `fixes #number`
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   - [x] Implements an existing feature request or RFC. Make sure the
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   - [ ] Related issues linked using `fixes #number`
   - [ ] Integration tests added
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   - [ ] Make sure the linting passes by running `pnpm lint`
   - [ ] The examples guidelines are followed from [our contributing
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   Co-authored-by: JJ Kasper <jj@jjsweb.site>
   Co-authored-by: Shu Ding <g@shud.in>

   

   3 people committed Sep 28, 2022
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