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Isn't that just on the cold start?

Each subsequent request would not need to go through that process as long as the lambda function was warm, right?

The author didn't bundle, so it's like running `npm install && npm run build` on every start

Aside: if you're doing that in production, save yourself some headache and use `npm ci && npm run build` instead; `npm install` chooses dependencies based on your package.json, not your lockfile.

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