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Framework Next.js 13 Advance
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What does NextJS .prepare() actually do?

javascript - What does NextJS .prepare() actually do? - Stack Overflow

it does 5 things in this order in an async/await fashion

  1. Verify TypeScript Setup
  2. load Custom Routes
  3. add ExportPathMap to Routes Makes next export exportPathMap work in development mode. So that the user doesn’t have to define a custom server reading the exportPathMap
  4. start hotReloader
  5. records telemetry [source code]