sapper/site/content/docs/09-building.md

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Building

Up until now we've been using sapper dev to build our application and run a development server. But when it comes to production, we want to create a self-contained optimized build.

sapper build

This command packages up your application into the __sapper__/build directory. (You can change this to a custom directory, as well as controlling various other options — do sapper build --help for more information.)

The output is a Node app that you can run from the project root:

node __sapper__/build