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This website uses vanilla JS and modules. It does not use any build system (such as npm, yarn or deno).
It need nothing to install and you can even develop from your browser directly !
But Why is there some deno stuff ? Deno is only used for tests and to run a very small server locally (do not import deno stuff in production modules).
If you want to run the server locally, you will need to install deno.
deno run --allow-net --allow-read server.ts
If you want to run tests, you will need to install deno.
Run tests :
deno test
# continuously
deno test --watch