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.gitignore

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+*.js
+*.~undo-tree~
+*.agdai

basic.agda

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+module basic where
+
+open import Agda.Primitive renaming (Set to Type)
+open import Agda.Builtin.Float
+open import Agda.Builtin.String
+open import Agda.Builtin.IO
+open import Agda.Builtin.Unit
+
+postulate
+  HTTPModule : Type
+  http : HTTPModule
+  HTTPServer : Type
+  HTTPReq : Type
+  HTTPRes : Type
+  modify : Type → Type
+  modLog : {A : Type} → modify A
+  setStatusCode : Float → modify HTTPRes
+  setHeader : String → String → modify HTTPRes
+  setEnd : String → modify HTTPRes
+  pure : {A : Type} → A → modify A
+  _>>=_ : {A : Type} → modify A → (A → modify A) → modify A
+  _>>_ : {A : Type} → modify A → modify A → modify A
+  createServer : HTTPModule → (HTTPReq → modify HTTPRes) → HTTPServer
+  serverListen : HTTPServer → Float → String → IO ⊤ → IO ⊤
+  doNothing : IO ⊤
+  putStrLn : String → IO ⊤
+
+{-# COMPILE JS putStrLn = (str) => { console.log(str); } #-}
+  
+{-# COMPILE JS http = require('http') #-}
+
+{-# COMPILE JS setStatusCode = ((float) => { return (res) => { res.statusCode = float; }}) #-}
+{-# COMPILE JS setHeader = ((header) => { return (content) => { return (res) => { res.setHeader(header, content); }}}) #-}
+{-# COMPILE JS setEnd = ((content) => { return (res) => { res.end(content); }}) #-}
+
+{-# COMPILE JS modLog = ((a) => { return (res) => { console.log(res); }}) #-}
+{-# COMPILE JS pure = ((a) => { return (res) => { return structuredClone(a); }}) #-}
+{-# COMPILE JS _>>=_ = ((a) => { return (ma) => { return (amb) => { return (res) => { amb(ma(res)); }}}}) #-}
+{-# COMPILE JS _>>_ = ((a) => { return (ma) => { return (mb) => { return (res) => { ma(res); mb(res); }}}}) #-}
+
+{-# COMPILE JS createServer = ((http) => { return (handler) => { return http.createServer((req, res) => { handler(req)(res); }); }}) #-}
+{-# COMPILE JS serverListen = ((serv) => { return (port) => { return (host) => { return (action) => { return () => { serv.listen(port, host, action) }}}}}) #-}
+
+{-# COMPILE JS doNothing = (() => {}) #-}
+
+port : Float
+port = 3000.0
+
+hostname : String
+hostname = "localhost"
+
+handleReg : modify HTTPRes
+handleReg = do
+  setStatusCode 200.0
+  setHeader "Content-Type" "text/plain"
+  setEnd "Hello World"
+
+server : HTTPServer
+server = createServer http (λ _ → handleReg)
+
+main : IO ⊤
+main = serverListen server port hostname (putStrLn "served request")

shell.nix

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+let pkgs = import <nixpkgs> {};
+in with pkgs; mkShell {
+  packages = [
+    agda
+    nodejs
+  ];
+
+  shellHook = ''
+  rename() {
+    for f in *.js; do sed -i 's/require("\(.*\)");/require(".\/\1");/g' "$f"; done
+  }
+  '';
+}