initial commit

lib/install-cache.nix

@@ -0,0 +1,34 @@
+{ pkgs, cache }:
+
+pkgs.writeShellScriptBin "install-deno-cache" ''
+  set -euo pipefail
+
+  if [ -z "''${DENO_DIR:-}" ]; then
+    echo "Error: DENO_DIR environment variable must be set" >&2
+    exit 1
+  fi
+
+  echo "Installing Deno cache to: $DENO_DIR"
+
+  # Remove existing cache if it exists
+  if [ -d "$DENO_DIR" ]; then
+    echo "Removing existing cache..."
+    rm -rf "$DENO_DIR"
+  fi
+
+  # Copy the shared cache, dereferencing symlinks
+  if [ -d "${cache}" ]; then
+    echo "Copying shared cache..."
+    mkdir -p "$(dirname "$DENO_DIR")"
+    cp -rL "${cache}" "$DENO_DIR"
+    chmod -R u+w "$DENO_DIR"
+    echo "Cache installed successfully!"
+  else
+    echo "No shared cache found at ${cache}"
+    mkdir -p "$DENO_DIR"
+  fi
+
+  if [ -d "$DENO_DIR/npm" ]; then
+    echo "NPM packages in cache: $(find "$DENO_DIR/npm" -name "package.json" | wc -l)"
+  fi
+''

lib/lockfile-to-npm-deps.nix

@@ -0,0 +1,56 @@
+{ self }:
+{ pkgs, lockfile }:
+let
+  registry = self.denoNpmRegistryHostname;
+
+  # Extract npm dependencies from a single lockfile
+  extractNpmDeps = lockfile:
+    let
+      lockJSON = builtins.fromJSON (builtins.readFile lockfile);
+    in
+      lockJSON.npm or {};
+
+  npmDeps = extractNpmDeps lockfile;
+
+  # Create tarball derivation for a package
+  mkTarballDrv = { name, version, integrity }:
+    let
+      tarballName =
+        if builtins.substring 0 1 name == "@" 
+        then builtins.baseNameOf name  # "@types/node" → "node"
+        else name;
+    in
+      pkgs.fetchurl {
+        url = "https://${registry}/${name}/-/${tarballName}-${version}.tgz";
+        hash = integrity;
+      };
+
+  # Create derivation for a single npm package
+  mkNpmDep = key: value:
+    let
+      match = builtins.match "(.+)@(.+)" key;
+      name = builtins.elemAt match 0;
+      version = builtins.elemAt match 1;
+    in
+    pkgs.stdenv.mkDerivation {
+      pname = "deno-npm-${builtins.replaceStrings ["@" "/"] ["" "-"] name}";
+      version = version;
+      src = mkTarballDrv {
+        inherit name version; 
+        inherit (value) integrity;
+      };
+
+      installPhase = ''
+        runHook preInstall
+
+        export OUT_PATH="$out/npm/${registry}/${name}/${version}"
+
+        mkdir -p $OUT_PATH
+        tar -xzf $src -C $OUT_PATH --strip-components=1
+
+        runHook postInstall
+      '';
+    };
+
+in
+pkgs.lib.mapAttrsToList mkNpmDep npmDeps

lib/shared-cache.nix

@@ -0,0 +1,13 @@
+{ self }:
+{ pkgs, lockfiles }:
+let
+  allNpmDeps = builtins.concatMap
+    (lockfile:
+      self.denoLockfileToNpmDeps { inherit pkgs lockfile; })
+    lockfiles;
+
+in
+pkgs.symlinkJoin {
+  name = "deno-shared-cache";
+  paths = allNpmDeps;
+}