deno per package cache derivations + hashes

shelf/deno/uses-hjq/scroll.nix

@@ -1,3 +1,32 @@
 {
-  cache-command = "deno cache -I --reload main.ts";
+  name = "uses-hjq";
+
+  description = "A test scroll that mimicks hjq's behavior";
+
+  inputs = {
+    stdin = {
+      format = "HJSON";
+      react  = "push";
+    };
+    jqFilter = {
+      format = "string";
+      react  = "push";
+    };
+  };
+
+  outputs = {
+    stdout = {
+      format = "HJSON";
+      react  = "push";
+    };
+  };
+
+  build = {
+    hashFiles = [ ./deno.json ./deno.lock ];
+    cacheCommand = "deno cache --frozen main.ts";
+    knownHashes = {
+      "sha1-uO43Rt1F6+Ud1wk2p9LQhfP180M=" =
+        "sha256-x/Fvn/l3J7C0D7AftlbRk7iuc6o9qPakdnHb72TSxec=";
+    } ; 
+  };
 }