deno per package cache derivations + hashes

shelf/deno/hjq/scroll.nix

@@ -8,7 +8,7 @@
       format = "HJSON";
       react  = "push";
     };
-    jq_filter = {
+    jqFilter = {
       format = "string";
       react  = "push";
     };
@@ -20,6 +20,13 @@
       react  = "push";
     };
   };
-  
-  cache-command = "deno cache --reload main.ts";
+
+  build = {
+    hashFiles = [ ./deno.json ./deno.lock ];
+    cacheCommand = "deno cache --frozen main.ts";
+    knownHashes = {
+      "sha1-gSeoE0sSj+dFQ7SUoyaQV0X/KJE=" =
+        "sha256-0ZfdWVfShbhgAoSse9vEpFPRh5XTTVjgxGMmezwon9I=";
+    };
+  };
 }