Add Jason dependency for Elixir <= 1.17 (#90)

Fixes #81

Author: magnetised

lib/phoenix/sync/sandbox/producer.ex

@@ -13,6 +13,8 @@ if Phoenix.Sync.sandbox_enabled?() do
     alias Electric.Replication.LogOffset
     alias Electric.Replication.ShapeLogCollector
 
+    @json if(Code.ensure_loaded?(JSON), do: JSON, else: Jason)
+
     def child_spec(opts) do
       {:ok, stack_id} = Keyword.fetch(opts, :stack_id)
 
@@ -164,11 +166,11 @@ if Phoenix.Sync.sandbox_enabled?() do
       type.to_iso8601(datetime)
     end
 
-    defp dump(map, _type) when is_map(map), do: JSON.encode!(map)
+    defp dump(map, _type) when is_map(map), do: @json.encode!(map)
 
     defp dump(list, type) when is_list(list) do
       if encode_list_json?(type) do
-        JSON.encode!(list)
+        @json.encode!(list)
       else
         encode_array(list, type)
       end

mix.exs

@@ -44,7 +44,7 @@ defmodule Phoenix.Sync.MixProject do
       {:ecto_sql, "~> 3.10", optional: true},
       {:electric, "~> 1.1.2", optional: true},
       {:electric_client, "~> 0.7"}
-    ] ++ deps_for_env(Mix.env())
+    ] ++ deps_for_env(Mix.env()) ++ json_deps()
   end
 
   defp deps_for_env(:test) do
@@ -68,6 +68,16 @@ defmodule Phoenix.Sync.MixProject do
     []
   end
 
+  defp json_deps do
+    if Code.ensure_loaded?(JSON) do
+      # elixir >= 1.18
+      []
+    else
+      # elixir <= 1.17
+      [{:jason, "~> 1.0"}]
+    end
+  end
+
   defp aliases do
     [
       "test.all": ["test", "test.as_a_dep", "test.apps"],