From d44fe70eda258764a4ca7707059a5eb8fd25cf58 Mon Sep 17 00:00:00 2001
From: Thales Macedo Garitezi <16166434+thalesmg@users.noreply.github.com>
Date: Thu, 17 Apr 2025 14:08:29 -0300
Subject: [PATCH] feat(computed fields): add option to avoid computing computed
 fields

Part of https://github.com/emqx/emqx/pull/15039#discussion_r2049277150
---
 src/hocon_tconf.erl        |  2 ++
 test/hocon_tconf_tests.erl | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/hocon_tconf.erl b/src/hocon_tconf.erl
index 3e7dc10..27c3791 100644
--- a/src/hocon_tconf.erl
+++ b/src/hocon_tconf.erl
@@ -524,6 +524,8 @@ map_one_field_non_hidden(FieldType, FieldSchema, FieldValue0, Opts) ->
 
 maybe_computed(_FieldSchema, CheckedValue, #{make_serializable := true}) ->
     CheckedValue;
+maybe_computed(_FieldSchema, CheckedValue, #{computed_fields := false}) ->
+    CheckedValue;
 maybe_computed(FieldSchema, #{} = CheckedValue, #{format := map} = Opts) ->
     case field_schema(FieldSchema, computed) of
         Fn when is_function(Fn, 2) ->
diff --git a/test/hocon_tconf_tests.erl b/test/hocon_tconf_tests.erl
index fa89028..39310d6 100644
--- a/test/hocon_tconf_tests.erl
+++ b/test/hocon_tconf_tests.erl
@@ -2783,4 +2783,24 @@ computed_fields_test() ->
     Res4 = #{} = hocon_tconf:check_plain(Sc, RichmapData, #{format => richmap}),
     AssertNoComputed(Res4),
 
+    %% Option to not compute computed fields.
+    Res5 = hocon_tconf:check_plain(Sc, Data, #{computed_fields => false}),
+    ?assertEqual(
+        #{
+            <<"root">> =>
+                #{
+                    <<"bar">> => 123,
+                    <<"baz">> =>
+                        #{
+                            <<"quux">> => 666
+                        },
+                    <<"bag">> =>
+                        #{
+                            <<"key">> => <<"value">>
+                        }
+                }
+        },
+        Res5
+    ),
+
     ok.