diff --git a/.changeset/pink-adults-provide.md b/.changeset/pink-adults-provide.md
new file mode 100644
index 00000000..bc1f050b
--- /dev/null
+++ b/.changeset/pink-adults-provide.md
@@ -0,0 +1,8 @@
+---
+"@1stg/app-config": patch
+"@1stg/babel-preset": patch
+"@1stg/common-config": patch
+"@1stg/lib-config": patch
+---
+
+fix(babel-preset): enable `allowDeclareFields` with `@babel/plugin-tr…
diff --git a/packages/babel-preset/index.js b/packages/babel-preset/index.js
index 44b33184..59f5c75a 100644
--- a/packages/babel-preset/index.js
+++ b/packages/babel-preset/index.js
@@ -24,6 +24,7 @@ module.exports = declare(
       decoratorsLegacy = true,
       classLoose,
       decoratorsBeforeExport = decoratorsLegacy === true ? undefined : true,
+      allowDeclareFields = true,
     },
   ) => {
     api.assertVersion(7)
@@ -82,12 +83,18 @@ module.exports = declare(
         {
           isTSX,
           allExtensions: isTSX,
-          allowDeclareFields: true,
+          allowDeclareFields,
         },
       ])
     }
 
     const plugins = [
+      [
+        require('@babel/plugin-transform-typescript'),
+        {
+          allowDeclareFields,
+        },
+      ],
       [
         require('@babel/plugin-proposal-decorators'),
         {