diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.js b/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.js
index 975fafbffc0..520f48ab767 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.js
@@ -113,8 +113,7 @@ const getKeyDomains = (keys) => uniq(keys.map(getKeyDomain));
 class RailsI18nWebpackPlugin extends ExtractKeysWebpackPlugin {
   /** @type {RailsI18nWebpackPluginOptions} */
   static DEFAULT_OPTIONS = {
-    template:
-      '!function(){var k,o=%j,l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()',
+    template: '_locale_data=Object.assign(%j,this._locale_data)',
     configPath: path.resolve(process.cwd(), 'config/locales'),
     defaultLocale: 'en',
     onMissingString: () => {},
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.spec.js b/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.spec.js
index d46c64c362d..e89b4c9b8c2 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.spec.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/rails-i18n-webpack-plugin.spec.js
@@ -161,22 +161,22 @@ describe('RailsI18nWebpackPlugin', () => {
             );
 
             expect(manifest).to.deep.equal({
-              'actualmain-3b0c232b.en.js': 'actualmain-3b0c232b.en.js',
-              'actualmain-a43216c8.es.js': 'actualmain-a43216c8.es.js',
+              'actualmain-5b00aabc.en.js': 'actualmain-5b00aabc.en.js',
+              'actualmain-941d1f5f.es.js': 'actualmain-941d1f5f.es.js',
               'actualmain.js': 'actualmain.js',
               entrypoints: {
                 main: {
                   assets: {
                     js: [
                       'actualmain.js',
-                      'actualmain-3b0c232b.en.js',
-                      'actualmain-a43216c8.es.js',
-                      'actualmain-3b0c232b.fr.js',
+                      'actualmain-5b00aabc.en.js',
+                      'actualmain-941d1f5f.es.js',
+                      'actualmain-5b00aabc.fr.js',
                     ],
                   },
                 },
               },
-              'main.js': 'actualmain-3b0c232b.fr.js',
+              'main.js': 'actualmain-5b00aabc.fr.js',
             });
             done();
           } catch (error) {
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.en.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.en.js
index efa2763e950..e9c79acc6a8 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.en.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.en.js
@@ -1 +1 @@
-!function(){var k,o={"forms.button.submit":"Submit","forms.messages":{"one":"One message","other":"%{count} messages"},"forms.key1":"value1-en","forms.key2":"value2-en","item.1":"First","item.2":"Second","item.3":"","forms.button.reset":"Reset"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.button.submit":"Submit","forms.messages":{"one":"One message","other":"%{count} messages"},"forms.key1":"value1-en","forms.key2":"value2-en","item.1":"First","item.2":"Second","item.3":"","forms.button.reset":"Reset"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.es.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.es.js
index 814a80003c2..839199f2238 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.es.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.es.js
@@ -1 +1 @@
-!function(){var k,o={"forms.button.submit":"Enviar","forms.messages":{"one":"Un mensaje","other":"%{count} mensajes"},"forms.key1":"value1-es","forms.key2":"value2-es","item.1":"First","item.2":"Second","item.3":"","forms.button.reset":"Reiniciar"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.button.submit":"Enviar","forms.messages":{"one":"Un mensaje","other":"%{count} mensajes"},"forms.key1":"value1-es","forms.key2":"value2-es","item.1":"First","item.2":"Second","item.3":"","forms.button.reset":"Reiniciar"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.fr.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.fr.js
index da9b0654b94..2b9c238a96e 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.fr.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected1.fr.js
@@ -1 +1 @@
-!function(){var k,o={"forms.button.submit":"Submit","forms.messages":{"one":"Un message","other":"%{count} messages"},"forms.key1":"value1-fr","forms.key2":"value2-fr","item.1":"Premier","item.2":"Second","item.3":"","forms.button.reset":"Réinitialiser"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.button.submit":"Submit","forms.messages":{"one":"Un message","other":"%{count} messages"},"forms.key1":"value1-fr","forms.key2":"value2-fr","item.1":"Premier","item.2":"Second","item.3":"","forms.button.reset":"Réinitialiser"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.en.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.en.js
index 042002cfc7b..7da96c839e7 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.en.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.en.js
@@ -1 +1 @@
-!function(){var k,o={"forms.dynamic":"Dynamic"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.dynamic":"Dynamic"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.es.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.es.js
index d831638ab36..9a114ac5633 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.es.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.es.js
@@ -1 +1 @@
-!function(){var k,o={"forms.dynamic":"Dinámico"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.dynamic":"Dinámico"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.fr.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.fr.js
index 008b99685d7..878d87b2ffd 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.fr.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected452.fr.js
@@ -1 +1 @@
-!function(){var k,o={"forms.dynamic":"Dynamique"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.dynamic":"Dynamique"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.en.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.en.js
index 5d74f558a55..c2fdf8b71ed 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.en.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.en.js
@@ -1 +1 @@
-!function(){var k,o={"forms.button.cancel":"Cancel"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.button.cancel":"Cancel"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.es.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.es.js
index b62d6b49124..b8e17f1742b 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.es.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.es.js
@@ -1 +1 @@
-!function(){var k,o={"forms.button.cancel":"Cancelar"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.button.cancel":"Cancelar"},this._locale_data)
\ No newline at end of file
diff --git a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.fr.js b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.fr.js
index deae187476e..95b04979ff3 100644
--- a/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.fr.js
+++ b/app/javascript/packages/rails-i18n-webpack-plugin/spec/fixtures/expected946.fr.js
@@ -1 +1 @@
-!function(){var k,o={"forms.button.cancel":"Annuler"},l=window._locale_data=window._locale_data||{};for(k in o)l[k]=o[k]}()
\ No newline at end of file
+_locale_data=Object.assign({"forms.button.cancel":"Annuler"},this._locale_data)
\ No newline at end of file