diff --git a/ibexa/commerce/4.6/encore/ibexa.webpack.custom.configs.js b/ibexa/commerce/4.6/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/commerce/4.6/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/commerce/4.6/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/commerce/5.0/encore/ibexa.webpack.custom.configs.js b/ibexa/commerce/5.0/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/commerce/5.0/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/commerce/5.0/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/experience/4.6/encore/ibexa.webpack.custom.configs.js b/ibexa/experience/4.6/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/experience/4.6/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/experience/4.6/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/experience/5.0/encore/ibexa.webpack.custom.configs.js b/ibexa/experience/5.0/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/experience/5.0/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/experience/5.0/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/headless/4.6/encore/ibexa.webpack.custom.configs.js b/ibexa/headless/4.6/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/headless/4.6/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/headless/4.6/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/headless/5.0/encore/ibexa.webpack.custom.configs.js b/ibexa/headless/5.0/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/headless/5.0/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/headless/5.0/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/oss/4.6/encore/ibexa.webpack.custom.configs.js b/ibexa/oss/4.6/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/oss/4.6/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/oss/4.6/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }
diff --git a/ibexa/oss/5.0/encore/ibexa.webpack.custom.configs.js b/ibexa/oss/5.0/encore/ibexa.webpack.custom.configs.js
index e8f46aaa..3797276f 100644
--- a/ibexa/oss/5.0/encore/ibexa.webpack.custom.configs.js
+++ b/ibexa/oss/5.0/encore/ibexa.webpack.custom.configs.js
@@ -1,8 +1,13 @@
+const Encore = require('@symfony/webpack-encore');
 const customConfigs = require('./var/encore/ibexa.webpack.custom.config.js');
 
 module.exports = customConfigs.reduce((configs, customConfigPath) => {
     let customConfig = require(customConfigPath);
 
+    if (typeof customConfig === 'function') {
+        customConfig = customConfig(Encore);
+    }
+
     if (!Array.isArray(customConfig)) {
         customConfig = [customConfig];
     }