Allow to add extra plugin

index.js

@@ -135,6 +135,21 @@ module.exports = {
         return this;
     },
 
+    /**
+     * Add a plugin to the sets of plugins already registered by Encore
+     *
+     * For example, if you want to add the "webpack.IgnorePlugin()", then:
+     *      .addPlugin(new webpack.IgnorePlugin(requestRegExp, contextRegExp))
+     *
+     * @param {string} plugin
+     * @return {exports}
+     */
+    addPlugin(plugin) {
+        webpackConfig.addPlugin(plugin);
+
+        return this;
+    },
+
     /**
      * Adds a custom loader config
      *

lib/WebpackConfig.js

@@ -36,6 +36,7 @@ class WebpackConfig {
         this.manifestKeyPrefix = null;
         this.entries = new Map();
         this.styleEntries = new Map();
+        this.plugins = [];
         this.useVersioning = false;
         this.useSourceMaps = false;
         this.usePostCssLoader = false;
@@ -158,6 +159,10 @@ class WebpackConfig {
         this.styleEntries.set(name, src);
     }
 
+    addPlugin(plugin) {
+        this.plugins.push(plugin);
+    }
+
     addLoader(loader) {
         this.loaders.push(loader);
     }

lib/config-generator.js

@@ -411,6 +411,10 @@ class ConfigGenerator {
             plugins.push(new AssetOutputDisplayPlugin(outputPath, friendlyErrorsPlugin));
         }
 
+        this.webpackConfig.plugins.forEach(function(plugin) {
+            plugins.push(plugin);
+        });
+
         return plugins;
     }
 

test/WebpackConfig.js

@@ -14,6 +14,7 @@ const WebpackConfig = require('../lib/WebpackConfig');
 const RuntimeConfig = require('../lib/config/RuntimeConfig');
 const path = require('path');
 const fs = require('fs');
+const webpack = require('webpack');
 
 function createConfig() {
     const runtimeConfig = new RuntimeConfig();
@@ -277,6 +278,19 @@ describe('WebpackConfig object', () => {
         });
     });
 
+    describe('addPlugin', () => {
+        it('extends the current registered plugins', () => {
+            const config = createConfig();
+            const nbOfPlugins = config.plugins.length;
+
+            expect(nbOfPlugins).to.equal(0);
+
+            config.addPlugin(new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/));
+
+            expect(config.plugins.length).to.equal(1);
+        });
+    });
+
     describe('addLoader', () => {
         it('Adds a new loader', () => {
             const config = createConfig();

test/config-generator.js

@@ -500,4 +500,18 @@ describe('The config-generator function', () => {
             expect(actualConfig.devServer.publicPath).to.equal('/subdirectory/build/');
         });
     });
+
+    describe('test for addPlugin config', () => {
+        it('extra plugin is set correctly', () => {
+            const config = createConfig();
+            config.outputPath = '/tmp/public/build';
+            config.setPublicPath('/build/');
+            config.addPlugin(new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/));
+
+            const actualConfig = configGenerator(config);
+
+            const ignorePlugin = findPlugin(webpack.IgnorePlugin, actualConfig.plugins);
+            expect(ignorePlugin).to.not.be.undefined;
+        });
+    });
 });