Removing empty entities from cluttering configuration object

package.json

@@ -1,6 +1,6 @@
 {
   "name": "webpack-chain",
-  "version": "1.4.2",
+  "version": "1.4.3",
   "main": "src/Config.js",
   "repository": "mozilla-rpweb/webpack-chain",
   "keywords": [

src/Config.js

@@ -58,13 +58,15 @@ class Config {
 
   toConfig() {
     const entries = this.entries.entries();
+    const plugins = this.plugins.values()
+      .map(value => value.init(value.plugin, value.args));
+
     const config = Object.assign({}, this.options.entries(), {
       node: this.node.entries(),
       output: this.output.entries(),
       resolve: this.resolve.toConfig(),
       resolveLoader: this.resolveLoader.toConfig(),
       devServer: this.devServer.entries(),
-      plugins: this.plugins.values().map(value => value.init(value.plugin, value.args)),
       module: this.module.toConfig(),
       entry: entries && Object
         .keys(entries)
@@ -74,6 +76,10 @@ class Config {
         }, {})
     });
 
+    if (plugins.length) {
+      config.plugins = plugins;
+    }
+
     return Object
       .keys(config)
       .reduce((acc, key) => {

src/Resolve.js

@@ -9,10 +9,15 @@ module.exports = class extends ChainedMap {
   }
 
   toConfig() {
-    return Object.assign({
-      modules: this.modules.values(),
-      extensions: this.extensions.values()
-    }, this.entries());
+    const modules = this.modules.values();
+    const extensions = this.extensions.values();
+    const entries = this.entries() || {};
+
+    if (!modules.length && !extensions.length && !Object.keys(entries).length) {
+      return;
+    }
+
+    return Object.assign({ modules, extensions }, entries);
   }
 
   merge(obj) {

src/ResolveLoader.js

@@ -8,9 +8,14 @@ module.exports = class extends ChainedMap {
   }
 
   toConfig() {
-    return Object.assign({
-      modules: this.modules.values()
-    }, this.entries());
+    const modules = this.modules.values();
+    const entries = this.entries() || {};
+
+    if (!modules.length && !Object.keys(entries).length) {
+      return;
+    }
+
+    return Object.assign({ modules }, entries);
   }
 
   merge(obj) {