Remove reference to fork middleware in library preset by prompoting m…

…ultiple webpack outputs (#1127)

* Remove reference to fork middleware in library preset by prompoting multiple webpack outputs

* Document multiple builds from usage

docs/usage.md

@@ -228,6 +228,28 @@ module.exports = {
 }
 ```
 
+## Generating multiple builds
+
+Webpack supports the ability to run multiple builds by exporting an array of
+configurations instead of a single configuration. You can also use Neutrino to
+drive this process by exporting multiple Neutrino configuration outputs from a
+`webpack.config.js` or by calling `webpack` multiple times.
+
+```js
+// webpack.config.js
+const neutrino = require('neutrino');
+
+const config = neutrino().webpack();
+
+module.exports = [
+  // first build configuration
+  config,
+
+  // second build configuration
+  { ...config, libraryTarget: 'commonjs2' },
+];
+```
+
 ## Inspecting the generated webpack config
 
 The `neutrino --inspect` command can be used to write out a stringified version of the generated

packages/library/README.md

@@ -393,32 +393,34 @@ require(['redux', 'redux-example'], ({ createStore }, reduxExample) => {
 
 ## Generating multiple builds
 
-The `@neutrinojs/library` middleware can be used in conjunction with the
-[`@neutrinojs/fork` middleware](https://neutrinojs.org/packages/fork/) to generate multiple library outputs
-when building. Follow the instructions to install the fork middleware, and change your `.neutrinorc.js`
-format as follows:
+A library can be built multiple times from a `webpack.config.js` file in order to
+generate multiple library outputs when building. This is done by exporting
+an array of Neutrino outputs rather than a single output.
 
 ```js
-const name = 'Logger';
-
+// .neutrinorc.js
 module.exports = {
   use: [
-    (neutrino) => {
-      neutrino.on('prebuild', () => neutrino.use('@neutrinojs/clean'));
-    },
-    ['@neutrinojs/fork', {
-      configs: {
-        // Create a named entry for each build type.
-        // You will most likely want to disable cleaning
-        // the output directory until prior to building
-        umd: ['@neutrinojs/library', { name, clean: false }],
-        commonjs2: ['@neutrinojs/library', { name, clean: false }]
-      }
+    ['@neutrinojs/library', {
+      name: 'Logger',
+      clean: false
     }]
   ]
 };
 ```
 
+```js
+// webpack.config.js
+const neutrino = require('neutrino');
+
+const config = neutrino().webpack();
+
+module.exports = [
+  config,
+  { ...config, libraryTarget: 'commonjs2' }
+];
+```
+
 ### Rules
 
 The following is a list of rules and their identifiers which can be overridden: