Working around missing manifest.json bug

Author: weaverryan

index.js

@@ -1421,11 +1421,11 @@ class Encore {
      *     // common values: asset, asset/resource, asset/inline
      *     // Using "asset" will allow smaller images to be "inlined"
      *     // instead of copied.
-     *     // javascript/auto caan be used to disable asset images (see next example)
+     *     // javascript/auto can be used to disable asset images (see next example)
      *     type: 'asset/resource',
      *
      *     // applicable when for "type: asset": files smaller than this
-     *     // size will be "inlined" into CSS, larer files will be extracted
+     *     // size will be "inlined" into CSS, larger files will be extracted
      *     // into independent files
      *     maxSize: 4 * 1024, // 4 kb
      *

lib/plugins/clean.js

@@ -27,6 +27,11 @@ module.exports = function(plugins, webpackConfig) {
         return;
     }
 
+    const cleanOnceBeforeBuildPatterns = webpackConfig.cleanWebpackPluginPaths;
+    // works around a bug where manifest.json is emitted when
+    // using dev-server... but then CleanWebpackPlugin deletes it
+    cleanOnceBeforeBuildPatterns.push('!manifest.json');
+
     const cleanWebpackPluginOptions = {
         verbose: false,
         cleanOnceBeforeBuildPatterns: webpackConfig.cleanWebpackPluginPaths,