[OPTIONS] Restore plugins option

Author: lihqi

README.md

@@ -186,6 +186,12 @@ webWorkerLoader({
     loadPath?: string,              // This option is useful when the worker scripts need to be loaded from another folder.
                                     // Default: ''
 
+    plugins?: Array,                // An array of extra plugins to use while compiling the worker code. Used to apply 
+                                    // transformations to the worker code and not the main code (i.e. minify)
+                                    // NOTE: these plugins be added to the rollup process on top of the plugins in the
+                                    // default configuration.
+                                    // Default: []
+                                    
     skipPlugins?: Array             // Plugin names to skip for web worker build
                                     // Default: [ 'liveServer', 'serve', 'livereload' ]
 })

src/index.js

@@ -23,6 +23,7 @@ const defaultConfig = {
     external: undefined,
     extensions: [ '.js' ],
     outputFolder: '',
+    plugins: [],
     skipPlugins: [
         'liveServer',
         'serve',

src/plugin/options.js

@@ -11,6 +11,7 @@ function optionsImp(state, config, options) {
                 }
                 plugins.push(plugin);
             });
+            plugins.push(...config.plugins);
             state.options.plugins = plugins;
 
             const cwd = process.cwd();