fix: prevent devServer.before from being overridden by user config

Author: fengzilong

examples/simple/nut.config.js

@@ -48,7 +48,10 @@ module.exports = {
   devServer: {
     proxy: {
       '/api': 'http://127.0.0.1:7000'
-    }
+    },
+    before() {
+      console.log( 'dev server before' )
+    },
   },
   sidebar: null,
   landing: {

packages/cli/lib/commands/dev.js

@@ -177,6 +177,17 @@ async function dev( cliOptions = {} ) {
   }
 
   if ( nutConfig.devServer ) {
+    const userDevServerBefore = nutConfig.devServer.before
+    const nutDevServerBefore = devServerOptions.before
+
+    if ( userDevServerBefore ) {
+      devServerOptions.before = function ( ...args ) {
+        nutDevServerBefore( ...args )
+        return userDevServerBefore( ...args )
+      }
+
+      delete nutConfig.devServer.before
+    }
     devServerOptions = Object.assign( devServerOptions, nutConfig.devServer )
   }