fix(serve): native modules on windows

Author: nklayman

lib/webpackConfig.js

@@ -22,7 +22,9 @@ async function chainWebpack (api, pluginOptions, config) {
       process.env.VUE_APP_NODE_MODULES_PATH = false
     } else if (process.env.NODE_ENV === 'development') {
       // Set node_modules path for externals
-      process.env.VUE_APP_NODE_MODULES_PATH = api.resolve('./node_modules')
+      process.env.VUE_APP_NODE_MODULES_PATH = api
+        .resolve('./node_modules')
+        .replace(/\\/g, '/')
       //   Set __static to absolute path to public folder
       config.plugin('define').tap(args => {
         args[0].__static = JSON.stringify(api.resolve('./public'))