fix dayjs is not excluded in dist (#6767)

Author: shifeng1993

webpack.build.conf.js

@@ -14,14 +14,15 @@ function addLocales(webpackConfig) {
 }
 
 function externalDayjs(config) {
-  config.externals.dayjs = {
+  config.externals.push({
     dayjs: {
       root: 'dayjs',
       commonjs2: 'dayjs',
       commonjs: 'dayjs',
       amd: 'dayjs',
+      module: 'dayjs',
     },
-  };
+  });
   config.externals.push(function ({ _context, request }, callback) {
     if (/^dayjs\/plugin\//.test(request)) {
       const name = request.replace(/\//g, '_');
@@ -30,6 +31,7 @@ function externalDayjs(config) {
         commonjs2: name,
         commonjs: name,
         amd: name,
+        module: name,
       });
     }
     callback();