change the packages install method

packages/chart/index.js

@@ -14,8 +14,7 @@ const install = function(DC) {
 
   DC.init(() => {
     try {
-      const components = require('./src/components.js').default
-      DC.mixin(components)
+      DC.mixin(require('./src/components.js').default)
     } catch (e) {
       // eslint-disable-next-line no-console
       console.error(e)

packages/core/index.js

@@ -16,8 +16,7 @@ const install = function(DC) {
       if (!DC.Initialized) {
         DC.init(() => {
           try {
-            const components = require('./src/components.js').default
-            DC.mixin(components)
+            DC.mixin(require('./src/components.js').default)
             DC.Initialized = true
             callback && callback()
           } catch (e) {

packages/mapv/index.js

@@ -12,8 +12,7 @@ const install = function(DC) {
     try {
       let mapv = require('mapv-lib')
       DC.Namespace['mapv'] = mapv
-      const components = require('./src/components.js').default
-      DC.mixin(components)
+      DC.mixin(require('./src/components.js').default)
       DC.mixin({
         MapvDataSet: mapv?.DataSet
       })