feat(cli): support custom webpack config

packages/vant-cli/src/config/webpack.package.ts

@@ -1,6 +1,7 @@
-import { join } from 'path';
 import merge from 'webpack-merge';
+import { join } from 'path';
 import { baseConfig } from './webpack.base';
+import { getWebpackConfig } from '../common';
 import { LIB_DIR, DIST_DIR, CONFIG_FILE } from '../common/constant';
 
 // eslint-disable-next-line
@@ -8,32 +9,36 @@ const config = require(CONFIG_FILE);
 const { name } = config;
 
 export function packageConfig(isMinify: boolean) {
-  return merge(baseConfig as any, {
-    mode: 'production',
-    entry: {
-      [name]: join(DIST_DIR, 'index.js')
-    },
-    stats: 'none',
-    output: {
-      path: LIB_DIR,
-      library: name,
-      libraryTarget: 'umd',
-      filename: isMinify ? '[name].min.js' : '[name].js',
-      umdNamedDefine: true,
-      // https://github.com/webpack/webpack/issues/6522
-      globalObject: "typeof self !== 'undefined' ? self : this"
-    },
-    externals: {
-      vue: {
-        root: 'Vue',
-        commonjs: 'vue',
-        commonjs2: 'vue',
-        amd: 'vue'
+  return merge(
+    baseConfig as any,
+    {
+      mode: 'production',
+      entry: {
+        [name]: join(DIST_DIR, 'index.js')
+      },
+      stats: 'none',
+      output: {
+        path: LIB_DIR,
+        library: name,
+        libraryTarget: 'umd',
+        filename: isMinify ? '[name].min.js' : '[name].js',
+        umdNamedDefine: true,
+        // https://github.com/webpack/webpack/issues/6522
+        globalObject: "typeof self !== 'undefined' ? self : this"
+      },
+      externals: {
+        vue: {
+          root: 'Vue',
+          commonjs: 'vue',
+          commonjs2: 'vue',
+          amd: 'vue'
+        }
+      },
+      performance: false,
+      optimization: {
+        minimize: isMinify
       }
     },
-    performance: false,
-    optimization: {
-      minimize: isMinify
-    }
-  });
+    getWebpackConfig()
+  );
 }