fix: 修复hardSoureWebpackPlugin在webpack的define插件变化时依然使用cache的bug

默认使用node-object-hash对webpackConfig处理计算hash，插件配置解析为[Object, object]，所以define插件配置发生变化，产生的hash一样

packages/fes-preset-built-in/src/plugins/features/hardSource.js

@@ -1,8 +1,3 @@
-import {
-    winPath
-} from '@umijs/utils';
-import HardSourceWebpackPlugin from 'hard-source-webpack-plugin';
-
 export default (api) => {
     api.describe({
         key: 'hardSource',
@@ -14,12 +9,31 @@ export default (api) => {
     });
 
     api.chainWebpack((webpackConfig) => {
+        const HardSourceWebpackPlugin = require('hard-source-webpack-plugin');
+        const { winPath } = require('@umijs/utils');
+        const crypto = require('crypto');
+        const path = require('path');
+        const { toString } = require('webpack-chain');
         const cwd = api.cwd;
         if (api.env === 'development') {
             webpackConfig
                 .plugin('hardSource')
                 .use(HardSourceWebpackPlugin, [{
                     cacheDirectory: winPath(`${cwd}/.cache/hard-source/[confighash]`),
+                    configHash: (config) => {
+                        const hardSourcePlugin = config.plugins.find(
+                            ({ constructor }) => constructor.name === 'HardSourceWebpackPlugin'
+                        );
+                        const cacheDir = hardSourcePlugin.getCachePath();
+                        const context = path.resolve(process.cwd(), config.context);
+                        const clone = Object.assign({}, config, {
+                            context: path.relative(cacheDir, context)
+                        });
+                        return crypto
+                            .createHash('sha256')
+                            .update(toString(clone))
+                            .digest('hex');
+                    },
                     ...api.config.hardSource || {}
                 }]);
             webpackConfig