fix: mutil compiler babel env invalid

Author: hubcarl

lib/base.js

@@ -588,14 +588,17 @@ class WebpackBaseBuilder extends Config {
 
   createBabelLoader() {
     const loaderName = 'babel-loader';
+    const options = { forceEnv: process.env.BABEL_ENV };
     const compile = this.config.compile || {};
-    const config = compile.cache ? this.createCacheLoader(compile.cache, loaderName) : { loader: loaderName, options: {} };
+    const configCacheOptions = this.utils.isObject(compile.cache) ? compile.cache : {};
+    const cacheOptions = this.merge(options, configCacheOptions);
+    const config = compile.cache ? this.createCacheLoader(cacheOptions, loaderName) : { loader: loaderName, options };
     // use project .babelrc
     if (fs.existsSync(this.projectBabelrc)) {
       return config;
     }
     // use default babelrc
-    return this.merge(config, { options : this.babelConfig });
+    return this.merge(config, this.merge(options, this.babelConfig));
   }
 
   createCacheLoader(loaderOptions, name) {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "easywebpack",
-  "version": "4.9.0-rc.3",
+  "version": "4.9.0-rc.4",
   "description": "基于 Webpack 的前端构建工程化解决方案",
   "keywords": [
     "webpack",