!1025 Fix clean webpack of esmodule

Merge pull request !1025 from zrg/fix_clean_webpack_module

compiler/src/gen_abc_plugin.ts

@@ -143,6 +143,7 @@ export class GenAbcPlugin {
     }
 
     if (projectConfig.compileMode === ESMODULE) {
+      removeDir(output);
       removeDir(projectConfig.nodeModulesPath);
     }
 

compiler/webpack.config.js

@@ -346,6 +346,9 @@ function setGenAbcPlugin(env, config) {
 }
 
 function setCleanWebpackPlugin(workerFile, config) {
+  if (projectConfig.compileMode === 'esmodule') {
+    return;
+  }
   let cleanPath = [];
   cleanPath.push(projectConfig.buildPath);
   if (workerFile) {