fix(pack): compatWebpack treeshaking config (#2684)

Author: fireairforce

packages/pack-shared/src/webpackCompat.ts

@@ -686,6 +686,7 @@ function compatOptimization(
   }
   const { moduleIds, minimize, concatenateModules, usedExports } =
     webpackOptimization;
+  const enableWebpackUsedExports = usedExports !== false;
   return {
     moduleIds:
       moduleIds === "named"
@@ -696,9 +697,9 @@ function compatOptimization(
     noMangling: webpackOptimization.mangleExports === false,
     minify: minimize,
     concatenateModules,
-    treeShaking: !!usedExports,
-    removeUnusedExports: !!usedExports,
-    removeUnusedImports: !!usedExports,
+    treeShaking: false,
+    removeUnusedExports: enableWebpackUsedExports,
+    removeUnusedImports: enableWebpackUsedExports,
   };
 }