fix: disable split chunks for umd and iife output format (#1378)

Author: Timeless0911

packages/core/src/config.ts

@@ -763,10 +763,7 @@ const composeFormatConfig = ({
             },
             optimization: {
               nodeEnv: process.env.NODE_ENV,
-              splitChunks: {
-                // sync chunk of umd can not be loaded without mounting on scripts
-                chunks: 'async',
-              },
+              splitChunks: false,
             },
             plugins,
           },
@@ -811,6 +808,7 @@ const composeFormatConfig = ({
             },
             optimization: {
               nodeEnv: process.env.NODE_ENV,
+              splitChunks: false,
             },
             plugins,
           },

packages/core/tests/__snapshots__/config.test.ts.snap

@@ -3066,9 +3066,7 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config i
   },
   optimization: {
     minimize: true,
-    splitChunks: {
-      chunks: 'async'
-    },
+    splitChunks: false,
     minimizer: [
       /* config.optimization.minimizer('js') */
       new SwcJsMinimizerRspackPlugin(
@@ -5118,9 +5116,7 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config i
           },
           "optimization": {
             "nodeEnv": undefined,
-            "splitChunks": {
-              "chunks": "async",
-            },
+            "splitChunks": false,
           },
           "output": {
             "asyncChunks": false,
@@ -5367,6 +5363,7 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config i
           },
           "optimization": {
             "nodeEnv": undefined,
+            "splitChunks": false,
           },
           "output": {
             "asyncChunks": false,