@@ -15,6 +15,7 @@ pub struct BindingExperimentalOptions {
   pub transform_hires_sourcemap: Option<Either<bool, String>>,
   pub native_magic_string: Option<bool>,
   pub chunk_optimization: Option<bool>,
+  pub lazy_barrel: Option<bool>,
 }
 
 impl TryFrom<BindingExperimentalOptions> for rolldown_common::ExperimentalOptions {
@@ -52,6 +53,7 @@ impl TryFrom<BindingExperimentalOptions> for rolldown_common::ExperimentalOption
       },
       native_magic_string: value.native_magic_string,
       chunk_optimization: value.chunk_optimization,
+      lazy_barrel: value.lazy_barrel,
     })
   }
 }
 
@@ -3,9 +3,8 @@ use schemars::JsonSchema;
 #[cfg(feature = "deserialize_bundler_options")]
 use serde::Deserialize;
 
-use crate::inner_bundler_options::types::chunk_import_map::ChunkImportMap;
-
 use super::attach_debug_info::AttachDebugInfo;
+use super::chunk_import_map::ChunkImportMap;
 use super::chunk_modules_order::ChunkModulesOrderBy;
 use super::dev_mode_options::DevModeOptions;
 
@@ -51,6 +50,7 @@ pub struct ExperimentalOptions {
   pub transform_hires_sourcemap: Option<SourcemapHires>,
   pub native_magic_string: Option<bool>,
   pub chunk_optimization: Option<bool>,
+  pub lazy_barrel: Option<bool>,
 }
 
 impl ExperimentalOptions {
@@ -82,4 +82,8 @@ impl ExperimentalOptions {
   pub fn is_chunk_optimization_enabled(&self) -> bool {
     self.chunk_optimization.unwrap_or(true)
   }
+
+  pub fn is_lazy_barrel_enabled(&self) -> bool {
+    self.lazy_barrel.unwrap_or(false)
+  }
 }
@@ -1036,6 +1036,12 @@
             "boolean",
             "null"
           ]
+        },
+        "lazyBarrel": {
+          "type": [
+            "boolean",
+            "null"
+          ]
         }
       },
       "additionalProperties": false
 
@@ -1861,6 +1861,7 @@ export interface BindingExperimentalOptions {
   transformHiresSourcemap?: boolean | 'boundary'
   nativeMagicString?: boolean
   chunkOptimization?: boolean
+  lazyBarrel?: boolean
 }
 
 export interface BindingFilterToken {
 
@@ -614,6 +614,12 @@ export interface InputOptions {
      * @default true
      */
     chunkOptimization?: boolean;
+    /**
+     * Control whether to enable lazy barrel optimization.
+     *
+     * @default false
+     */
+    lazyBarrel?: boolean;
   };
   /**
    * Configure how the code is transformed. This process happens after the `transform` hook.
 
@@ -180,6 +180,7 @@ function bindingifyExperimental(
     incrementalBuild: experimental?.incrementalBuild,
     nativeMagicString: experimental?.nativeMagicString,
     chunkOptimization: experimental?.chunkOptimization,
+    lazyBarrel: experimental?.lazyBarrel,
   };
 }
 
 
@@ -489,6 +489,7 @@ const InputOptionsSchema = v.strictObject({
       ),
       nativeMagicString: v.optional(v.boolean()),
       chunkOptimization: v.optional(v.boolean()),
+      lazyBarrel: v.optional(v.boolean()),
     }),
   ),
   transform: v.optional(TransformOptionsSchema),
Original file line number	Diff line number	Diff line change
`@@ -15,6 +15,7 @@ pub struct BindingExperimentalOptions {`
`15`	`15`	`pub transform_hires_sourcemap: Option<Either<bool, String>>,`
`16`	`16`	`pub native_magic_string: Option<bool>,`
`17`	`17`	`pub chunk_optimization: Option<bool>,`
	`18`	`+ pub lazy_barrel: Option<bool>,`
`18`	`19`	`}`
`19`	`20`
`20`	`21`	`impl TryFrom<BindingExperimentalOptions> for rolldown_common::ExperimentalOptions {`
`@@ -52,6 +53,7 @@ impl TryFrom<BindingExperimentalOptions> for rolldown_common::ExperimentalOption`
`52`	`53`	`},`
`53`	`54`	`native_magic_string: value.native_magic_string,`
`54`	`55`	`chunk_optimization: value.chunk_optimization,`
	`56`	`+ lazy_barrel: value.lazy_barrel,`
`55`	`57`	`})`
`56`	`58`	`}`
`57`	`59`	`}`
Original file line number	Diff line number	Diff line change
`@@ -1036,6 +1036,12 @@`
`1036`	`1036`	`"boolean",`
`1037`	`1037`	`"null"`
`1038`	`1038`	`]`
	`1039`	`+ },`
	`1040`	`+ "lazyBarrel": {`
	`1041`	`+ "type": [`
	`1042`	`+ "boolean",`
	`1043`	`+ "null"`
	`1044`	`+ ]`
`1039`	`1045`	`}`
`1040`	`1046`	`},`
`1041`	`1047`	`"additionalProperties": false`
Original file line number	Diff line number	Diff line change
`@@ -1861,6 +1861,7 @@ export interface BindingExperimentalOptions {`
`1861`	`1861`	`transformHiresSourcemap?: boolean \| 'boundary'`
`1862`	`1862`	`nativeMagicString?: boolean`
`1863`	`1863`	`chunkOptimization?: boolean`
	`1864`	`+ lazyBarrel?: boolean`
`1864`	`1865`	`}`
`1865`	`1866`
`1866`	`1867`	`export interface BindingFilterToken {`
Original file line number	Diff line number	Diff line change
`@@ -180,6 +180,7 @@ function bindingifyExperimental(`
`180`	`180`	`incrementalBuild: experimental?.incrementalBuild,`
`181`	`181`	`nativeMagicString: experimental?.nativeMagicString,`
`182`	`182`	`chunkOptimization: experimental?.chunkOptimization,`
	`183`	`+ lazyBarrel: experimental?.lazyBarrel,`
`183`	`184`	`};`
`184`	`185`	`}`
`185`	`186`