diff --git a/crates/mako/src/chunk_pot/util.rs b/crates/mako/src/chunk_pot/util.rs
index 14a00099a..5ea1fc1c4 100644
--- a/crates/mako/src/chunk_pot/util.rs
+++ b/crates/mako/src/chunk_pot/util.rs
@@ -92,11 +92,7 @@ pub(crate) fn empty_module_fn_expr() -> FnExpr {
     create = "{ SizedCache::with_size(5) }"
 )]
 pub(crate) fn runtime_code(context: &Arc<Context>) -> Result<String> {
-    let umd = if context.config.umd != "none" {
-        Some(context.config.umd.clone())
-    } else {
-        None
-    };
+    let umd = context.config.umd.clone();
     let chunk_graph = context.chunk_graph.read().unwrap();
     let has_dynamic_chunks = chunk_graph.get_all_chunks().len() > 1;
     let has_hmr = context.args.watch;
diff --git a/crates/mako/src/config.rs b/crates/mako/src/config.rs
index ca9367dcb..601e7a17b 100644
--- a/crates/mako/src/config.rs
+++ b/crates/mako/src/config.rs
@@ -287,7 +287,7 @@ pub struct Config {
     #[serde(rename = "ignoreCSSParserErrors")]
     pub ignore_css_parser_errors: bool,
     pub dynamic_import_to_require: bool,
-    pub umd: String,
+    pub umd: Option<String>,
     pub write_to_disk: bool,
     pub transform_import: Vec<TransformImportConfig>,
     pub dev_eval: bool,
@@ -440,7 +440,6 @@ const DEFAULT_CONFIG: &str = r#"
     "autoCSSModules": false,
     "ignoreCSSParserErrors": false,
     "dynamicImportToRequire": false,
-    "umd": "none",
     "writeToDisk": true,
     "transformImport": [],
     "devEval": false,
@@ -631,10 +630,8 @@ impl Default for Config {
     }
 }
 
-fn get_default_chunk_loading_global(umd: String, root: &Path) -> String {
-    let unique_name = if umd != "none" {
-        umd
-    } else {
+fn get_default_chunk_loading_global(umd: Option<String>, root: &Path) -> String {
+    let unique_name = umd.unwrap_or_else(|| {
         let pkg_json_path = root.join("package.json");
         let mut pkg_name = "global".to_string();
 
@@ -648,7 +645,7 @@ fn get_default_chunk_loading_global(umd: String, root: &Path) -> String {
         }
 
         pkg_name
-    };
+    });
 
     format!("makoChunk_{}", unique_name)
 }
diff --git a/docs/config.md b/docs/config.md
index 570455cc5..72ddb5e0d 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -358,12 +358,12 @@ publicPath 配置。注：有个特殊值 `"runtime"`，表示会切换到 runti
 
 ## umd
 
-- 类型：`"none" | string`
-- 默认值：`"none"`
+- 类型：`null | string`
+- 默认值：`null`
 
 是否输出 umd 格式的代码。
 
-注：1）后续会改成 `Object` 类型，支持更多子配置用于控制 umd 参数；2）`"none"` 会改成 `false` 类型。
+注：后续会改成 `Object` 类型，支持更多子配置用于控制 umd 参数。
 
 ## writeToDisk