feat(es/transforms): Expose tsEnumIsMutable to JS (#10716)

Author: ahabhgk

.changeset/rich-phones-explode.md

@@ -0,0 +1,6 @@
+---
+swc_core: patch
+swc: patch
+---
+
+feat: expose tsEnumIsMutable to js API

crates/swc/src/config/mod.rs

@@ -526,6 +526,7 @@ impl Options {
         };
 
         let verbatim_module_syntax = transform.verbatim_module_syntax.into_bool();
+        let ts_enum_is_mutable = transform.ts_enum_is_mutable.into_bool();
 
         let charset = cfg.jsc.output.charset.or_else(|| {
             if js_minify.as_ref()?.format.ascii_only {
@@ -777,6 +778,7 @@ impl Options {
                             import_export_assign_config,
                             verbatim_module_syntax,
                             native_class_properties,
+                            ts_enum_is_mutable,
                             ..Default::default()
                         };
 
@@ -1557,6 +1559,9 @@ pub struct TransformConfig {
 
     #[serde(default)]
     pub decorator_version: Option<DecoratorVersion>,
+
+    #[serde(default)]
+    pub ts_enum_is_mutable: BoolConfig<false>,
 }
 
 #[derive(Debug, Default, Clone, Serialize, Deserialize, Merge)]

crates/swc/tests/fixture/ts-inline-enum/mutable-enum/input/.swcrc

@@ -0,0 +1,10 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript"
+        },
+        "transform": {
+            "tsEnumIsMutable": true
+        }
+    }
+}

crates/swc/tests/fixture/ts-inline-enum/mutable-enum/input/index.ts

@@ -0,0 +1,7 @@
+enum Foo {
+    hello = 42,
+}
+
+Foo.hello = 0;
+
+console.log(Foo.hello);

crates/swc/tests/fixture/ts-inline-enum/mutable-enum/output/index.ts

@@ -0,0 +1,6 @@
+var Foo = /*#__PURE__*/ function(Foo) {
+    Foo[Foo["hello"] = 42] = "hello";
+    return Foo;
+}(Foo || {});
+Foo.hello = 0;
+console.log(Foo.hello);

packages/types/index.ts

@@ -879,6 +879,7 @@ export interface TransformConfig {
      */
     verbatimModuleSyntax?: boolean;
 
+    tsEnumIsMutable?: boolean;
 }
 
 export interface ReactConfig {