fix: accept both keep_fnames and keep_classnames in jsc minify options

crates/swc/src/config/issue-6996.json

@@ -0,0 +1,19 @@
+{
+    "test": ".jsx?$",
+    "jsc": {
+        "parser": {
+            "syntax": "ecmascript",
+            "jsx": true,
+            "decorators": true,
+            "dynamicImport": true
+        },
+        "transform": {
+            "react": {
+                "refresh": true
+            }
+        },
+        "minify": {
+            "keep_fnames": true
+        }
+    }
+}

crates/swc/src/config/mod.rs

@@ -920,10 +920,10 @@ pub struct JsMinifyOptions {
     #[serde(default)]
     pub ecma: TerserEcmaVersion,
 
-    #[serde(default)]
+    #[serde(default, alias = "keep_classnames")]
     pub keep_classnames: bool,
 
-    #[serde(default)]
+    #[serde(default, alias = "keep_fnames")]
     pub keep_fnames: bool,
 
     #[serde(default)]

crates/swc/src/config/tests.rs

@@ -26,3 +26,9 @@ fn jsonc() {
     let rc = parse_swcrc(include_str!("jsonc.json")).expect("failed to parse");
     dbg!(&rc);
 }
+
+#[test]
+fn issue_6996() {
+    let rc = parse_swcrc(include_str!("issue-6996.json")).expect("failed to parse");
+    dbg!(&rc);
+}

node-swc/__tests__/minify/issue_6996_test.mjs

@@ -0,0 +1,15 @@
+import swc from "../../..";
+
+it("should not throw when keep_fnames is on", async () => {
+    async function minify() {
+        const { code } = await swc.transform('function Foo() {}', {
+            jsc: {
+                minify: {
+                    keep_fnames: true,
+                },
+            },
+        });
+        return code;
+    }
+    await expect(minify()).resolves.toEqual('function Foo() {}\n');
+});