mangle fns

packages/babel-helpers/scripts/generate-helpers.js

@@ -51,6 +51,9 @@ export default Object.freeze({
     }
     const { minVersion } = minVersionMatch.groups;
 
+    const mangleFns = code.includes("@mangleFns");
+    const noMangleFns = [];
+
     code = transformSync(code, {
       configFile: false,
       babelrc: false,
@@ -76,14 +79,27 @@ export default Object.freeze({
                 .replace(/\.ts$/, "")
                 .replace(/^\.\//, "");
             },
+            FunctionDeclaration(path) {
+              if (
+                mangleFns &&
+                path.node.leadingComments?.find(c =>
+                  c.value.includes("@no-mangle")
+                )
+              ) {
+                const name = path.node.id.name;
+                if (name) noMangleFns.push(name);
+              }
+            },
           },
         },
       ],
     }).code;
-
     code = (
       await minify(code, {
-        mangle: { keep_fnames: true },
+        mangle: {
+          toplevel: true,
+          keep_fnames: mangleFns ? new RegExp(noMangleFns.join("|")) : true,
+        },
         // The _typeof helper has a custom directive that we must keep
         compress: { directives: false },
       })

packages/babel-plugin-transform-class-properties/test/fixtures/public-loose/class-shadow-builtins/output.mjs

@@ -1,5 +1,5 @@
 function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : String(i); }
+function _toPropertyKey(r) { var o = _toPrimitive(r, "string"); return "symbol" == typeof o ? o : String(o); }
 function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 class _TypeError {
   constructor() {

packages/babel-plugin-transform-class-properties/test/fixtures/public/class-shadow-builtins/output.mjs

@@ -1,5 +1,5 @@
 function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : String(i); }
+function _toPropertyKey(r) { var o = _toPrimitive(r, "string"); return "symbol" == typeof o ? o : String(o); }
 function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 class _TypeError {
   constructor() {

packages/babel-plugin-transform-class-static-block/test/plugin-ordering.test.js

@@ -22,7 +22,7 @@ describe("plugin ordering", () => {
     ).toMatchInlineSnapshot(`
       "var _class;
       function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-      function _toPropertyKey(t) { var i = _toPrimitive(t, \\"string\\"); return \\"symbol\\" == typeof i ? i : String(i); }
+      function _toPropertyKey(r) { var o = _toPrimitive(r, \\"string\\"); return \\"symbol\\" == typeof o ? o : String(o); }
       function _toPrimitive(t, r) { if (\\"object\\" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || \\"default\\"); if (\\"object\\" != typeof i) return i; throw new TypeError(\\"@@toPrimitive must return a primitive value.\\"); } return (\\"string\\" === r ? String : Number)(t); }
       class Foo {}
       _class = Foo;