fix(es/transforms/compat): Fix new_target (#2736)

crates/swc_ecma_transforms_compat/src/es2015/new_target.rs

@@ -85,6 +85,8 @@ impl VisitMut for NewTarget {
         let old = self.in_constructor;
 
         self.in_constructor = true;
+        self.in_arrow_expr = false;
+        self.var = None;
 
         c.visit_mut_children_with(self);
 

crates/swc_ecma_transforms_compat/tests/fixture/new-target/exec/block/exec.js

@@ -0,0 +1,22 @@
+const targets = [];
+
+{
+  function foo() {
+    targets.push(new.target);
+  }
+  foo();
+}
+
+expect(targets[0]).toBeUndefined();
+
+{
+  class Foo {
+    constructor() {
+      targets.push(new.target);
+    }
+  }
+
+  new Foo();
+}
+
+expect(targets[1]).not.toBeUndefined();

crates/swc_ecma_transforms_compat/tests/fixture/new-target/general/block/input.js

@@ -0,0 +1,11 @@
+{
+  class Foo {
+    constructor() {
+      new.target;
+    }
+
+    test() {
+      new.target;
+    }
+  }
+}

crates/swc_ecma_transforms_compat/tests/fixture/new-target/general/block/output.js

@@ -0,0 +1,10 @@
+{
+  class Foo {
+    constructor() {
+      this.constructor;
+    }
+    test() {
+      void 0;
+    }
+  }
+}

crates/swc_ecma_transforms_compat/tests/fixture/new-target/general/iiaf-class/input.js

@@ -0,0 +1,11 @@
+(() => {
+  class Foo {
+    constructor() {
+      new.target;
+    }
+
+    test() {
+      new.target;
+    }
+  }
+})()

crates/swc_ecma_transforms_compat/tests/fixture/new-target/general/iiaf-class/output.js

@@ -0,0 +1,10 @@
+(() => {
+  class Foo {
+    constructor() {
+      this.constructor;
+    }
+    test() {
+      void 0;
+    }
+  }
+})()