Test Update and Unary expressions

packages/babel-plugin-transform-optional-chaining/src/index.js

@@ -92,7 +92,10 @@ export default function ({ types: t }) {
           if (path.key == "callee" && (parentPath.isCallExpression() || parentPath.isNewExpression())) {
             return false;
           }
-          if (path.key == "argument" && parentPath.isUnaryExpression()) {
+          if (path.key == "argument" && parentPath.isUpdateExpression()) {
+            return false;
+          }
+          if (path.key == "argument" && parentPath.isUnaryExpression({ operator: "delete" })) {
             return false;
           }
 

packages/babel-plugin-transform-optional-chaining/test/fixtures/execute/unary.js

@@ -0,0 +1,17 @@
+const obj = {
+  a: {
+    b: 0,
+  },
+};
+
+let test = +obj?.a?.b;
+assert.equal(test, 0);
+
+test = +obj?.a.b;
+assert.equal(test, 0);
+
+test = +obj?.b?.b;
+assert.isNaN(test);
+
+test = +obj?.b?.b;
+assert.isNaN(test);

packages/babel-plugin-transform-optional-chaining/test/fixtures/execute/update.js

@@ -0,0 +1,14 @@
+const obj = {
+  a: {
+    b: 0,
+  },
+};
+
+obj?.a.b++;
+assert.equal(obj.a.b, 1);
+
+obj?.a?.b++;
+assert.equal(obj.a.b, 2);
+
+obj?.b?.b++;
+assert.equal(obj.b, undefined);