fix: Compile re-declare var in init and body of for await

packages/babel-plugin-proposal-async-generator-functions/src/index.ts

@@ -54,11 +54,13 @@ export default declare(api => {
         // add the value declaration to the new loop body
         if (declar) {
           block.body.push(declar);
+          if (path.node.body.body.length) {
+            block.body.push(t.blockStatement(path.node.body.body));
+          }
+        } else {
+          block.body.push(...path.node.body.body);
         }
 
-        // push the rest of the original loop body onto our new body
-        block.body.push(...path.node.body.body);
-
         t.inherits(loop, node);
         t.inherits(loop.body, node.body);
 

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/async-arrow/output.js

@@ -5,7 +5,9 @@
   try {
     for (var _iterator = babelHelpers.asyncIterator(y), _step; _iteratorAbruptCompletion = !(_step = yield _iterator.next()).done; _iteratorAbruptCompletion = false) {
       let x = _step.value;
-      f(x);
+      {
+        f(x);
+      }
     }
   } catch (err) {
     _didIteratorError = true;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/async-function/output.js

@@ -9,7 +9,9 @@ function _f() {
     try {
       for (var _iterator = babelHelpers.asyncIterator(y), _step; _iteratorAbruptCompletion = !(_step = yield _iterator.next()).done; _iteratorAbruptCompletion = false) {
         let x = _step.value;
-        g(x);
+        {
+          g(x);
+        }
       }
     } catch (err) {
       _didIteratorError = true;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/async-generator/output.js

@@ -9,7 +9,9 @@ function _g() {
     try {
       for (var _iterator = babelHelpers.asyncIterator(y), _step; _iteratorAbruptCompletion = !(_step = yield babelHelpers.awaitAsyncGenerator(_iterator.next())).done; _iteratorAbruptCompletion = false) {
         let x = _step.value;
-        f(x);
+        {
+          f(x);
+        }
       }
     } catch (err) {
       _didIteratorError = true;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/create-async-from-sync-iterator/output.js

@@ -9,9 +9,11 @@ function _fn() {
     try {
       for (var _iterator = babelHelpers.asyncIterator([Promise.resolve("ok")]), _step; _iteratorAbruptCompletion = !(_step = yield babelHelpers.awaitAsyncGenerator(_iterator.next())).done; _iteratorAbruptCompletion = false) {
         const result = _step.value;
-        return {
-          result
-        };
+        {
+          return {
+            result
+          };
+        }
       }
     } catch (err) {
       _didIteratorError = true;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/destructuring/output.js

@@ -12,7 +12,9 @@ function _f() {
           x,
           y: [z]
         } = _step.value;
-        g(x, z);
+        {
+          g(x, z);
+        }
       }
     } catch (err) {
       _didIteratorError = true;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/re-declare-var-in-init-body/exec.js

@@ -0,0 +1,3 @@
+( async () => {
+  for await ( let x of [ ] ) { let x; }
+} ) ;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/re-declare-var-in-init-body/input.js

@@ -0,0 +1,3 @@
+( async () => {
+  for await ( let x of [ ] ) { let x; }
+} ) ;

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/for-await/re-declare-var-in-init-body/output.js

@@ -0,0 +1,26 @@
+/*#__PURE__*/babelHelpers.asyncToGenerator(function* () {
+  var _iteratorAbruptCompletion = false;
+  var _didIteratorError = false;
+  var _iteratorError;
+  try {
+    for (var _iterator = babelHelpers.asyncIterator([]), _step; _iteratorAbruptCompletion = !(_step = yield _iterator.next()).done; _iteratorAbruptCompletion = false) {
+      let x = _step.value;
+      {
+        let x;
+      }
+    }
+  } catch (err) {
+    _didIteratorError = true;
+    _iteratorError = err;
+  } finally {
+    try {
+      if (_iteratorAbruptCompletion && _iterator.return != null) {
+        yield _iterator.return();
+      }
+    } finally {
+      if (_didIteratorError) {
+        throw _iteratorError;
+      }
+    }
+  }
+});