feat: extract sequence from for-of

apps/docs/src/concepts/unminify.md

@@ -170,6 +170,12 @@ a = 1; // [!code ++]
 for (let key in object) {} // [!code ++]
 ```
 
+```js
+for (let value of (a = 1, array)) {} // [!code --]
+a = 1; // [!code ++]
+for (let value of array) {} // [!code ++]
+```
+
 ```js
 for((a(), b());;) {} // [!code --]
 a(); // [!code ++]

packages/webcrack/src/unminify/test/sequence.test.ts

@@ -59,6 +59,14 @@ test('rearrange from for-in', () =>
     for (let key in object) {}
   `));
 
+test('rearrange from for-of', () =>
+  expectJS(`
+    for (let value of (a = 1, array)) {}
+  `).toMatchInlineSnapshot(`
+    a = 1;
+    for (let value of array) {}
+  `));
+
 test('rearrange from for loop init', () => {
   expectJS(`
     for((a(), b());;);

packages/webcrack/src/unminify/transforms/sequence.ts

@@ -105,11 +105,20 @@ export default {
       },
       ForInStatement: {
         exit(path) {
-          const sequence = m.capture(m.sequenceExpression());
-          const matcher = m.forInStatement(m.anything(), sequence);
-          if (!matcher.match(path.node)) return;
+          if (!t.isSequenceExpression(path.node.right)) return;
 
-          const { expressions } = sequence.current!;
+          const { expressions } = path.node.right;
+          path.node.right = expressions.pop()!;
+          const statements = expressions.map(t.expressionStatement);
+          path.insertBefore(statements);
+          this.changes++;
+        },
+      },
+      ForOfStatement: {
+        exit(path) {
+          if (!t.isSequenceExpression(path.node.right)) return;
+
+          const { expressions } = path.node.right;
           path.node.right = expressions.pop()!;
           const statements = expressions.map(t.expressionStatement);
           path.insertBefore(statements);