fix: ExpressionBody should respect [In] parameter

babel · Aug 7, 2020 · 7a41d58 · 7a41d58
1 parent 8ecfb78
commit 7a41d58
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Showing 3 changed files with 6 additions and 1 deletion.
diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
@@ -2110,7 +2110,8 @@ export default class ExpressionParser extends LValParser {
     this.state.inParameters = false;
 
     if (isExpression) {
-      node.body = this.parseMaybeAssignAllowIn();
+      // https://tc39.es/ecma262/#prod-ExpressionBody
+      node.body = this.parseMaybeAssign();
       this.checkParams(node, false, allowExpression, false);
     } else {
       const oldStrict = this.state.strict;

diff --git a/packages/babel-parser/test/fixtures/es2015/arrow-functions/no-for-in-init/input.js b/packages/babel-parser/test/fixtures/es2015/arrow-functions/no-for-in-init/input.js
@@ -0,0 +1 @@
+for (() => x in y;;);
diff --git a/packages/babel-parser/test/fixtures/es2015/arrow-functions/no-for-in-init/options.json b/packages/babel-parser/test/fixtures/es2015/arrow-functions/no-for-in-init/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \")\" (1:17)"
+}