Allow await when it is not in AsyncArrowHead (#11148)

2020-03-16 16:26:48 -05:00
parent 1ba41f2084
commit 84a9ea455b
4 changed files with 122 additions and 1 deletions
--- a/packages/babel-parser/src/tokenizer/state.js
+++ b/packages/babel-parser/src/tokenizer/state.js
@@ -59,6 +59,11 @@ export default class State {
  // Flags to track
  inParameters: boolean = false;
  maybeInArrowParameters: boolean = false;
+  // This flag is used to track async arrow head across function declarations.
+  // e.g. async (foo = function (await) {}) => {}
+  // When parsing `await` in this expression, `maybeInAsyncArrowHead` is true
+  // but `maybeInArrowParameters` is false
+  maybeInAsyncArrowHead: boolean = false;
  inPipeline: boolean = false;
  inType: boolean = false;
  noAnonFunctionType: boolean = false;