fix: corrects handling of newline after async with paren-less arrow function (#8830)

If async is followed by a newline, then a paren-less arrow function should be parsed as two expressions
2018-10-09 17:25:31 -04:00
parent 3951acbff5
commit d2c75c2d38
3 changed files with 144 additions and 1 deletions
--- a/packages/babel-parser/src/parser/expression.js
+++ b/packages/babel-parser/src/parser/expression.js
@@ -794,7 +794,12 @@ export default class ExpressionParser extends LValParser {
        ) {
          this.next();
          return this.parseFunction(node, false, false, true);
-        } else if (canBeArrow && id.name === "async" && this.match(tt.name)) {
+        } else if (
+          canBeArrow &&
+          !this.canInsertSemicolon() &&
+          id.name === "async" &&
+          this.match(tt.name)
+        ) {
          const oldYield = this.state.yieldInPossibleArrowParameters;
          this.state.yieldInPossibleArrowParameters = null;
          const params = [this.parseIdentifier()];