From 1c1b938356b8832b0255209ae30d0ffa62370308 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Sat, 6 Nov 2021 10:45:32 -0400
Subject: [PATCH] fix flow errors

---
 packages/babel-parser/src/parser/expression.js | 15 +++++++++------
 packages/babel-parser/src/parser/lval.js       |  2 ++
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
index 2ecaa67bf94d..1d771b8bd609 100644
--- a/packages/babel-parser/src/parser/expression.js
+++ b/packages/babel-parser/src/parser/expression.js
@@ -73,6 +73,7 @@ import { cloneIdentifier } from "./node";
 
 /*::
 import type { SourceType } from "../options";
+declare var invariant;
 */
 
 const invalidHackPipeBodies = new Map([
@@ -841,13 +842,14 @@ export default class ExpressionParser extends LValParser {
 
     let node = this.startNodeAt(startPos, startLoc);
     node.callee = base;
+    const { maybeAsyncArrow, optionalChainMember } = state;
 
-    if (state.maybeAsyncArrow) {
+    if (maybeAsyncArrow) {
       this.expressionScope.enter(newAsyncArrowScope());
       refExpressionErrors = new ExpressionErrors();
     }
 
-    if (state.optionalChainMember) {
+    if (optionalChainMember) {
       node.optional = optional;
     }
 
@@ -862,9 +864,10 @@ export default class ExpressionParser extends LValParser {
         refExpressionErrors,
       );
     }
-    this.finishCallExpression(node, state.optionalChainMember);
+    this.finishCallExpression(node, optionalChainMember);
 
-    if (state.maybeAsyncArrow && this.shouldParseAsyncArrow() && !optional) {
+    if (maybeAsyncArrow && this.shouldParseAsyncArrow() && !optional) {
+      /*:: invariant(refExpressionErrors != null) */
       state.stop = true;
       this.checkDestructuringPrivate(refExpressionErrors);
       this.expressionScope.validateAsPattern();
@@ -874,7 +877,7 @@ export default class ExpressionParser extends LValParser {
         node,
       );
     } else {
-      if (state.maybeAsyncArrow) {
+      if (maybeAsyncArrow) {
         this.checkExpressionErrors(refExpressionErrors, true);
         this.expressionScope.exit();
       }
@@ -2235,7 +2238,7 @@ export default class ExpressionParser extends LValParser {
           case tt.privateName: {
             // the class private key has been handled in parseClassElementName
             const privateKeyPos = this.state.start;
-            if (refExpressionErrors !== undefined) {
+            if (refExpressionErrors != null) {
               if (refExpressionErrors.privateKey === -1) {
                 refExpressionErrors.privateKey = privateKeyPos;
               }
diff --git a/packages/babel-parser/src/parser/lval.js b/packages/babel-parser/src/parser/lval.js
index 85eb5b2c48b8..200012247f54 100644
--- a/packages/babel-parser/src/parser/lval.js
+++ b/packages/babel-parser/src/parser/lval.js
@@ -16,6 +16,7 @@ import type {
   /*:: ObjectMember, */
   /*:: TsNamedTypeElementBase, */
   /*:: Identifier, */
+  /*:: PrivateName, */
   /*:: ObjectExpression, */
   /*:: ObjectPattern, */
 } from "../types";
@@ -63,6 +64,7 @@ export default class LValParser extends NodeUtils {
   +parsePropertyName: (
     prop: ObjectOrClassMember | ClassMember | TsNamedTypeElementBase,
   ) => Expression | Identifier;
+  +parsePrivateName: () => PrivateName
   */
   // Forward-declaration: defined in statement.js
   /*::