From 7c9237d15829a97190c6d4f19e597eedb7bfb0f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Thu, 16 Sep 2021 16:27:33 -0400
Subject: [PATCH] fix flow errors

---
 packages/babel-parser/src/parser/util.js     | 5 ++++-
 packages/babel-parser/src/tokenizer/types.js | 4 ++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/babel-parser/src/parser/util.js b/packages/babel-parser/src/parser/util.js
index e128a30acd87..0ff740686c4d 100644
--- a/packages/babel-parser/src/parser/util.js
+++ b/packages/babel-parser/src/parser/util.js
@@ -1,6 +1,7 @@
 // @flow
 
 import {
+  isTokenType,
   tokenIsKeyword,
   tokenLabelName,
   tt,
@@ -173,17 +174,19 @@ export default class UtilParser extends Tokenizer {
       template: "Unexpected token",
     },
   ): empty {
-    if (typeof messageOrType === "number") {
+    if (isTokenType(messageOrType)) {
       messageOrType = {
         code: ErrorCodes.SyntaxError,
         reasonCode: "UnexpectedToken",
         template: `Unexpected token, expected "${tokenLabelName(
+          // $FlowIgnore: Flow does not support assertion signature and TokenType is opaque
           messageOrType,
         )}"`,
       };
     }
 
     /* eslint-disable @babel/development-internal/dry-error-messages */
+    // $FlowIgnore: Flow does not support assertion signature and TokenType is opaque
     throw this.raise(pos != null ? pos : this.state.start, messageOrType);
     /* eslint-enable @babel/development-internal/dry-error-messages */
   }
diff --git a/packages/babel-parser/src/tokenizer/types.js b/packages/babel-parser/src/tokenizer/types.js
index 335e8bd53562..e58f2b7d5ca6 100644
--- a/packages/babel-parser/src/tokenizer/types.js
+++ b/packages/babel-parser/src/tokenizer/types.js
@@ -306,6 +306,10 @@ export function getExportedToken(token: TokenType): ExportedTokenType {
   return tokenTypes[token];
 }
 
+export function isTokenType(obj: any): boolean {
+  return typeof obj === "number";
+}
+
 if (!process.env.BABEL_8_BREAKING) {
   tokenTypes[tt.braceR].updateContext = context => {
     context.pop();