From c0e6d2887f6883f090831fb49293ed9c2b33f2e0 Mon Sep 17 00:00:00 2001
From: George Zahariev <gkz@meta.com>
Date: Thu, 15 Feb 2024 07:00:10 -0800
Subject: [PATCH] Update xplat/js/tools/metro Babel config to use
 `babel-plugin-syntax-hermes-parser`

Summary:
`babel-plugin-syntax-hermes-parser` allows us to use the latest Flow syntax.

After changes to the plugin SamZ made for version 0.18.1, it only applies to Flow files (leaving TS files to be parsed by Babel): https://github.com/facebook/hermes/blob/main/tools/hermes-parser/js/CHANGELOG.md#0181

Reviewed By: robhogan

Differential Revision: D53597388

fbshipit-source-id: 461627483a6726377fbdc7a452afb808d1479b75
---
 babel.config.js | 1 +
 package.json    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/babel.config.js b/babel.config.js
index 5f643cfd7e..ee5229b0c2 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -19,6 +19,7 @@ const fs = require('fs');
 import type {BabelCoreOptions} from '@babel/core';
 */
 const plugins = [
+  'babel-plugin-syntax-hermes-parser',
   '@babel/plugin-transform-flow-strip-types',
   '@babel/plugin-transform-modules-commonjs',
   '@babel/plugin-syntax-class-properties',
diff --git a/package.json b/package.json
index b93ea6c87a..59453cedb7 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "@typescript-eslint/parser": "^6.7.4",
     "acorn": "^8.7.1",
     "babel-jest": "^29.6.3",
+    "babel-plugin-syntax-hermes-parser": "0.19.1",
     "chalk": "^4.0.0",
     "debug": "^2.2.0",
     "eslint": "^8.23.1",