Prepare relay for prettier v3

Reviewed By: pieterv

Differential Revision: D78686859

fbshipit-source-id: 88daa2d20abcce4721d689a661d68c4448bbd195

Author: SamChou19815

.prettierrc.js

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @oncall relay
+ */
+
+module.exports = {
+  arrowParens: 'avoid',
+  bracketSameLine: true,
+  bracketSpacing: false,
+  requirePragma: true,
+  singleQuote: true,
+  trailingComma: 'all',
+  parser: 'hermes',
+  plugins: [
+    // Using module.parent and createRequire hack to simulate prettier v2 plugin resolution behavior.
+    // The hack allows us to resolve the plugin from the install location of prettier.
+    (module.parent
+      ? require('module').createRequire(module.parent.id)
+      : require
+    ).resolve('prettier-plugin-hermes-parser'),
+  ],
+};

package.json

@@ -88,15 +88,6 @@
     "node": ">=18.x",
     "npm": ">=8.x"
   },
-  "prettier": {
-    "arrowParens": "avoid",
-    "bracketSameLine": true,
-    "bracketSpacing": false,
-    "requirePragma": true,
-    "singleQuote": true,
-    "trailingComma": "all",
-    "parser": "hermes"
-  },
   "jest": {
     "testMatch": [
       "<rootDir>/packages/**/__tests__/**/*-test.js"