Add script for bumping Hermes version for a release

Summary:
React Native releases that bundle the Hermes source code will have a `sdks/.hermesversion` file which indicates the specific git tag used when pulling the Hermes source code.

This script provides a method for release coordinators to specify which Hermes tag will be used in a given release. The Hermes tag should already exist on the `facebook/hermes` repository on GitHub, although this script makes no determination as to its validity.

# Changelog

[Internal] Added new script for release coordinators

Reviewed By: cortinico

Differential Revision: D34460693

fbshipit-source-id: b2f882ba66d925034c3803aafe81de5204d9e33f

scripts/bump-hermes-version.js

@@ -0,0 +1,76 @@
+#!/usr/bin/env node
+/**
+ * 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
+ */
+
+'use strict';
+
+/**
+ * This script walks a releaser through bumping the Hermes version for a release.
+ */
+const {exit} = require('shelljs');
+const yargs = require('yargs');
+const inquirer = require('inquirer');
+const fs = require('fs');
+const path = require('path');
+
+const HERMES_TAG_FILE_DIR = 'sdks';
+const HERMES_TAG_FILE_PATH = `${HERMES_TAG_FILE_DIR}/.hermesversion`;
+
+let argv = yargs.option('t', {
+  alias: 'tag',
+  describe:
+    'Hermes release tag to use for this React Native release, ex. hermes-2022-02-21-RNv0.68.0',
+  required: true,
+}).argv;
+
+function readHermesTag() {
+  if (fs.existsSync(path)) {
+    const data = fs.readFileSync(HERMES_TAG_FILE_PATH, {
+      encoding: 'utf8',
+      flag: 'r',
+    });
+    return data.trim();
+  } else {
+    return '';
+  }
+}
+
+function setHermesTag(hermesTag) {
+  if (readHermesTag() === hermesTag) {
+    // No need to update.
+    return;
+  }
+
+  if (!fs.existsSync(HERMES_TAG_FILE_DIR)) {
+    fs.mkdirSync(HERMES_TAG_FILE_DIR, {recursive: true});
+  }
+
+  fs.writeFileSync(HERMES_TAG_FILE_PATH, hermesTag.trim());
+  console.log('Hermes tag has been updated. Please commit your changes.');
+}
+
+async function main() {
+  const hermesTag = argv.tag;
+  const {confirmHermesTag} = await inquirer.prompt({
+    type: 'confirm',
+    name: 'confirmHermesTag',
+    message: `Do you want to use the Hermes release tagged "${hermesTag}"?`,
+  });
+
+  if (!confirmHermesTag) {
+    console.log('Aborting.');
+    return;
+  }
+
+  setHermesTag(hermesTag);
+}
+
+main().then(() => {
+  exit(0);
+});