From 440cebc19d9dcbeba6efc43259871f58d1fc9a97 Mon Sep 17 00:00:00 2001
From: "Michael B. Gale" <mbg@github.com>
Date: Tue, 14 Jul 2026 11:14:59 +0100
Subject: [PATCH] Add `getCurrentVersion`

---
 pr-checks/config.ts                |  3 +++
 pr-checks/update-release-branch.ts | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/pr-checks/config.ts b/pr-checks/config.ts
index 75cd0a151..9458ef780 100644
--- a/pr-checks/config.ts
+++ b/pr-checks/config.ts
@@ -12,6 +12,9 @@ export const REPO_ROOT = path.join(PR_CHECKS_DIR, "..");
 /** The path of the file configuring which checks shouldn't be required. */
 export const PR_CHECK_EXCLUDED_FILE = path.join(PR_CHECKS_DIR, "excluded.yml");
 
+/** The path of the main `package.json`. */
+export const PACKAGE_JSON = path.join(REPO_ROOT, "package.json");
+
 /** The path to the esbuild metadata file. */
 export const BUNDLE_METADATA_FILE = path.join(REPO_ROOT, "meta.json");
 
diff --git a/pr-checks/update-release-branch.ts b/pr-checks/update-release-branch.ts
index 00c7c4f72..dcfec68bc 100755
--- a/pr-checks/update-release-branch.ts
+++ b/pr-checks/update-release-branch.ts
@@ -1,7 +1,10 @@
 #!/usr/bin/env npx tsx
 
+import * as fs from "node:fs";
 import { parseArgs } from "node:util";
 
+import { PACKAGE_JSON } from "./config";
+
 /** Placeholder changelog content for a new release. */
 const EMPTY_CHANGELOG = `# CodeQL Action Changelog
 
@@ -46,6 +49,14 @@ export function getGitHubToken(): string {
   throw new Error("Missing GitHub token. Set GITHUB_TOKEN or GH_TOKEN.");
 }
 
+/** Reads the current version from `package.json`. */
+export function getCurrentVersion(): string | undefined {
+  const pkg: { version: string } = JSON.parse(
+    fs.readFileSync(PACKAGE_JSON, "utf8"),
+  );
+  return pkg.version;
+}
+
 interface MainOptions {
   repositoryNwo: string;
   sourceBranch: string;
@@ -102,6 +113,15 @@ async function main(): Promise<void> {
     RELEASE_BRANCH_PREFIX,
     "",
   );
+
+  const currentVersion = getCurrentVersion();
+
+  if (!currentVersion) {
+    throw new Error("Failed to read current version from package.json");
+  }
+
+  const [, vMinor, vPatch] = currentVersion.split(".");
+  const version = `${targetBranchMajorVersion}.${vMinor}.${vPatch}`;
 }
 
 // Only call `main` if this script was run directly.