add check for master branch prerelease script (#400)

Co-authored-by: Alex Prokop <[email protected]>

Author: baseten

package.json

@@ -11,7 +11,7 @@
     "clean": "rimraf packages/*/dist packages/*/build",
     "lint": "eslint .",
     "prepare": "husky install",
-    "prerelease": "npm run lint && npm run test:force && npm run build:force",
+    "prerelease": "./scripts/checkReleaseBranch.mjs && npm run lint && npm run test:force && npm run build:force",
     "release": "lerna publish --no-private",
     "test": "nx run-many --target=test --all --parallel",
     "test:force": "nx run-many --target=test --all --parallel --skip-nx-cache",

scripts/checkReleaseBranch.mjs

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+import process from 'node:process';
+import { execSync } from 'child_process';
+
+const RELEASE_BRANCH = 'master';
+const CONSOLE_COLOR_RED = '\x1b[31m';
+const CONSOLE_COLOR_RESET = '\x1b[0m';
+
+const status = execSync('git status', { encoding: 'utf-8' });
+
+const res = status.match(/on branch (.+)\n/i);
+const currentBranch = res?.[1];
+
+if (currentBranch !== RELEASE_BRANCH)
+{
+    const messageParts = [
+        CONSOLE_COLOR_RED,
+        `You are on the "${currentBranch}" branch and not the release branch: "${RELEASE_BRANCH}"!`,
+        CONSOLE_COLOR_RESET,
+    ];
+
+    console.error(messageParts.join(''));
+    process.exit(1);
+}
+
+process.exit(0);