Chore/changelog automation

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@headsdown/sdk",
-  "version": "0.2.13",
+  "version": "0.2.14",
   "description": "TypeScript client SDK for the HeadsDown availability API",
   "type": "module",
   "main": "./dist/index.js",
@@ -27,6 +27,8 @@
     "schema:sync": "node scripts/schema-sync.mjs",
     "codegen:types": "node scripts/codegen-types.mjs",
     "codegen": "npm run codegen:types",
+    "preversion": "git diff --exit-code CHANGELOG.md && (echo 'Error: Update CHANGELOG.md before bumping version' && exit 1) || exit 0",
+    "version": "node scripts/update-changelog.mjs && git add CHANGELOG.md",
     "prepare": "npm run build",
     "prepublishOnly": "npm run build",
     "clean": "rm -rf dist"

scripts/update-changelog.mjs

@@ -0,0 +1,24 @@
+import fs from "node:fs";
+import { execSync } from "node:child_process";
+
+const pkg = JSON.parse(fs.readFileSync("./package.json", "utf8"));
+const version = pkg.version;
+const changelogPath = "./CHANGELOG.md";
+
+let changelog = fs.readFileSync(changelogPath, "utf8");
+
+// Check if version already exists in changelog to avoid duplicates
+if (changelog.includes(`## ${version}`)) {
+  process.exit(0);
+}
+
+// Insert the new version header after the main title
+const titleLine = "# Changelog\n";
+if (changelog.startsWith(titleLine)) {
+  const newContent = `${titleLine}\n## ${version}\n\n- (Add changes here)\n${changelog.slice(titleLine.length)}`;
+  fs.writeFileSync(changelogPath, newContent);
+  console.log(`Updated ${changelogPath} with version ${version}`);
+} else {
+  console.error('CHANGELOG.md does not start with "# Changelog"');
+  process.exit(1);
+}