feat(package): add version hook

Author: saschanaz

.npmrc

@@ -0,0 +1 @@
+message="chore(package): bump version number to v%s"

package.json

@@ -18,7 +18,8 @@
     "baseline-accept": "cpx \"generated\\*\" baselines\\",
     "lint": "eslint --max-warnings 0 src",
     "test": "npm run lint && npm run build && node ./lib/test.js && node ./unittests/index.js",
-    "changelog": "tsc && node ./lib/changelog.js"
+    "changelog": "tsc && node ./lib/changelog.js",
+    "version": "tsc && node ./lib/version.js"
   },
   "author": {
     "name": "Kagami Sascha Rosylight",

src/changelog.ts

@@ -1,5 +1,6 @@
 import { execSync } from "child_process";
 import ts from "typescript";
+import { fileURLToPath } from "url";
 
 function gitShowFile(commit: string, path: string) {
   return execSync(`git show ${commit}:${path}`, { encoding: "utf-8" });
@@ -136,7 +137,7 @@ function writeAddedRemovedInline(added: Set<string>, removed: Set<string>) {
 
 const dom = "baselines/dom.generated.d.ts";
 
-async function main() {
+export function generate(): string {
   const [base = gitLatestTag(), head = "HEAD"] = process.argv.slice(2);
   const previous = gitShowFile(base, dom);
   const current = gitShowFile(head, dom);
@@ -165,11 +166,14 @@ async function main() {
   }
 
   const output = outputs.join("\n\n");
-  if (output.length) {
-    console.log(output);
-  } else {
+
+  if (!output.length) {
     throw new Error(`No change reported between ${base} and ${head}.`);
   }
+
+  return output;
 }
 
-await main();
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+  console.log(generate());
+}

src/version.ts

@@ -0,0 +1,15 @@
+import { execSync } from "child_process";
+import { readFile, writeFile } from "fs/promises";
+import { generate } from "./changelog.js";
+
+const output = generate();
+
+const path = new URL("../CHANGELOG.md", import.meta.url);
+
+const content = await readFile(path, "utf-8");
+
+const { npm_package_version } = process.env;
+
+await writeFile(path, `# v${npm_package_version}\n\n${output}\n\n${content}`);
+
+execSync("git add CHANGELOG.md");