Add postpublish script for purging CDN cache

Author: bhousel

RELEASE.md

@@ -24,14 +24,3 @@ Set as latest release on GitHub:
 - Open https://github.com/rapideditor/country-coder/blob/main/CHANGELOG.md and copy the URL to the new release
 - Open https://github.com/rapideditor/country-coder/tags and pick the new tag you just pushed
 - There should be a link like "create a release from the tag", click that, and paste in the link to the changelog.
-
-
-### Purge JSDelivr CDN cache
-Include any URLs that anyone might request.
-
-```bash
-curl 'https://purge.jsdelivr.net/npm/@rapideditor/country-coder@latest/dist/country-coder.iife.js'
-curl 'https://purge.jsdelivr.net/npm/@rapideditor/country-coder@latest/dist/country-coder.iife.min.js'
-curl 'https://purge.jsdelivr.net/npm/@rapideditor/country-coder@5/dist/country-coder.iife.js'
-curl 'https://purge.jsdelivr.net/npm/@rapideditor/country-coder@5/dist/country-coder.iife.min.js'
-```

package.json

@@ -52,6 +52,7 @@
     "clean": "bun ./scripts/clean.ts",
     "format": "bun ./scripts/format-json.js",
     "lint": "eslint ./scripts ./src ./test",
+    "postpublish": "bun ./scripts/postpublish.ts",
     "start": "bun ./scripts/server.ts",
     "test": "bun test --dots --coverage ./test"
   },

scripts/postpublish.ts

@@ -0,0 +1,54 @@
+import { Glob } from 'bun';
+import { styleText } from 'node:util';
+
+const CDNRoot = 'https://purge.jsdelivr.net/npm/@rapideditor/country-coder';
+const packageJSON = await Bun.file('./package.json').json();
+
+// Gather versions that need cache invalidation
+const versions = ['@latest'];
+const match = packageJSON.version.match(/^(\d+)\.(\d+)/);
+if (match[1]) {
+  versions.push(`@${match[1]}`);   // major
+  if (match[2]) {
+    versions.push(`@${match[1]}.${match[2]}`);  // minor
+  }
+}
+
+
+postpublish();
+
+async function postpublish() {
+  const START = '🏗   ' + styleText('yellow', 'Running postpublish…');
+  const END = '👍  ' + styleText('green', 'postpublish done');
+
+  console.log('');
+  console.log(START);
+
+  console.log(styleText('blueBright', 'Pausing 10 seconds…'));
+  await Bun.sleep(10000);
+
+  // Purge the JSDelivr CDN caches.
+  // https://www.jsdelivr.com/documentation#id-purge-cache
+  console.log('');
+  console.log(styleText('blueBright', 'Purging JSDelivr caches…'));
+
+  const promises = [];
+  const glob = new Glob('./dist/**/*');
+  for (const filepath of glob.scanSync()) {
+    // Keep just the end part of the path without extension, e.g. `dist/json/file.json`
+    const path = filepath.replace(/(.*)(\/dist.*)/i, '$2');
+
+    for (const version of versions) {
+      const url = `${CDNRoot}${version}${path}`;
+      const promise = fetch(url)
+        .then(response => response.json())
+        .then(json => console.log(styleText('greenBright', `'${url}' → ${json.status}`)))
+        .catch(err => console.log(styleText('redBright', `'${url}' → ${err}`)));
+
+      promises.push(promise);
+    }
+  }
+
+  await Promise.all(promises);
+  console.log(END);
+}