Add verify script

src/verify.ts

@@ -0,0 +1,21 @@
+import xml2js from "xml2js";
+import fs from "fs";
+
+(async () => {
+  for (const feed of fs
+    .readdirSync("static/feeds")
+    .filter(file => !file.startsWith("."))) {
+    try {
+      const xml = await new xml2js.Parser().parseStringPromise(
+        fs.readFileSync(`static/feeds/${feed}`, "utf8")
+      );
+      if (xml?.feed?.updated === undefined)
+        throw new Error("Can’t find xml.feed.updated");
+      new xml2js.Builder().buildObject(xml);
+      console.log(`OK ${feed}`);
+    } catch (error) {
+      console.log(`ERROR ${feed}: ${error}`);
+    }
+  }
+  console.log("FINISHED");
+})();