fix(push): render git push branch deletions as a delete message

server/lib/formatters/push.ts

@@ -25,8 +25,30 @@ export function formatPush(
   const baseUrl = repoBaseUrl(payload, repo);
   const forced = payload.forced as boolean | undefined;
   const created = payload.created as boolean | undefined;
+  const deleted = payload.deleted as boolean | undefined;
   const em = (e: string): string => emojiPrefix(e, showEmoji);
 
+  // A branch/tag deletion pushed via `git push --delete` arrives as a push
+  // event with `deleted: true` and no commits — render it like the `delete`
+  // event instead of a confusing "0 commits pushed".
+  if (deleted) {
+    const refType = isTagPush ? "tag" : "branch";
+    return buildMessage(
+      {
+        author,
+        title: t("events.delete.title", {
+          repo: repo ?? t("common.repository"),
+          emoji: em(isTagPush ? "🏷️" : "🌿"),
+          type: refType,
+          ref: isTagPush ? tagLink(baseUrl, rawRef, ref) : branchLink(baseUrl, rawRef, ref),
+        }),
+        color: GITHUB_COLORS.delete,
+      },
+      t,
+      repo,
+    );
+  }
+
   const descriptionParts: string[] = [];
 
   if (forced) {

tests/formatter.test.ts

@@ -299,6 +299,28 @@ describe("group emoji toggle", () => {
     expect(msg.description).not.toContain("🔗");
   });
 
+  it("push with deleted:true renders as a branch deletion", () => {
+    const msg = formatEvent(
+      route,
+      event("push", {
+        ref: "refs/heads/dependabot/npm_and_yarn/multi-e1b34b8be3",
+        before: "abcd1234ef",
+        after: "0000000000000000000000000000000000000000",
+        created: false,
+        forced: false,
+        deleted: true,
+        commits: [],
+        repository: repo,
+        sender,
+      }),
+    );
+    expect(msg.title).toBe(
+      "acme/widget: 🌿 Deleted branch [`dependabot/npm_and_yarn/multi-e1b34b8be3`](https://github.com/acme/widget/tree/dependabot/npm_and_yarn/multi-e1b34b8be3)",
+    );
+    expect(msg.description).toBeUndefined();
+    expect(msg.fields).toBeUndefined();
+  });
+
   it("push commit renders linked short hash with plain-text message", () => {
     const msg = formatEvent(
       route,