From 9b8a49c34edc6075aad7213da5b8efc87809dcb1 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Sun, 18 Aug 2024 21:26:03 +0200
Subject: [PATCH] fix: prevent accidental branch backport duplication

---
 src/index.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index fb3f796..ce76700 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -543,13 +543,14 @@ const probotHandler: ApplicationFunction = async (robot, { getRouter }) => {
         name: 'backport to branch',
         command: /^run backport-to (([^,]*)(, ?([^,]*))*)/,
         execute: async (targetBranches: string) => {
-          const branches = targetBranches.split(',').map((b) => b.trim());
+          const branches = new Set(
+            targetBranches.split(',').map((b) => b.trim()),
+          );
           for (const branch of branches) {
             robot.log(
               `Initiating backport to \`${branch}\` from 'backport-to' comment`,
             );
 
-            if (!branch.trim()) continue;
             const pr = (
               await context.octokit.pulls.get(
                 context.repo({ pull_number: issue.number }),