From ea9c3563389375fb21101f3367c87013dce54ddd Mon Sep 17 00:00:00 2001
From: "codspeed-hq[bot]" <117304815+codspeed-hq[bot]@users.noreply.github.com>
Date: Wed, 13 May 2026 02:31:18 +0000
Subject: [PATCH] Update CodSpeed workflow to v4 with OIDC auth and add badge

---
 .github/workflows/codspeed.yml | 10 ++++++++--
 README.md                      |  2 ++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index 6208c20..d65cb02 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -4,8 +4,14 @@ on:
   push:
     branches: [master, main]
   pull_request:
+  # `workflow_dispatch` allows CodSpeed to trigger backtest
+  # performance analysis in order to generate initial data.
   workflow_dispatch:
 
+permissions:
+  contents: read
+  id-token: write
+
 jobs:
   benchmarks:
     name: Run benchmarks
@@ -25,9 +31,9 @@ jobs:
       - run: pnpm install
 
       - name: Run benchmarks under CodSpeed
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@v4
         with:
+          mode: simulation
           run: pnpm vitest bench --run --config vitest.bench.config.ts
-          token: ${{ secrets.CODSPEED_TOKEN }}
         env:
           NODE_ENV: production
diff --git a/README.md b/README.md
index 7874907..24ce2ca 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # intervaltree JS
 
+[![CodSpeed](https://img.shields.io/endpoint?url=https://codspeed.io/badge.json)](https://codspeed.io/hexsprite/intervaltree?utm_source=badge)
+
 A mutable, self-balancing interval tree for JavaScript/TypeScript.
 
 Written in TypeScript with no external dependencies. Uses an augmented AVL tree under the hood for O(log n) operations.