From ff9e13ca03d1a66721c9989e7a5a493e9f63f1db Mon Sep 17 00:00:00 2001
From: Anthony LC <anthony.le-courric@mail.numerique.gouv.fr>
Date: Tue, 5 Aug 2025 16:00:34 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=91=B7(CI)=20add=20bundle=20size=20check?=
 =?UTF-8?q?=20job?=
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Job that will give a report on the bundle size
of the frontend application.
Good to know if the bundle size is increasing or
decreasing and if the changes are acceptable.
---
 .github/workflows/impress-frontend.yml | 38 ++++++++++++++++++++++++++
 CHANGELOG.md                           |  4 +++
 2 files changed, 42 insertions(+)

diff --git a/.github/workflows/impress-frontend.yml b/.github/workflows/impress-frontend.yml
index 1d8193522c..9a2c3531f1 100644
--- a/.github/workflows/impress-frontend.yml
+++ b/.github/workflows/impress-frontend.yml
@@ -136,3 +136,41 @@ jobs:
           name: playwright-other-report
           path: src/frontend/apps/e2e/report/
           retention-days: 7
+
+  bundle-size-check:
+    runs-on: ubuntu-latest
+    needs: install-dependencies
+    if: github.event_name == 'pull_request'
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22.x"
+
+      - name: Restore the frontend cache
+        uses: actions/cache@v4
+        with:
+          path: "src/frontend/**/node_modules"
+          key: front-node_modules-${{ hashFiles('src/frontend/**/yarn.lock') }}
+          fail-on-cache-miss: true
+
+      - name: Check bundle size changes
+        uses: preactjs/compressed-size-action@v2
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          build-script: "build"
+          pattern: "./out/**/*.{css,js,html}"
+          exclude: "{**/*.map,**/node_modules/**}"
+          minimum-change-threshold: 500
+          compression: "gzip"
+          cwd: "./src/frontend/apps/impress"
+          show-total: true
+          strip-hash: "\\b\\w+\\."
+          omit-unchanged: true
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7fc30cbb0..1a15197de5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- 👷(CI) add bundle size check job #1268
+
 ### Changed
 
 - ⚡️(frontend) improve accessibility: