🤖 Add Chromatic for visual regression testing (#383)

Author: kylecarbs

.github/workflows/chromatic.yml

@@ -0,0 +1,36 @@
+name: Chromatic
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  chromatic:
+    name: Visual Regression Testing
+    runs-on: ${{ github.repository_owner == 'coder' && 'depot-ubuntu-22.04-8' || 'ubuntu-latest' }}
+    # Skip for forked PRs since they don't have access to secrets
+    if: github.event.pull_request.head.repo.full_name == github.repository || github.event_name == 'push'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Required for Chromatic to track changes
+
+      - uses: ./.github/actions/setup-cmux
+
+      - name: Generate version file
+        run: ./scripts/generate-version.sh
+
+      - name: Build Storybook
+        run: bun x storybook build --stats-json
+
+      - name: Run Chromatic
+        uses: chromaui/action@latest
+        with:
+          projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}
+          exitZeroOnChanges: true
+          onlyChanged: true
+

Makefile

@@ -38,7 +38,7 @@ include fmt.mk
 .PHONY: test test-unit test-integration test-watch test-coverage test-e2e
 .PHONY: dist dist-mac dist-win dist-linux
 .PHONY: docs docs-build docs-watch
-.PHONY: storybook storybook-build test-storybook
+.PHONY: storybook storybook-build test-storybook chromatic
 .PHONY: benchmark-terminal
 .PHONY: ensure-deps
 .PHONY: check-eager-imports check-bundle-size check-startup
@@ -252,6 +252,9 @@ storybook-build: node_modules/.installed src/version.ts ## Build static Storyboo
 test-storybook: node_modules/.installed ## Run Storybook interaction tests (requires Storybook to be running or built)
 	@bun x test-storybook
 
+chromatic: node_modules/.installed ## Run Chromatic for visual regression testing
+	@bun x chromatic --exit-zero-on-changes
+
 ## Benchmarks
 benchmark-terminal: ## Run Terminal-Bench with the cmux agent (use TB_DATASET/TB_SAMPLE_SIZE/TB_ARGS to customize)
 	@TB_DATASET=$${TB_DATASET:-terminal-bench-core==0.1.1}; \

bun.lock

@@ -58,6 +58,7 @@
         "@typescript/native-preview": "^7.0.0-dev.20251014.1",
         "@vitejs/plugin-react": "^4.0.0",
         "babel-plugin-react-compiler": "^1.0.0",
+        "chromatic": "^13.3.1",
         "cmdk": "^1.0.0",
         "concurrently": "^8.2.0",
         "dotenv": "^17.2.3",
@@ -1074,6 +1075,8 @@
 
     "chownr": ["chownr@2.0.0", "", {}, "sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ=="],
 
+    "chromatic": ["chromatic@13.3.1", "", { "peerDependencies": { "@chromatic-com/cypress": "^0.*.* || ^1.0.0", "@chromatic-com/playwright": "^0.*.* || ^1.0.0" }, "optionalPeers": ["@chromatic-com/cypress", "@chromatic-com/playwright"], "bin": { "chroma": "dist/bin.js", "chromatic": "dist/bin.js", "chromatic-cli": "dist/bin.js" } }, "sha512-qJ/el70Wo7jFgiXPpuukqxCEc7IKiH/e8MjTzIF9uKw+3XZ6GghOTTLC7lGfeZtosiQBMkRlYet77tC4KKHUng=="],
+
     "chromium-pickle-js": ["chromium-pickle-js@0.2.0", "", {}, "sha512-1R5Fho+jBq0DDydt+/vHWj5KJNJCKdARKOCwZUen84I5BreWoLqRLANH1U87eJy1tiASPtMnGqJJq0ZsLoRPOw=="],
 
     "ci-info": ["ci-info@3.9.0", "", {}, "sha512-NIxF55hv4nSqQswkAeiOi1r83xy8JldOFDTWiug55KBu9Jnblncd2U6ViHmYgHf01TPZS77NJBhBMKdWj9HQMQ=="],

chromatic.config.json

@@ -0,0 +1,9 @@
+{
+  "projectId": "68e30fca49979473fc9abc73",
+  "buildScriptName": "storybook:build",
+  "storybookBuildDir": "storybook-static",
+  "exitZeroOnChanges": true,
+  "exitOnceUploaded": true,
+  "autoAcceptChanges": false
+}
+

package.json

@@ -41,7 +41,8 @@
     "docs:watch": "make docs-watch",
     "storybook": "make storybook",
     "storybook:build": "make storybook-build",
-    "test:storybook": "make test-storybook"
+    "test:storybook": "make test-storybook",
+    "chromatic": "make chromatic"
   },
   "dependencies": {
     "@ai-sdk/anthropic": "^2.0.29",
@@ -98,17 +99,18 @@
     "@typescript/native-preview": "^7.0.0-dev.20251014.1",
     "@vitejs/plugin-react": "^4.0.0",
     "babel-plugin-react-compiler": "^1.0.0",
+    "chromatic": "^13.3.1",
     "cmdk": "^1.0.0",
     "concurrently": "^8.2.0",
     "dotenv": "^17.2.3",
     "electron": "^38.2.1",
     "electron-builder": "^24.6.0",
     "electron-devtools-installer": "^4.0.0",
     "electron-mock-ipc": "^0.3.12",
+    "escape-html": "^1.0.3",
     "eslint": "^9.36.0",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^5.2.0",
-    "escape-html": "^1.0.3",
     "jest": "^30.1.3",
     "mermaid": "^11.12.0",
     "playwright": "^1.56.0",