Files
webstudio/package.json
Oleg Isonen db2d092268 ci: replace Lost Pixel with self-hosted visual regression (#6086)
## Summary

Replace the defunct Lost Pixel service and the interim Chromatic
workflow with a fast, self-hosted visual comparison pipeline.

The workflow indexes the existing CSF stories without building
Storybook, builds and serves a lightweight browser app with Vite,
renders the merge base and current revision through Webstudio's shared
browser tooling, and compares screenshots with Webstudio's pixel-diff
and OCR engine. It uses GitHub Actions cache and artifacts only—no R2
bucket or external visual-testing service.

Closes #6064

## Implementation

- [x] Remove the Lost Pixel workflow, configuration, acknowledgement,
and global two-second wait.
- [x] Remove the interim Chromatic workflow and settings.
- [x] Extract source-agnostic capture, diff, OCR, audit, cache, and
report tooling into `@webstudio-is/vision`; rename the
Webstudio-specific preview boundary to
`@webstudio-is/project-build/preview`.
- [x] Expose the reusable browser capture session through the shared
vision boundary.
- [x] Make OCR and diff-artifact generation conditional on detected
pixel changes.
- [x] Render existing CSF stories through a typed, lightweight browser
harness built with Vite.
- [x] Replace the embedded HTML and handwritten HTTP/MIME server with a
real HTML entry, Vite production build, and Vite preview server; isolate
declarative build configuration in `story-build.ts`.
- [x] Apply Storybook preview annotations, decorators, global CSS,
backgrounds, and story metadata.
- [x] Store story scopes as shared data and load each revision's own
configuration.
- [x] Discover changed, added, and removed stories from both revisions.
- [x] Populate private story sources symmetrically in the baseline
worktree.
- [x] Isolate every story with a fresh React root and deterministic
time, randomness, intervals, focus, animation, and layout readiness.
- [x] Preserve story-owned visual options for masking, settling, and
interval control.
- [x] Reuse Vite preview servers, one Chromium process, grouped browser
pages, production bundles, and a bounded CPU worker pool for image
comparison.
- [x] Recheck initial pixel differences with serial captures, then
recapture persistent baseline/current pairs on the same browser page so
renderer variance cannot create false failures.
- [x] Report individual story render failures without discarding
successful captures.
- [x] Enforce a 0.1 per-pixel threshold and 0.001% total mismatch
tolerance.
- [x] Run OCR only for changed comparisons and include text-change
evidence.
- [x] Move the generic report model, writer, static viewer, and opener
into the shared Vision package for reuse by CI and future CLI
comparisons.
- [x] Bundle report HTML, styling, and browser behavior as static Vision
assets without runtime source-file lookups.
- [x] Copy external screenshot inputs into self-contained report
artifacts for CLI reuse.
- [x] Handle cached removed-only comparisons without rendering the
removed story on the current server.
- [x] Support focused local reproduction and opening the report with one
command.
- [x] Pin CI to the lockfile's Playwright Chromium, cache complete
revision screenshots with matching restore/save paths and automatically
derived runtime invalidation, and render both revisions on a miss.
- [x] Keep cache archives bounded to one revision instead of
accumulating the cache history.
- [x] Run the complete visual suite in one CI job and upload one report
as a 14-day artifact.
- [x] Fail PR checks on visual differences, empty runs, missing
screenshots, missing or empty report artifacts, and infrastructure
failures.
- [x] Rerun fork checks when `safe-to-deploy` is added.
- [x] Allow reviewed visual-only differences through
`visual-change-approved` and invalidate approval after new commits.
- [x] Keep capture, pixel diff, OCR, and report generation
source-agnostic for future draft-versus-published project comparisons.
- [x] Use Vite for the complete story HTML, module, asset,
production-build, and preview-server lifecycle; inline the selected
stories and skip ineffective tree-shaking to keep the cached run under
one minute.
- [x] Review Builder product documentation impact: no user-facing
Builder documentation is affected; contributor usage is documented in
`scripts/visual-regression/README.md`.
- [x] Review fixture impact: no fixture inputs or generated fixture
outputs are affected.

## Verification

- [x] Project-build Vision tests, including the reusable report test,
and entrypoint contract tests pass.
- [x] CLI screenshot, preview, and browser-session tests pass.
- [x] Project-build, CLI, Builder, design-system, and visual-runner
typechecks pass.
- [x] Visual runner tests pass (10), and the complete Vision package
passes (79), including demonstrated fail-before/pass-after coverage.
- [x] Full Storybook production build passes.
- [x] Full local Vite run completes all 238 stories in 69.9s cold and
50.3s with a cached baseline plus two same-page serial verifications,
with zero differences; identical-image comparison remains sub-second.
- [x] The report writer passes a bundled-output smoke test and
materializes external screenshot assets.
- [x] The generated report validates all 238 entries and referenced
images.
- [x] Hosted cached-baseline comparison completes all 238 stories in
52.9s with zero differences; the cache-miss fallback completes in
101.3s.
- [x] Cache-miss fallback renders both Git revisions on demand.
- [x] Visual differences produce baseline, current, diff, OCR, JSON, and
HTML evidence and fail without approval.
- [x] Hosted single-job visual workflow restores both the pinned browser
and baseline cache, validates all 238 public and private stories with
zero differences, and uploads the report.
- [x] The final Vite production build renders all 238 stories without
dependency invalidation or duplicate React runtimes, and restores
`NODE_ENV` so cached serial fallback installs the baseline's dev
dependencies.
- [x] Root lint, package-boundary validation, and relevant formatting
checks pass.
- [x] Workflow YAML parses successfully.
- [x] `git diff --check`, staged-diff review, and final worktree review
pass.

## Usage

Run the complete local comparison and open the visual report:

```sh
pnpm visual-regression:ui
```

Focus one component while iterating:

```sh
pnpm visual-regression:ui -- --grep "Design system/Button"
```

Reopen the latest report without rerunning:

```sh
pnpm visual-regression:report
```

The CI report is available as the `visual-regression-report` artifact.

## Tradeoffs

- Baseline screenshots are a disposable acceleration cache, not source
of truth. A missing or invalid cache renders the merge base directly
from Git.
- GitHub artifact storage provides downloadable one-click reports;
permanently hosted browser links would require another hosting surface.
- OCR runs after pixel triage because invoking Tesseract for every
unchanged story would make the common path unnecessarily slow.
- Vite production builds add Rollup's module graph and HTML/asset
pipeline. The runner emits one bundle because every selected story is
rendered, and skips tree-shaking because it removed little while
increasing build time.
- The verified local path is 50.3s cached and 69.9s cold. The hosted
path is 52.9s cached and 101.3s cold. A new browser/runtime cache must
render its baseline once; the pinned browser keeps later runners on the
reusable path.
- The complete suite stays in one Actions job; browser-page concurrency
is internal and bounded.
2026-08-12 10:55:52 +02:00

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{
"packageManager": "pnpm@9.14.4",
"name": "webstudio-root",
"version": "0.0.0",
"private": true,
"type": "module",
"scripts": {
"build": "pnpm -r --filter='!./fixtures/*' build",
"webstudio": "node packages/cli/local.js",
"dts": "pnpm -r dts",
"dev": "bash ./apps/builder/dev/run-local.sh",
"evaluations": "pnpm --filter webstudio evaluations",
"lint": "oxlint --deny-warnings",
"check:package-boundaries": "node scripts/check-package-boundaries.mjs",
"check:generated-api": "pnpm --filter @webstudio-is/project-build generate-runtime-operation-contracts && pnpm --filter @webstudio-is/builder generate-server-only-api-metadata && node scripts/check-clean-files.mjs packages/project-build/src/contracts/__generated__/runtime-operation-contracts.ts packages/protocol/src/builder-api/__generated__/server-only-router-operation-metadata.ts",
"check:generated-docs": "pnpm --filter @webstudio-is/project-build generate-docs && pnpm --filter webstudio generate-docs && pnpm docs:mcp:test && pnpm docs:mcp:typecheck && pnpm docs:content-engine:test && pnpm docs:mcp:check && pnpm docs:content-engine:check && node scripts/check-clean-files.mjs packages/project-build/src/docs.generated.ts packages/cli/src/docs.generated.ts",
"docs:mcp:sync": "tsx scripts/docs/generate-mcp-docs.ts",
"docs:mcp:check": "pnpm docs:mcp:sync && node scripts/check-clean-files.mjs docs/university/mcp.md",
"docs:mcp:test": "tsx --test scripts/docs/generate-mcp-docs.test.ts",
"docs:mcp:typecheck": "tsc --noEmit -p scripts/docs/tsconfig.json",
"docs:content-engine:sync": "tsx scripts/docs/generate-content-engine-docs.ts",
"docs:content-engine:check": "pnpm docs:content-engine:sync && node scripts/check-clean-files.mjs docs/university/foundations/content-engine-reference.md",
"docs:content-engine:test": "tsx --test scripts/docs/generate-content-engine-docs.test.ts && pnpm --filter webstudio exec vitest run src/content-engine-reference.test.ts",
"fixtures": "pnpm -r fixtures:link && pnpm -r fixtures:sync && pnpm -r fixtures:build",
"checks": "pnpm -r test && pnpm -r typecheck && pnpm lint && pnpm check:package-boundaries && pnpm check:generated-api && pnpm check:generated-docs && pnpm fixtures",
"e2e:builder": "bash ./apps/builder/e2e/run-local.sh",
"e2e:builder:build": "pnpm --filter=@webstudio-is/builder build",
"e2e:builder:dev:backend": "E2E_SKIP_CLEANUP=true E2E_RUN_TESTS=false E2E_START_POSTGREST=true E2E_DB_BOOTSTRAP=if-empty E2E_INSTALL_PLAYWRIGHT=false bash ./apps/builder/e2e/run-local.sh",
"e2e:builder:dev": "E2E_SKIP_CLEANUP=true E2E_DB_BOOTSTRAP=if-empty E2E_INSTALL_PLAYWRIGHT=false E2E_BUILDER_URL=${E2E_BUILDER_URL:-https://127.0.0.1:3000} bash ./apps/builder/e2e/run-local.sh",
"e2e:builder:refresh-schema-cache": "E2E_DB_BOOTSTRAP=migrations E2E_WRITE_SCHEMA_SNAPSHOT=true E2E_RUN_TESTS=false bash ./apps/builder/e2e/run-local.sh",
"playwright": "pnpm -r playwright-init",
"format": "oxfmt",
"storybook:dev": "storybook dev -p 6006",
"storybook:build": "storybook build",
"visual-regression": "tsx --conditions=webstudio scripts/visual-regression/run.ts",
"visual-regression:ui": "tsx --conditions=webstudio scripts/visual-regression/run.ts --open-report",
"visual-regression:report": "tsx scripts/visual-regression/open-report.ts",
"visual-regression:test": "tsx --test scripts/visual-regression/*.test.ts",
"visual-regression:typecheck": "tsc -p scripts/visual-regression/tsconfig.json",
"migrations": "pnpm --filter=@webstudio-is/prisma-client generate && pnpm --filter=./packages/prisma-client migrations --dev --cwd ../../apps/builder",
"prepare": "which git && git config core.hooksPath .git/hooks/ && simple-git-hooks || echo git not installed",
"local:version-snapshot": "pnpm -r exec pnpm version prepatch --preid $(cat /dev/urandom | LC_ALL=C tr -dc 'a-z' | fold -w 8 | head -n 1)",
"local:publish-snapshot": "pnpm -r publish --access public --no-git-checks --registry http://localhost:4873",
"local:dangerously-undo-version-snapshot": "git restore --source=$(git branch --show-current) '**/*/package.json'",
"local:release": "pnpm build && pnpm dts && pnpm local:version-snapshot && pnpm local:publish-snapshot && pnpm local:dangerously-undo-version-snapshot && echo \"now execute\npnpm up -r -L '@webstudio-is/*' --registry http://localhost:4873\"",
"clean:deep": "bash ./cleanup.sh"
},
"simple-git-hooks": {
"pre-commit": "./node_modules/.bin/nano-staged"
},
"devDependencies": {
"@fontsource-variable/inter": "^5.0.20",
"@fontsource-variable/manrope": "^5.0.20",
"@fontsource/roboto-mono": "^5.0.18",
"@modelcontextprotocol/sdk": "^1.10.0",
"@radix-ui/react-tooltip": "^1.2.4",
"@storybook/addon-actions": "^8.6.4",
"@storybook/addon-backgrounds": "^8.6.4",
"@storybook/addon-controls": "^8.6.4",
"@storybook/react": "^8.6.4",
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"@types/node": "^22.13.10",
"@types/react": "^18.2.70",
"@types/react-dom": "^18.2.25",
"@webstudio-is/project-build": "workspace:^",
"@webstudio-is/vision": "workspace:^",
"esbuild": "^0.25.3",
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"oxfmt": "0.58.0",
"oxlint": "^1.73.0",
"parse5": "7.3.0",
"react": "18.3.0-canary-14898b6a9-20240318",
"react-dom": "18.3.0-canary-14898b6a9-20240318",
"simple-git-hooks": "^2.11.1",
"storybook": "^8.6.4",
"tsx": "^4.19.3",
"typescript": "7.0.2",
"webstudio": "workspace:^",
"vite": "^6.3.4"
},
"engines": {
"node": "22",
"pnpm": "^9.14.0",
"yarn": "This project is configured to use pnpm"
},
"nano-staged": {
"*.{ts,tsx,js,json,css,md}": "oxfmt"
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"pnpm": {
"overrides": {
"@types/react": "^18.2.70",
"@types/react-dom": "^18.2.25",
"react": "18.3.0-canary-14898b6a9-20240318",
"react-dom": "18.3.0-canary-14898b6a9-20240318",
"vite@<7": "6.3.4"
},
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}
}
}