getsentry/sentry-snapshots-cocoa

All Skills > Feature Setup > Sentry Snapshots

Sentry Snapshots for Apple/Cocoa

Scope

• Goal: generate Apple snapshot images and upload them to Sentry Snapshots.
• Detect existing snapshot generation first, including Point-Free swift-snapshot-testing; preserve it when it already emits or can emit PNGs or JPEGs.
• Use the Sentry Wizard appleSnapshots flow only when setting up Sentry's first-party SnapshotPreviews solution.
• Use manual setup only if the wizard is unavailable, cannot resolve targets non-interactively after disambiguation, or fails after explicit disambiguation.
• Package-only SwiftPM: stop and ask for the host app/test target; standalone swift test rendering is not supported.

Detect

Do only enough detection to route before calling the wizard:

# SnapshotPreviews (Sentry first-party) -> prefer wizard / SnapshotPreviews routing
find . \( -name Package.swift -o -name Package.resolved -o -path '*/project.pbxproj' \) -print0 2>/dev/null | xargs -0 grep -lE "SnapshotPreviews" 2>/dev/null

# Point-Free swift-snapshot-testing -> preserve generator, swift-snapshot-testing CI path
find . \( -name Package.swift -o -name Package.resolved -o -path '*/project.pbxproj' \) -print0 2>/dev/null | xargs -0 grep -lE "swift-snapshot-testing|SnapshotTesting|assertSnapshot|__Snapshots__|TEST_RUNNER_SNAPSHOT_TESTING_RECORD" 2>/dev/null

# Required wizard input
find . -name '*.xcodeproj' -print 2>/dev/null | head -20

# Workflow shape
ls fastlane/Fastfile Gemfile 2>/dev/null

# Sentry auth presence only -> never print secret values
[ -n "$SENTRY_AUTH_TOKEN" ] && echo "SENTRY_AUTH_TOKEN=set" || echo "SENTRY_AUTH_TOKEN=unset"
[ -n "$SENTRY_ORG" ] && echo "SENTRY_ORG=set" || echo "SENTRY_ORG=unset"
[ -n "$SENTRY_PROJECT" ] && echo "SENTRY_PROJECT=set" || echo "SENTRY_PROJECT=unset"

Record: existing SnapshotPreviews setup, existing snapshot generator/library, output directory if known, Xcode project directory, CI provider, Fastlane, and Sentry auth. For each .xcodeproj match, record the containing directory for --xcode-project-dir; if find prints ./MyApp/MyApp.xcodeproj, pass ./MyApp, not the bundle path. Let the wizard detect app targets, hosted XCTest targets, and Swift previews only when no existing generator is present.

Route

Resolve routing in this order; setup is the primary path and CI is optional follow-up.

1. Select or create the image generator:
   • named generator wins;
   • multiple existing generators with no user choice -> ask;
   • existing non-SnapshotPreviews generator -> preserve it;
   • existing SnapshotPreviews -> use it;
   • no existing generator -> set up SnapshotPreviews by default for Sentry Snapshots or Apple snapshot testing.
2. For SnapshotPreviews, stop before setup/verification/CI if there is no .xcodeproj host app or no hosted XCTest target. These stops do not apply when preserving another generator.
3. For setup or verification:
   • existing non-SnapshotPreviews generator -> read references/snapshots.md;
   • existing SnapshotPreviews -> read references/snapshot-previews.md and references/snapshots.md;
   • new SnapshotPreviews setup -> read references/wizard-setup.md;
   • wizard reports no Swift previews -> ask before adding previews or choosing another generator.
4. For GitHub Actions/CI only after an image generator exists:
   • Point-Free swift-snapshot-testing -> read references/github-actions-swift-snapshot-testing.md and references/snapshots.md;
   • other non-SnapshotPreviews generator -> read references/snapshots.md and adapt existing CI/upload;
   • SnapshotPreviews, one simulator only, no matrix/fanout/selective CI -> read references/github-actions-simple.md;
   • SnapshotPreviews with multiple simulators, device families, matrix, or any selective CI -> read references/github-actions-fanout.md and references/snapshot-previews.md.

Optional References

| Need | Read | |---|---| | First-party SnapshotPreviews setup, disambiguation, or manual fallback | references/wizard-setup.md | | SnapshotPreviews metadata, rendering preferences, selective rendering, or SnapshotPreviews-specific troubleshooting | references/snapshot-previews.md | | Upload any generated snapshot images to Sentry with Fastlane, sentry-cli, manifests, CI notes, or upload troubleshooting | references/snapshots.md | | One-destination GitHub Actions workflow | references/github-actions-simple.md | | Multi-destination/fan-out GitHub Actions workflow | references/github-actions-fanout.md | | Point-Free swift-snapshot-testing GitHub Actions workflow | references/github-actions-swift-snapshot-testing.md |

Completion Checks

• The selected snapshot image generator is documented and preserved or configured according to the route above.
• Snapshot generation appears in the relevant local or CI test logs.
• Export directory contains .png files and any generated .json sidecars.
• Upload succeeds and prints a Sentry URL or snapshot id.
• Base branch upload is full; selective PR upload includes the full image-name manifest.