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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallTo schedule Loki screenshot checks, create a workflow in your CI provider that builds or serves your Storybook, then run Loki’s test command on the recurrence configured in that provider. Loki handles screenshot capture and visual comparison; the reviewed Loki documentation does not describe a built-in time scheduler or prescribe schedule syntax for a particular CI service.
What Loki schedules—and what it does not
Loki is used for visual regression testing of Storybook: it captures component screenshots and compares them with reference images. Its CI guidance shows building a static Storybook and running Loki against it. Recurrence is a separate concern: configure the scheduler in your chosen CI provider to start that workflow. Loki’s CI documentation does not establish provider-specific cron syntax, recurrence limits, or a native Loki timer.
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This is a Storybook testing workflow, not a general-purpose scheduler for arbitrary public websites. The CI job must make the Storybook build or server available to Loki; Loki does not start that server for you. The Loki project documentation lists Chrome in Docker, Chrome in AWS Lambda, local Chrome, and iOS and Android simulators among execution targets; check the current project documentation for compatibility with your setup.
Prepare Loki references before scheduling recurring checks
- Make Storybook available. Configure the CI job to build Storybook or start the server Loki will use. Loki does not provision or launch it automatically.
- Create initial reference screenshots. Use Loki’s
updateworkflow to generate references, then review them. The CLI also provides anapprovecommand for managing references; consult the CLI documentation for current command details. - Keep references accessible to CI. Commit the approved reference images or otherwise make them available to the scheduled job so comparisons use the intended baseline.
- Run a test before enabling recurrence. Confirm the CI environment can build Storybook, launch the required browser target, find the references, and produce current screenshots and differences.
Configure the scheduled CI workflow
Set the recurrence in the scheduler for your CI provider, then have that scheduled workflow build Storybook and invoke Loki in test mode. Loki’s CI example uses a static build and the following command pattern:
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loki --requireReference --reactUri file:./storybook-staticAdapt the invocation to the installed Loki version and your project’s package scripts. The --reactUri file:./storybook-static argument points Loki at the static Storybook output in this example. --requireReference makes the run fail if a reference image is missing, rather than treating an absent baseline as an ordinary comparison. See the CI example and CLI reference before adopting exact command details.
The reviewed Loki documentation does not specify a CI provider’s schedule syntax. Use the selected provider’s current documentation for configuring timed runs and any manual-dispatch option. A useful schedule should also account for who will inspect failures and whether the workflow can run with the permissions and resources it needs.
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Read test results without silently changing the baseline
Loki’s test command captures screenshots and compares them with references. By default, its CLI documentation names these output directories:
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems| Output | Default directory | How to use it |
|---|---|---|
| Reference screenshots | ./.loki/reference |
The baseline images used for comparison. |
| Current screenshots | ./.loki/current |
The images produced by the current test run. |
| Differences | ./.loki/difference |
Visual changes to inspect when a comparison fails. |
These locations are documented in the Loki CLI guide. Preserve current screenshots and differences as CI artifacts if your provider supports it, and choose retention settings according to your review needs; Loki’s cited CLI documentation does not prescribe an artifact retention period.
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A scheduled test should report changes, not silently bless them. Inspect the differences, determine whether the visual change is expected, and only then use Loki’s reference-management workflow to update or approve the baseline. The getting-started guide covers the reference workflow.
Make recurring runs reproducible
Scheduled checks are useful only when the environment can reproduce the comparison. Keep the Storybook build, reference images, browser target, and relevant runtime configuration consistent between runs. Account for external dependencies that can change what Storybook renders, and avoid treating every difference as a product regression without reviewing the images.
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When choosing a CI setup, check whether it supports the recurrence and manual runs you need, whether it can reliably build or reach Storybook, how consistently it runs the browser environment, how it retains screenshots and diffs, and how reviewers approve intentional baseline changes. The Loki repository documents several execution targets, but compatibility can change, so verify the current documentation for your chosen target.
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Troubleshoot common scheduled-run failures
- Loki cannot reach Storybook: The build or server may not have completed, or the URI may not point to the output location. Ensure the workflow makes Storybook available before invoking Loki and verify the URI, including
file:./storybook-staticwhen using the documented static-build pattern. - The run fails because a reference is missing: With
--requireReference, missing baselines cause failure. Generate and review the needed references using the update workflow, then make them accessible to CI. - Differences appear unexpectedly: Inspect the current and difference output directories. Check whether the Storybook content or test environment changed before approving a new baseline.
- The scheduled workflow does not start: Loki does not provide the timer in the reviewed documentation. Check the CI provider’s schedule configuration, recurrence rules, and workflow triggers in that provider’s current documentation.
- Browser execution fails in CI: Confirm that the selected Loki execution target is supported and correctly available in the job environment. Use the current Loki project documentation to validate target compatibility.
Or skip the browser setup
If you need a website screenshot API rather than Loki’s Storybook visual-regression workflow, ScreenshotNeo takes a screenshot from one GET request. For example, using cURL:
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Frequently Asked Questions
Does Loki have a built-in schedule for screenshot tests?
The reviewed Loki documentation describes running in CI, but not a native time scheduler. Configure recurrence in your CI provider.
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The documented use here is visual regression testing for Storybook. It does not establish a general-purpose scheduler for arbitrary public websites.
Quick Recap
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