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What Loki schedules—and what it does not
Loki is for visual regression testing of Storybook, not a general-purpose scheduler for taking screenshots of arbitrary websites. Its test command captures Storybook screens and compares them with reference images. To run that check regularly, schedule a CI workflow that makes Storybook available and invokes Loki.
The recurrence, manual-run option, and schedule syntax depend on your CI provider. Check that provider’s current documentation for the exact configuration; Loki’s documented CI example does not specify it. Loki also does not start the Storybook server for you, so the workflow must build or serve Storybook before testing.
Prepare Loki references before scheduling recurring runs
1. Create and review the baseline
Use Loki’s reference-update workflow to create initial screenshots, then review them before treating them as the expected appearance. The Loki getting-started guide covers getting a project set up, while the CLI documentation describes its commands.
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2. Keep scheduled tests separate from baseline approval
A scheduled check should run Loki in test mode, not automatically approve new screenshots. When a run finds differences, inspect the current captures and diff output; update or approve references only after confirming that the visual change is intentional.
Configure the recurring CI workflow
- Make Storybook available. Build a static Storybook or start it in the environment in a way Loki can access. Loki’s CI example builds Storybook as a static site and uses a file URI.
- Make references available to the job. Keep reference screenshots in the repository or otherwise ensure the CI job can access them. A run without the intended baseline cannot provide a meaningful comparison.
- Run Loki in test mode. The official Loki CI example uses
--requireReferenceand--reactUri file:./storybook-staticafter building the static Storybook. For example, the core test invocation is:
loki --requireReference --reactUri file:./storybook-staticUse the appropriate package-script or executable invocation for your project, and confirm the flags against the current Loki CLI documentation. --requireReference makes a missing reference image fail the run rather than letting the check pass without a baseline.
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- Add recurrence in the CI provider. Configure the provider’s workflow scheduler to invoke the job at the cadence you want. Also consider enabling a manual dispatch if your provider supports it, so you can verify changes without waiting for the next scheduled run.
- Retain useful output. Configure CI artifacts, if available, to preserve current screenshots and differences for review. Artifact retention and scheduler behavior are provider-specific; Loki’s directory names do not establish how long CI keeps files.
Where Loki writes screenshots and differences
The Loki CLI documentation lists these default output locations:
| Output | Default directory | Use |
|---|---|---|
| Reference screenshots | ./.loki/reference |
Expected images used for comparison. |
| Current screenshots | ./.loki/current |
Images captured by the latest run. |
| Difference images | ./.loki/difference |
Visual comparison output to inspect when a test fails. |
These are the documented defaults; check your project’s Loki configuration and current CLI documentation if you have customized output paths.
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Make scheduled runs reproducible
A recurring job is useful only if its inputs are stable enough for meaningful comparisons. Keep the Storybook build, browser execution environment, and available reference images consistent between runs. Loki’s repository lists execution targets including Chrome in Docker, Chrome in AWS Lambda, local Chrome, and iOS and Android simulators; consult the current Loki repository for compatibility details before choosing a target.
When choosing a CI scheduler, check whether it supports the recurrence you need and manual dispatch, whether it can reliably build or access Storybook, and whether it can retain screenshots and diffs for review. Treat a changed screenshot as a finding to investigate, not as permission to rewrite the baseline.
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Troubleshoot failed scheduled checks
- Loki cannot reach Storybook: The build or server may not be ready, or the URI may point to the wrong location. Ensure Storybook is available before Loki runs and verify the URI; the documented static-build pattern is
file:./storybook-static. - The run fails because a reference is missing: With
--requireReference, this is expected when a required baseline is unavailable. Create and review references through the update workflow, then make them accessible to the CI job. - The run reports visual differences: Review the current and difference outputs. Determine whether the change is intended before using Loki’s update or approve commands to change references.
- Scheduled runs behave differently from local runs: Compare the Storybook build and browser/device target used in each environment. The chosen CI provider’s runtime and scheduling details are outside Loki’s documented scheduler guidance.
- You cannot find Loki schedule settings: Configure recurrence in your CI provider’s workflow scheduler. Loki’s reviewed documentation describes CI test execution, not a native time scheduler.
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