To get reliable Loki screenshots of an Indian-language Storybook, load the intended script-specific font in Storybook’s preview iframe, make sure the font and layout are ready before capture, and compare against deliberately approved reference images. Loki does not provide a universal font-wait setting documented for every release, so verify your installed version and make font loading deterministic in the browser target you use.
What you need before configuring Loki
- An existing Storybook project and its current Loki setup. Check your installed versions and project configuration before copying commands; Loki’s documentation and command options can vary by release.
- Node.js 16 or newer, as specified by Loki’s getting-started documentation.
- A font stack chosen for the actual language and writing system in your stories. A Hindi font choice is not a universal choice for every Indian language.
- A stable browser target and representative, approved interface text for your baseline stories.
Loki’s web getting-started guide recommends Chrome in Docker; it also documents local Chrome and other targets. Loki does not start Storybook for you: start the development server or serve a built Storybook before running captures. See Loki’s getting-started documentation.
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Initialize Loki and capture a baseline
The following is the documented Yarn workflow. Confirm that the commands and browser configuration match the Loki release already installed in your repository.
- Install and initialize: run
yarn add loki --dev, thenyarn loki init. The initializer detects the project type and adds default configuration topackage.json. - Start Storybook: run your project’s normal Storybook server command, or build and serve its static output. Keep it available while Loki captures.
- Choose representative stories: include real approved interface copy in the target language, relevant numerals and punctuation, and the text sizes and layout states most likely to expose wrapping or font differences.
- Create reference images: run
yarn loki updateafter confirming the intended font and layout render correctly. - Compare changes: run
yarn loki test, then inspect the current captures and differences before accepting an update.
Loki documents screenshots and differences under loki/current and loki/difference. Commit references with the code; Loki also documents using Git LFS for reference images. Treat a baseline update as a review decision, not as an automatic way to silence a diff. Workflow details are in Loki’s getting-started guide.
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Load the right font in Storybook’s preview iframe
Storybook components render in the preview iframe (also called Canvas), not in the surrounding manager interface. Put font stylesheet links or preload links in .storybook/preview-head.html so they reach the rendering context. If your font files live in a configured static directory, use the path Storybook serves for those assets. Storybook explains the iframe and its head customization in Story rendering.
For example, a project might add a stylesheet link in .storybook/preview-head.html:
<link rel="stylesheet" href="/fonts/app-fonts.css">
The path and stylesheet are illustrative; use the URL and family names actually served by your project. A preload can make a local font available earlier, but it does not prove that the stylesheet requested the intended file or that the browser rendered text with it. Check the font request and computed/rendered family in the browser used for Loki.
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Choose a stack for the specific script
Noto’s guidance gives a Hindi sans-serif example using Noto Sans Devanagari, Noto Sans, Noto Sans Symbols 2, and generic sans-serif. Its Tamil example includes Noto Sans Tamil. Adapt the stack to the interface’s actual language and design; a stack for one script should not be treated as a general solution for all Indian-language text. See Noto’s font guidance.
CSS tries later family names when earlier families do not provide needed characters. That fallback is useful for coverage, but it can hide a missing intended font. Make a font-loading failure diagnosable by checking the actual loaded font and by reviewing glyph shape, line breaks, and spacing—not only whether every character appears.
Wait for fonts and layout before capture
If capture begins before web fonts load, Loki can record fallback typography, altered wrapping, or a shifted layout. In browser code you control, await document.fonts.ready before taking the screenshot. MDN states that “The promise fulfills when loading and layout operations of all used fonts are done.” See MDN’s Document: fonts property reference.
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A conceptual page-context readiness check is:
await page.evaluate(() => document.fonts.ready);
This illustrates a browser API readiness gate; it is not a documented Loki configuration key. Use it only in a capture hook or test harness where you control the page object. Storybook’s test-runner documentation describes waitForPageReady(page) for waiting on assets such as fonts before screenshots: Storybook test runner. Loki handles common loading cases in its workflow, but if your fonts load asynchronously or from an external origin, verify readiness in the actual Loki browser target rather than assuming a generic delay is sufficient.
Make captures stable and reviewable
Keep the inputs that determine a screenshot consistent between reference creation and comparison:
- Use the same browser target and Loki configuration.
- Keep viewport, device scale, language strings, font assets, and story state fixed.
- Prefer local or otherwise deterministic content over changing network data.
- Inspect the captured image as well as the difference image; a repeatable fallback-font screenshot is still wrong if the interface is meant to use another font.
Loki says it disables common CSS transitions and animations and requestAnimationFrame by default. It documents limitations including looping animation frames, GIFs, SVG animations, and React Native Animated. Mark unsuitable stories with loki: { skip: true }, or use Loki’s documented asynchronous callback pattern for stories that must signal when rendering is complete. Consult Loki’s flakiness guidance for the configuration supported by your installed release.
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Run Loki in CI without creating accidental baselines
Loki’s CI guide gives a static Storybook example that builds the site and requires existing reference images:
yarn build-storybook && yarn loki --requireReference --reactUri file:./storybook-static
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--requireReference makes a missing baseline fail rather than letting a comparison job silently create one. Check that --reactUri and the static-build command are appropriate for your framework and installed Loki version. Review reference changes locally and commit them intentionally. See Loki’s continuous-integration guide.
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Troubleshoot common screenshot failures
Hindi, Tamil, or other text appears as boxes or unexpected glyphs
- Confirm the font stylesheet and font asset requests succeed in the preview iframe, not just in the manager UI.
- Confirm the chosen family covers the target script and that the CSS actually selects it.
- Check fallback order. A generic fallback may render something while concealing that the intended script-specific face did not load.
Text renders, but line breaks or alignment differ between runs
- Wait for
document.fonts.readyin a custom capture path where available, and verify the actual font request completes in the Loki browser. - Hold viewport, device scale, story state, and content constant; font metrics affect wrapping and element dimensions.
- Look for asynchronous data, animation, or other changing story state before approving a new reference.
Loki cannot connect to Storybook or find the static build
- Start the Storybook server before a development capture, or build the static site before using a file URI.
- Check that the URI points to the output directory your build command actually creates and that the option name is supported by the installed Loki release.
CI fails because a reference image is missing
That is the intended protection from --requireReference. Create and review the baseline in the appropriate development workflow, commit it, and rerun CI; do not remove the flag merely to make an unexplained failure pass.
Or skip the browser setup
For a one-off page capture or an independent screenshot alongside visual tests, ScreenshotNeo offers a GET API that returns an image or PDF. Its clean-shot steps can accept consent banners and remove known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, with response headers indicating the page verdict and billing status. It also provides an MCP server with screenshot, page-info, and PDF tools for AI agents. The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots. Loki remains the tool in this guide for Storybook reference-image comparison.
Example cURL request (replace the target URL and API key):
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See the ScreenshotNeo API documentation for request options. ScreenshotNeo is a website screenshot API and MCP server made by Yorker Media. Sign up free for 1,000 screenshots a month with no card.
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