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25 lines
799 B
Plaintext
25 lines
799 B
Plaintext
---
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title: 'previewHead'
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sidebar:
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order: 17
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title: previewHead
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---
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Parent: [main.js|ts configuration](./main-config.mdx)
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Type: `(head: string) => string`
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Programmatically adjust the [preview `<head>`](../../configure/story-rendering.mdx#adding-to-head) of your Storybook. Most often used by [addon authors](../../addons/writing-presets.mdx#ui-configuration).
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<Callout variant="info" icon="💡">
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If you don't need to programmatically adjust the preview head, you can add scripts and styles to [`preview-head.html`](../../configure/story-rendering.mdx#adding-to-head) instead.
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</Callout>
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For example, you can conditionally add scripts or styles, depending on the environment:
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{/* prettier-ignore-start */}
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<CodeSnippets path="main-config-preview-head.md" />
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{/* prettier-ignore-end */}
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