26 lines
456 B
Markdown
26 lines
456 B
Markdown
---
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title: preLayout
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---
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The `preLayout` lifecycle hook runs just before the pattern layout is
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calculated.
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This is a good place to do any business that might change the layout but relies on all the parts having been drafted
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## Signature
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```js
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null hook(Pattern pattern)
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```
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## Example
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```js
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pattern.on('preLayout', pattern => {
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// Mutate the pattern object here
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}
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```
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## Notes
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The `postLayout` hook is rarely used, but it's there if you need it.
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