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