Wether or not to drop undefineds from the resulting merge before return
When set to true it will drop keys that are set to undefined.
When set to a matcher function it will drop only those keys.
To use this functionally elsewhere see the
dropKeys function.
This will happen at the last step
Default
false
OptionalpreferUndefined
preferUndefined?:boolean
When set to true, if any of the sources set something to undefined
Wether or not to drop undefineds from the resulting merge before return When set to true it will drop keys that are set to undefined. When set to a matcher function it will drop only those keys.
To use this functionally elsewhere see the
dropKeysfunction.This will happen at the last step