Type alias $SelectionBranch<$O>

$SelectionBranch<$O>: {
$else: $Else;
$then: $Then;
} & $O

🧰 type util

Branch option for selection logic. It allows finely customizing the behavior of your type.

Using this as the default value of your $Options is the recommended best practice.

This encourage consumer of your type to use conditional type to avoid performance issues.

Type Parameters

$O extends $SelectionOptions = {}

Type declaration

$else: $Else
$then: $Then

Example

type YourType<
  T,
  $Options extends YourType.$Options = YourType.$Branch
> = ...

namespace YourType {
  export type $Options = $SelectionOptions
  export type $Branch = $SelectionBranch
}

type R = YourType<T> extends infer R
  ? R extends $Then ? HandleThen
  : R extends $Else ? HandleElse
  : never

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