Type alias IsUnknown<T, $O>

IsUnknown<T, $O>: $SpecialType<T, {
    $any: $ResolveBranch<T, $O, [$Any, $Else]>;
    $else: $ResolveBranch<T, $O, [$Else]>;
    $never: $ResolveBranch<T, $O, [$Never, $Else]>;
    $unknown: $ResolveBranch<T, $O, [$Then]>;
}>

🎭 predicate

Validate if T is exactly unknown.

Type Parameters

T
$O extends IsUnknown.$Options = {}

Type declaration

$any: $ResolveBranch<T, $O, [$Any, $Else]>
$else: $ResolveBranch<T, $O, [$Else]>
$never: $ResolveBranch<T, $O, [$Never, $Else]>
$unknown: $ResolveBranch<T, $O, [$Then]>

Example

type R = IsUnknown<unknown> // true

type R = IsUnknown<number> // false
type R = IsUnknown<never> // false

🔢 customize

Filter to ensure T is exactly unknown.

Example

type R = IsUnknown<unknown, { selection: 'filter' }> // unknown

type R = IsUnknown<number, { selection: 'filter' }> // never
type R = IsUnknown<never, { selection: 'filter' }> // never

🔢 customize

Use unique branch identifiers to allow precise processing of the result.

Example

type R = IsUnknown<unknown, $SelectionBranch> // $Then
type R = IsUnknown<string, $SelectionBranch> // $Else

Type alias IsUnknown<T, $O>

Type Parameters

T

$O extends IsUnknown.$Options = {}

Type declaration

$any: $ResolveBranch<T, $O, [$Any, $Else]>

$else: $ResolveBranch<T, $O, [$Else]>

$never: $ResolveBranch<T, $O, [$Never, $Else]>

$unknown: $ResolveBranch<T, $O, [$Then]>

Example

Example

Example

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