Type Alias AssertBoolean<T>

AssertBoolean: T

Assert that a type resolves to a boolean.

Type Parameters

T extends boolean
Type that must be true or false

Remarks

Produces a compiler error if the provided type is not a boolean.

Example

type A = AssertBoolean< true >;    // ✓
type B = AssertBoolean< string >;  // ✗ TS error