Type Alias BoolOr<A, B>

BoolOr: TypeEq<A, true> extends true
    ? TypeEq<B, true> extends true
        ? true
        : TypeEq<B, false> extends true ? true : never
    : TypeEq<A, false> extends true
        ? TypeEq<B, true> extends true
            ? true
            : TypeEq<B, false> extends true ? false : never
        : never

Performs a logical OR operation on two boolean literal types A and B. This is the type-level equivalent of the JavaScript || operator. Returns true when at least one operand is true.

Type Parameters

A extends boolean
The first boolean literal type (true or false).
B extends boolean
The second boolean literal type (true or false).

Returns

true if either A or B (or both) is true, false otherwise.

Example

type T_T = BoolOr<true, true>;   // true
type T_F = BoolOr<true, false>;  // true
type F_T = BoolOr<false, true>;  // true
type F_F = BoolOr<false, false>; // false

// Useful for fallback conditions
type HasAnyFlag<T> = T extends { flagA: infer A, flagB: infer B }
  ? A extends boolean
    ? B extends boolean
      ? BoolOr<A, B>
      : A
    : B extends boolean
      ? B
      : false
  : false;

Type Alias BoolOr<A, B>

Type Parameters

Returns

Example

Settings