import { And, Not } from "../boolean";
import { IsUnion } from "../set";
import { Extends } from ".";
/**
 * whether `T` is an instance of a unique symbol.
 * to reinforce the uniqueness of a unique symbol, also asserts that `T` is in fact strictly a unique symbol and is not a union type
 *
 * @since 0.0.2
 *
 * @example
 * declare const a: unique symbol
 * declare const b: unique symbol
 * type e0 = IsUniqueSymbol<typeof a>             // true
 * type e1 = IsUniqueSymbol<symbol>               // false
 * type e2 = IsUniqueSymbol<typeof a | typeof b>  // true
 */
export type IsUniqueSymbol<T> = And<Not<IsUnion<T>>, And<Extends<T, symbol>, Not<Extends<symbol, T>>>>;
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