type-plus/esm/predicates/literal.d.ts

Provides additional types for TypeScript.

/**
 * Validate if specified type is a scalar literal.
 *
 * 🎭 *validate*
 *
 * @example
 * ```ts
 * type R = IsLiteral<string> // false
 * type R = IsLiteral<number> // false
 * type R = IsLiteral<boolean> // false
 * type R = IsLiteral<bigint> // false
 * type R = IsLiteral<symbol> // false
 *
 * type R = IsLiteral<'a'> // true
 * type R = IsLiteral<1> // true
 * type R = IsLiteral<true> // true
 * type R = IsLiteral<1n> // true
 * type R = IsLiteral<typeof someSymbol> // true
 * ```
 */
export type IsLiteral<T extends number | boolean | bigint | string | symbol, Then = true, Else = false> = number extends T ? Else : string extends T ? Else : boolean extends T ? Else : symbol extends T ? Else : bigint extends T ? Else : Then;
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