Type Alias IsLiteral<T, Then, Else>

IsLiteral: number extends T
    ? Else
    : string extends T
        ? Else
        : boolean extends T
            ? Else
            : symbol extends T ? Else : bigint extends T ? Else : Then

Validate if specified type is a scalar literal.

🎭 predicate

Type Parameters

T extends number | boolean | bigint | string | symbol
Then = true
Else = false

Example

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

Type Alias IsLiteral<T, Then, Else>

Type Parameters

Example

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