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type Literal = string | number | symbol | {}
const Literal = <T extends Literal>(val: T) => val

const Variants = <T extends Literal[]>(...variants: T) => variants
type Variants<T extends Literal[]> = T[number]

const Enum = Variants('a', 'b', {a: Literal('b')})
type Enum = Variants<typeof Enum>