Troubleshooting 'Either' Function Error in TypeScript Code

Hello everybody. What's wrong with this code?

function eitherFromRandom(random: number): Either.Either<'fail', number> {
  return random > 0.5 ? Either.right(random) : Either.left('fail')
}

function eitherFromRandom(random: number): Either.Either<'fail', number> {
  return random > 0.5 ? Either.right(random) : Either.left('fail')
}

function eitherFromRandom(random: number): Either.Either<'fail', number> {
  return random > 0.5 ? Either.right(random) : Either.left('fail')
}

function eitherFromRandom(random: number): Either.Either<'fail', number> {
  return random > 0.5 ? Either.right(random) : Either.left('fail')
}

Here's the error I'm getting:

    return random > 0.5 ? Either.right(random) : Either.left('fail')
    ~~~~~~

    return random > 0.5 ? Either.right(random) : Either.left('fail')
    ~~~~~~

    return random > 0.5 ? Either.right(random) : Either.left('fail')
    ~~~~~~

    return random > 0.5 ? Either.right(random) : Either.left('fail')
    ~~~~~~

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