Discriminated Union is not narrowed to never when all types are checked in default case if discriminator field is literal type

[yavanosta]

🔎 Search Terms

switch default discriminated Unions

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about discriminated unions

⏯ Playground Link

https://www.typescriptlang.org/play/?ts=5.7.3#code/KYOwrgtgBAgiCWECGAbAKgTwA7CgbwCgooBjJAFygF4oByM82gGiKgBMB7Ac2rs69oEAvgQLlsuOIlS9CxcTgBcUAAYASPFOToJAOgZCVAblYRgHAO7KAzuQBO8EFxNCoAH3ysFwZes0JtTBxdfkMTYgAjJDsAaxt7R2dhUQAzMBAScngOEFIAC2ASGIAKLGUQYAA3YDsASk95PLtLKAqLKABRO2a7YtounoBCWlrkgjSMrJyoJEzskGKkANRlLVR6uSgAei2oAGEOCCx4FGBrVngUqEXllF1vaioaNZ1ghg3WYhIc6w5T3RQ3Bu0juZkstXCUFcwBQ1lwl2uSxB9wkj2etyCwBC3A+xC+Pz+WMBXGB2l0UViENY0NhuE2XwKRVJ62pomIO32h2Op3OxGsFng5BIeURtxROFxeLIcNUGhemP0FEMik+UoJ-2JzNB5gsVLxeIidmASBikK+SBlfnlelCKhV+vxIF+GqBSLJFJieodhuNptVbGAKSQYBQ5HtDuFhRKbvWkJErA5ABEOGdWhxKN8jidgKx+YLhaLkd5JeaZda3hRw-rvk7CQDXWKwbqzQajSaW9LJBibdwq2ray6STG7h6vfqfe3-YHg6G+wyo1qIdtdgAeAC0a9gdi4kFAlA4VwetBetCg8GsacoFus8C4ICQEVOUHIHCgWGiSDM5BqUAPz9RtAVNUdiCMQIhCEAA

💻 Code

enum AnimalType {
  cat = 'cat',
  dog = 'dog'
}

type Animal = {
  type: `${AnimalType.cat}`;
  meow: string;
} | {
  type: `${AnimalType.dog}`;
  bark: string;
}

function check(p: never) {
  throw new Error('Error!')
}

function action(animal: Animal) {
  // Compiles
  if (animal.type === AnimalType.cat) {
    console.log(animal.meow);
  } else if (animal.type === AnimalType.dog) {
    console.log(animal.bark);
  } else {
    check(animal)
  }

  // Compiles
  switch (animal.type) {
    case `${AnimalType.cat}`:
      console.log(animal.meow);
      break;
    case `${AnimalType.dog}`:
      console.log(animal.bark);
      break;
    default:
      check(animal);
  }

  // Does not compile
  switch (animal.type) {
    case AnimalType.cat:
      console.log(animal.meow);
      break;
    case AnimalType.dog:
      console.log(animal.bark);
      break;
    default:
      check(animal); // <-- Argument of type 'Animal' is not assignable to parameter of type 'never'
  }
}

🙁 Actual behavior

The last example does not compile

🙂 Expected behavior

To my understanding all three examples do exactly the same and all should compile.

Additional information about the issue

No response