# TypeAssertNever

`Util.``TypeAssertNever`()
  TypeAssertNever(_x: never): never

  See `TypeAssert` for details.

  This is useful for making the compiler enforce fully-covered switch statements.

  This function unconditionally throws `InternalLogicError`.

  Example:

      switch (x) {
          case Enum.A:
              break;
          case Enum.B:
              break;
          default:
              TypeAssertNever(x); // compiler complains if missing other enum cases
      }

  Parameters

  > _x: never

  Returns: never

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