Remove as any from caseError

[hrajchert]

Currently the caseError implementation needs to return it's value as any cause we get an error of Task<TResult, EResult> is not assignable to the conditional type.

export function caseError<E, TResult, EResult>(
  errorType: Constructor<E>,
  errorHandler: IErrorHandler<E, TResult, EResult>
) {
  return function<RE>(
    err: RE
  ): RE extends E ? Task<TResult, EResult> : Task<TResult, RE | EResult> {
    // If the error is of the type we are looking for (E)
    if (err instanceof errorType) {
      // Transform the error
      return errorHandler(err) as any
    } else {
      // If not, leave as it is
      return Task.reject(err) as any
    }
  }
}

We have to investigate conditional types further, because this base test is currently failing trough
the same problem;

function test<T> (val: T): T extends number ? string : boolean {
  if (typeof val === 'number') {
    val; // This gets infer as T & number, instead of just number
    return 'string'; // this fails because string is not assignable to the conditional.
  } else {
    return false;
  }
}

[hrajchert]

🎉 This issue has been resolved in version 1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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