Combined refine/transform

Hello,

I’m using transform() to base64-decode a value. I’m bumping up against this requirement from the docs:

⚠️ Transformation functions must not throw. Make sure to use refinements before the transformer to make sure the input can be parsed by the transformer.

To satisfy this requirement, I am doing this:

const schema = string().refine(isBase64).transform(d => Buffer.from(d, 'base64'));

function isBase64(data: string): boolean {
  try {
    Buffer.from(data, 'base64');
  } catch {
    return false;
  }
  return true;
}

This implementation is a little silly since I am base64-decoding the object just to check whether I can base64-decode it.

Is there some way to memoize the Buffer object created in refine call, so that I don’t have to double-decode?

[colinhacks]

This is a known limitation. Refinements and transforms will be combined into a single concept at some point in the near future. I’ll post here when that happens. 👍

[jvliwanag]

should we keep this open? it’s a very common use case.