Auto create type guards for generated types

[rodriciru]

Description

Make sense to auto generate type guards for the generated types?

[mrlubos]

Who's an example output you'd be looking for?

[rodriciru]

First, I must say I'm a beginner, so maybe I didn't get correctly something, that's why I asked if it makes sense.

Some structure guard check. I think this will be suffice for check interfaces at runtime

export type ProblemDetails = {
  type?: null | string;
  title?: null | string;
  status?: null | number | string;
  detail?: null | string;
  instance?: null | string;
};

export function isProblemDetails(obj: unknown): obj is ProblemDetails {
  if (typeof obj !== 'object' || obj === null) return false;
  const o = obj as Record<string, unknown>;

  if (
    ('type' in o && o.type !== null && typeof o.type !== 'string') ||
    ('title' in o && o.title !== null && typeof o.title !== 'string') ||
    ('status' in o &&
      o.status !== null &&
      typeof o.status !== 'number' &&
      typeof o.status !== 'string') ||
    ('detail' in o && o.detail !== null && typeof o.detail !== 'string') ||
    ('instance' in o && o.instance !== null && typeof o.instance !== 'string')
  ) {
    return false;
  }

  return true;
}

if (isProblemDetails(e.error)) {
  const tituloToast = 'Error del servidor:'
  const descToast = e.error?.detail || 'Error desconocido.'
  toast.add({ title: tituloToast, description: descToast, color: 'error' })
}