[feat suggestion]: partial/nullish/nullable object with default values

[jakecodev]

Hi, I found partial saves a lot of code using optional in object. It is great! But only partial works for object but could not set default values for object' keys.

If I want a schema with default values '', it would be:

v.object({
  age: v.optional(v.string(), ''),
  role: v.optional(v.string(), 'visitor'),
  mobile: v.optional(v.string(), ''),
  // less readable when validation get complex
})

1. It would be cleaner if we can set default values at one time using v.partial

v.partial(
  v.object({
    age: v.string(),
    role: v.string(),
    mobile: v.string(),
  }),
  '',
)
// { age: '', role:'', mobile:'' ...}

or with some exceptions

v.partial(
  v.object({
    age: v.number(),
    role: v.string(),
    mobile: v.string(),
    avatar: v.string(),
  }),
  '',
  {
    role: 'visitor',
    avatar: 'xxxxxxx.jpg',
  },
)
// { age: '', role:'visitor', mobile:'xxxxxxx.jpg' ...}

2. It would be great to extend v.nullable/nullish with the same functionality for objects.

This is just a suggestion. I believe this would be a feat that other users would love. Thank you again for this great library!

[fabian-hiller]

Your idea is great, but there are a few problems. If your object contains entries with different data types, it is not possible to define the default value with a single value, and your "exceptions" solution makes the API very complicated. Also, partial allows you to specify which keys should be optional via the second argument. Therefore, we can't define the default value with the second argument.