Typescript types: nullable and defined return any

[mdismer]

Describe the bug

nullable() and defined() on object and array schema return any.

Expected behavior

Both functions return the correct type (ObjectSchema / ArraySchema)

Platform:

• Version 0.32.8

[Bartmr]

This can be anything: a miss-type, conflicting declarations, a value that cannot be inferred.

Can you give a use-case?

[mdismer]

Yes here is a simple example:

import * as yup from 'yup'

interface Foo {
  test: string
}

interface Bar {
  foo: Foo | null
  foos: Foo[] | null
}

const fooSchema: yup.SchemaOf<Foo> = yup.object({
  test: yup.string().defined()
})

const barSchema: yup.SchemaOf<Bar> = yup.object({
  foo: fooSchema.defined().nullable(),
  foos: yup.array().of(fooSchema.defined()).defined().nullable()
})

Both fooSchema.defined() and array().of(fooSchema) return any

Happens which pretty much any object schema.

[bart-opplane]

Opened pull request #1256 to fix this for arrays

[mdismer]

@bart-opplane Thanks for the pull request. Do you have an idea how to fix it for objects?

[Bartmr]

@mdismer It's me, @bart-opplane , but from my personal account. No idea. To be honest, the typings in this library are super confusing.