.array().items() dynamic type item type schema causes issues in typescript

[SimonSchick]

Runtime

node

Runtime version

24

Module version

18

Last module version without issue

17.x

Used with

hapi

Any other relevant information

It seems that a lot of expressions where the schema for array.items is dynamically chosen makes typescript really unhappy.

What are you trying to achieve or the steps to reproduce?

import joi from 'joi';

joi.array().items(Math.random() > 0.5 ? joi.string() : joi.number());

What was the result you got?

No overload matches this call.
  Overload 1 of 7, '(a: SchemaLikeWithoutArray<number>): ArraySchema<number[]>', gave the following error.
    Argument of type 'StringSchema<string> | NumberSchema<number>' is not assignable to parameter of type 'SchemaLikeWithoutArray<number>'.
      Type 'StringSchema<string>' is not assignable to type 'SchemaLikeWithoutArray<number>'.
        Type 'StringSchema<string>' is not assignable to type 'StringSchema<number>'.
          Type 'string' is not assignable to type 'number'.
  Overload 2 of 7, '(...types: SchemaLikeWithoutArray<number>[]): ArraySchema<any[]>', gave the following error.
    Argument of type 'StringSchema<string> | NumberSchema<number>' is not assignable to parameter of type 'SchemaLikeWithoutArray<number>'.
      Type 'StringSchema<string>' is not assignable to type 'SchemaLikeWithoutArray<number>'.
        Type 'StringSchema<string>' is not assignable to type 'StringSchema<number>'.
          Type 'string' is not assignable to type 'number'.ts(2769)

What result did you expect?

No error.

[Marsup]

@SimonSchick can you check if everything is OK with the types in #3087?

[SimonSchick]

Yea that seems to be fine.