bind:value={fn, fn} expects incorrect types

[gyzerok]

Describe the bug

It seems like Svelte is using type inference for binds which ends up with incorrect typings.

In practice for <input type="number" /> the values are of type number | null, but it shows string in the following example.

This ends up with runtime errors down the road.

Reproduction

REPL

Logs

System Info

Svelte 5.25.3, TypeScript 5.8.2

Severity

annoyance

[dummdidumm]

This is a limitation of the type system. Even if we were to be able to make it related to the input type better, it would be any at best, because it's impossible to type that for type=number the value type is different than for type=text

[gyzerok]

@dummdidumm got it, but this leaves me wondering if it is a good idea than to transform values for number input to numbers behind the scenes. In my case I wasn't expecting this at all and discovered the issue after looking at a strange runtime crashes