Bug: AssignAction type error when using exactOptionalPropertyTypes: true

[SandroMaglione]

XState version

XState version 5

Description

An assign action reports a type error when using exactOptionalPropertyTypes: true in tsconfig.json.

Expected result

It should be possible to use exactOptionalPropertyTypes: true with xstate.

Actual result

Reproduction

https://stackblitz.com/edit/vitejs-vite-lbw4wa?file=src%2Fmain.ts

Additional context

exactOptionalPropertyTypes allows for more type-safety. It is also recommended when using @effect/schema.

[SandroMaglione]

@Andarist is there any workaround for this? Do you know if it's possible to disable exactOptionalPropertyTypes for a specific file?

[davidkpiano]

@Andarist is there any workaround for this? Do you know if it's possible to disable exactOptionalPropertyTypes for a specific file?

I updated XState and TypeScript in this codebase and it seems to work fine: https://stackblitz.com/edit/vitejs-vite-lbw4wa?file=package.json,src%2Fmain.ts

Can you double-check that everything's working on your end?

[SandroMaglione]

@davidkpiano it seems to be working now when only actions are defined.

When instead I add also actors (as I need in my codebase) the issue comes back: https://stackblitz.com/edit/vitejs-vite-aesqqz?file=package.json,src%2Fmain.ts

[Andarist]

@Andarist is there any workaround for this?

I wasn't yet able to figure out a workaround. It's definitely possible to fix this on our side but it requires prioritization and time.

Do you know if it's possible to disable exactOptionalPropertyTypes for a specific file?

No, it's a global setting.