docs: use type declaration for type-safe when declare initialState

[Seung-wan]

i think Type Declaration is type-safe than Type Assertion.

interface CounterState { value: number } // Type Declaration const initialState: CounterState = { value: 0 } const initialState: CounterState = { value: 0, id: 1 } // Error: ... // Type Assertion const initialState = { value: 0 } as CounterState const initialState = { value: 0, id: 1 } as CounterState // Not error, but id is not type of CounterState.

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[phryneas]

No, we show that pattern very deliberately as TypeScript's flow analysis otherwise sometimes gives weird results. See #827

If you want to carry this forward, we'd be happy for a PR that adds a satisfies, but the as is required.

-const initialState = { value: 0 } as CounterState +const initialState = { value: 0 } satisfies CounterState as CounterState

[phryneas]

Thanks :)

If you have the time: Could you maybe go over the docs and look for other places that we can add that?
I know we have that in a bunch of places, and it would be great if we could keep it consistent.

[Seung-wan]

@phryneas
Okay. I think I'll just send out a new PR when I'm done.