[TypeScript] Add undefined to Atom definition

[rtritto]

Actual

With

const myAtom = atom<string>()

in VSCode I get

Expected 1 arguments, but got 0.ts(2554)
atom.d.ts(38, 37): An argument for 'read' was not provided

---

Instead, as workaround with

const myAtom = atom<string | undefined>(undefined)

in ESLint I get

error  Do not use useless `undefined`  unicorn/no-useless-undefined

Expected

No Error in VSCode with

const myAtom = atom<string>()

because Atom definition should already use undefined as default value

Related example (React)

const [myState, setMyState] = useState<string>()

[dai-shi]

Thanks for your suggestion.
I'm aware of the limitation.

My workaround has been atom<string | undefined>(undefined) or atom(undefined as string | undefined).

I think adding one more type overload should fix. Would you like to open a PR?

On the other hand, the rationale behind the current design decision is atom<string>() may lead bugs for users, because the undefined type is implicit (only inferred). I wonder how others care about it.

[rtritto]

I opened #2668