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Issue Description

Given the following code, I would expect it to lint successfully:

constmaybe=<T>(v:T):T|void=>vconsta=maybe({key1:{key2:maybe({i:1,}),},})?.key1.key2?.i//           ^// 9:14  error  Unnecessary optional chain on a non-nullish value  @typescript-eslint/no-unnecessary-condition

In my reproduction the second optional chain is removed if I run with--fix but then TypeScript errors with the following:

> tsc --noEmitindex.ts:9:15 - error TS2339: Property 'i' does not exist on type 'void | { i: number; }'.  Property 'i' does not exist on type 'void'.9 })?.key1.key2.i                ~Found 1 error in index.ts:9

I also want to note that this behavior does not occur if the value could benull onlyvoid. It successfully lints if I change the return ofmaybe toT | null.

In my reproduction I also tried to narrow it down as far as I could and found that these examples lint successfully:

// This lints fineconstb=maybe({key1:maybe({i:1,}),})?.key1?.i// So does thisconstc={key1:{key2:maybe({i:1,}),},}.key1.key2?.i

Reproduction Repository Link

https://gist.github.com/lukekarrys/979ea0dd68b52937e9a257b4d2c9c293

Repro Steps

git clone https://gist.github.com/lukekarrys/979ea0dd68b52937e9a257b4d2c9c293npm installnpm run lint

Versions