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Where is the dot coming from? If you know the dict is not null you would write a["b"], so it makes perfect sense that the new syntax is a?["b"]. The `?` applies to whatever is to the left of it. a?.Method() has a dot because we would write a.Method(). TypeScript designers made a mistake or had other constraints probably.

Maybe because in JS/TS, `a ? ["b"]` is a valid syntax, so they had to insert the dot to parse properly.

That would look strange IMHO. Why wouldn't it be a.["b"] then?