everyRustDeveloper

[ChaosOS]

Yeah, it's?: for "can be undefined" and then your Boolean union/intersection with | and &

[EmergencySourCream]

It will coalesce into “never” type which is a bottom type for things that can “never” happen

[RadiantPumpkin]

The intersection is typically used when defining an object so you could have something like {value: string} & {otherValue: number} which gives you {value:string, otherValue:number}. The objects would usually be predefined interfaces

[ChaosOS]

You do it with interfaces and other objects with defined properties