3 replies

Extracting T from Option<T> in TypeScript

Hello, I have an Option<T>,

if (isNone(x)) { return ... }

if (isNone(x)) { return ... }

narrows the None case, so TypeScript successfully tell me that x is a

Some<T>

Some<T>

after the

if

if

. How can I extract

? All the helpers I find in the

Option

Option

, like

getOrElse

getOrElse

getOrNull

getOrNull

will give me back

T | null

T | null

T | somethingElse

T | somethingElse

. I just want

and it's safe to do at this point. It might (or not) help to know that

is a union of 2 types

X | Y

X | Y