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Re:All I Want for Christmas Is These Seven TypeScript Improv... by commotionfever on Monday December 26, 2022 @12:05AM (#34134769)
for the situation of filter, map, then knowing x is present, there is

https://www.npmjs.com/package/ts-is-present

that particular case is a small snippet but the package also comes with helpers for reaching into objects to do a similar thing

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