Array filter on array does not correct types returned from map

[alzalabany]

Search Terms:
Type Array filter

Code

type T = { id:number };
const obj = [{id:1},{id:2},{id:3}]
const ids = [1,2,5];
const error:T[] = ids.map(id=>obj[id] ? obj[id] : false).filter(Boolean);

Expected behavior:
const error should be T[] only;

Actual behavior:
// error type is T | false

Related Issues:
7657

[MartinJohns]

Duplicate of #32834, #31164, #24063, #16655. Was implemented by #29955, and broken by #31515.

Search terms used: filter boolean

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.

[OmgImAlexis]

@MartinJohns since this was broken by #31515 can we get a new issue open to track this? Otherwise you're just going to keep closing issues as duplicates.

[MartinJohns]

@OmgImAlexis I'm not a member of the TypeScript team, so I have no say in this. But.. why get a new issue? There are existing issues about this, see my comment from before: #35988 (comment)

[OmgImAlexis]

The first two issues you linked were closed, I had assumed the others were too.