Nullable array merge

[jer-sen]

🐞 Bug Report

Describe the bug

With ts-toolbelt@8.0.7 and typescript@4.0.3 O.Merge<{ a: null | number[] }, { a: null | number[] }, 'deep'> doesn't return { a: null | number[] } instead it returns

{
    a: number[] | {
        [x: number]: number;
    } | null;
}

[millsp]

Hi there, sorry about this! I'm closing this issue because it's going to be fixed in the future.
I can't fix it on this branch because the fix introduces breaking API changes and full array merging support. If you want to give it a shot:

npm install typescript@next --save-dev
npm install ts-toolbelt@next --save

Cheers

[jer-sen]

Ok thanks. I gonna wait...

[millsp]

It's a bit far in time (on Nov 17) . We release the next branch according to the TS iteration plan microsoft/TypeScript#40124 since we are continuously upgrading the codebase with the latest ts features. It's generally safe to use ts next. Watch out for the release.

Don't hesitate ask questions if you need some help with types or anything else 💯