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`and` matches about codemod HOT 1 CLOSED

codemod-js avatar codemod-js commented on August 19, 2024
`and` matches

from codemod.

Comments (1)

j4k0xb avatar j4k0xb commented on August 19, 2024

I'm wondering if there's any interest or past attempts at and

ik this issue is rather old but I wanted to use that a few times

Regarding the intersection return type I initially used this (recursion to loop over the parameters tuple and do type1 & type2 & ... & typeN & unknown:

type IntersectTypeGuards<T> = T extends [infer Head, ...infer Tail]
  ? TypeGuard<Head> & IntersectTypeGuards<Tail>
  : unknown;

(a similar thing could also be used for the or function instead of overloading 5x)

Heres the playground which includes additional checks to match how the ts && works (narrow as much as possible)

from codemod.

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