Compilation error on index.d.cts

[JbIPS]

Bug Report

On a project with deepmerge-ts as a depency and skipLibCheck to false, this error pops at compile time

> tsc -p .

node_modules/deepmerge-ts/dist/node/index.d.cts:437:127 - error TS2344: Type '{ 
[I in keyof Ts]: Ts[I] extends { key: infer Key extends PropertyKey; values: inf
er Values extends readonly unknown[]; optional: infer O extends boolean; } ? Cre
ateRecordForKeyFromMeta<Key, Values, O, Fs, M> : never; }' does not satisfy the 
constraint 'readonly unknown[]'.
  Types of property 'length' are incompatible.
    Type 'Ts["length"] extends { key: infer Key extends PropertyKey; values: inf
er Values extends readonly unknown[]; optional: infer O extends boolean; } ? Cre
ateRecordForKeyFromMeta<Key, Values, O, Fs, M> : never' is not assignable to typ
e 'number'.
      Type '{ [x: string]: unknown; [x: number]: unknown; [x: symbol]: unknown; 
} | { [x: string]: unknown; [x: number]: unknown; [x: symbol]: unknown; }' is no
t assignable to type 'number'.
        Type '{ [x: string]: unknown; [x: number]: unknown; [x: symbol]: unknown
; }' is not assignable to type 'number'.

437 type CreateRecordFromMeta<Ts, Fs extends DeepMergeFunctionsURIs, M> = Ts ext
ends ReadonlyArray<unknown> ? TupleToIntersection<{
                                                                                
                                                  ~
438     [I in keyof Ts]: Ts[I] extends {
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
... 
442     } ? CreateRecordForKeyFromMeta<Key, Values, O, Fs, M> : never;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
443 }> : never;

Expected behavior

It should compile

Actual behavior

It does not

Steps to reproduce

• npm i deepmerge-ts@latest (7.0.3 is also affected)
• ensure in tsconfig.json that you have "skipLibCheck": false
• `tsc

Proposed changes

Adding "skipLibCheck": false on the main project is a workaround, but I find it a bit hacky, thus this report

[fatihaziz]

could you reproduce the problem with code example?
It seems your code has too complicated types, let me see how you use the deepmerge function like

[fatihaziz]

sometimes what you need to do is using casting types for merging object with different types,
for example

types ObjectTypeA {
 prop_a: boolean
}

types ObjectTypeB {
 prop_b: boolean
}

types ObjectTypeC {
 prop_a?: boolean
 prop_b?: boolean 
}

let someobject_a: ObjectTypeA = {
prop_a: false
}

let someobject_b: ObjectTypeA = {
prop_b: false
}

// dont ❌
let someobject_c = deepmerge(someobject_a, someobject_b) // may throw type error, since the type between the two object not the same.

// todo ✅
let someobject_c: ObjectTypeC = deepmerge(someobject_a as ObjectTypeC, someobject_b as ObjectTypeC) // will fix it, and still get the correct type.

[RebeccaStevens]

I've updated how the types are compiled for this project. Hopefully, as a consequence, this has also fixed this issue. Let me know if you still have to issue.

Also, sorry for the long delay in my reply.