Function recursiveMerge

recursiveMerge<T extends Record<string, unknown>>(
base: T,
patch: Nullable<RecursivePartial<T>>,
): T
Recursively merges a patch into a base object (deep merge).

Arrays and primitives in patch overwrite base. Nested records are merged recursively. If base[k] is not a plain object (primitive, array, or null), an object-valued patch[k] overwrites it.
Type Parameters
- T extends Record<string, unknown>
  The record type.
Parameters
- base: T
  The base object.
- patch: Nullable<RecursivePartial<T>>
  Partial updates. If nullish, base is returned.
Returns T
A new merged object.
Remarks
- Does not mutate base or patch.
- May return base directly if patch is nullish.
- undefined values in patch are ignored; null values overwrite.
Example
```
const base = { a: 1, b: { c: 2 } };
const patch = { b: { d: 3 }, e: 4 };
recursiveMerge(base, patch); // { a: 1, b: { c: 2, d: 3 }, e: 4 }
```
- Defined in src/data-structure/record.ts:80