Function defaultsDeep

defaultsDeep<T extends Record<string, unknown>>(
...layers: (undefined | Partial<T>)[],
): T
Perform a deep defaults-style merge across plain objects. *
- Only merges plain objects (prototype === Object.prototype).
- Arrays and non-objects are replaced, not merged.
- undefined values are ignored and do not overwrite prior values.
Type Parameters
- T extends Record<string, unknown>
  The resulting shape after merging all layers.
Parameters
- ...layers: (undefined | Partial<T>)[]
  Zero or more partial layers in ascending precedence order.
Returns T
The merged object typed as T.
Example
```
defaultsDeep({ a: 1, nested: { b: 2 } }, { nested: { b: 3, c: 4 } })
=\> { a: 1, nested: { b: 3, c: 4 } }
```
- Defined in src/util/defaultsDeep.ts:46