Function isPlainObject

isPlainObject<T>(
value: T,
allowNullProto?: boolean,
): value is T extends Function | readonly unknown[] ? never : T & object
Checks if a value has a prototype of Object.prototype or null. To disallow a null prototype, pass false to allowNullProto.
Type Parameters
- T
Parameters
- value: T
  The value to check.
- allowNullProto: boolean = true
  Whether to allow a null prototype. Defaults to true.
Returns value is T extends Function | readonly unknown[] ? never : T & object
true if the check passes, false otherwise.
Example
Basic usage
```
isPlainObject({}) // true
isPlainObject(Object.create(Object.prototype)) // true
isPlainObject(Object.create(null)) // true

isPlainObject([]) // false
isPlainObject(Object.create({})) // false

class Foo {}
isPlainObject(new Foo()) // false
```
When allowNullProto is false:
```
// previously returned true
isPlainObject(Object.create(null), false) // false
```
- Defined in is/isPlainObject/index.ts:31