[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [NotImplementedError](./js-utils.notimplementederror.md) > [(constructor)](./js-utils.notimplementederror._constructor_.md)
## NotImplementedError.(constructor)
Constructs a new instance of the `NotImplementedError` class
Signature:
```typescript
constructor(msg?: string, ...nested: Array);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| msg | string | |
| nested | Array<Error> | |