TS2368

error TS2368: Type parameter name cannot be ‘number’.

Broken Code ❌

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export interface SimpleNumberIndicator<number> {
  update(price: T): T;
}

Fixed Code ✔️

The easiest way to fix the error is to make age optional as well:

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export interface SimpleNumberIndicator<T = number> {
  update(price: T): T;
}