Avoid allowing generic types to be overwritten in Typescript

Is there a way to ensure that the layoutKey remains as type L (specifically IOfficialLevelLayouts) even when passing in other values? Every time I provide a value, it seems to override the desired type.

https://i.sstatic.net/YfH6k.png https://i.sstatic.net/cJgSI.png

The current structure of ITableEntity is as follows:

interface ITableEntity<T, F, L> {
  entity: BaseEntity<T, F, L>;
  filterDefault?: Partial<T>;
  actions?: IAction[];
  layoutKey?: L;
  onRowClick?: (item: T) => void;
}

Any suggestions on how to enforce the layoutKey to always be of type L (IOfficialLevelLayout)?

typescripttypescript-generics

Answer №1

After some troubleshooting, I was able to resolve the issue with this solution:

type NoInfer<T> = [T][T extends any ? 0 : never];

Now, the ITableEntity interface is updated as follows:

interface ITableEntity<T, F, L> {
  entity: BaseEntity<T, F, L>;
  filterDefault?: Partial<T>;
  actions?: IAction[];
  layoutKey?: NoInfer<L>;
  onRowClick?: (item: T) => void;
}

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