Is it feasible to create a custom utility type in TypeScript that resembles the Pick-style, allowing for specified keys that may or may not exist on the selected object type? For example:
interface Alpha
{
a: boolean;
b: boolean;
}
type Selected = OptionalSelect<Alpha, 'a' | 'c'>; // { a: boolean }
Achieving this is definitely possible. To accomplish it, we can set the second parameter K to be an extension of PropertyKey. Then, utilize Extarct to filter out properties from keyof T that are present in the union K:
interface Alpha
{
a: boolean;
b: boolean;
}
type OptionalPick<T, K extends PropertyKey> = Pick<T, Extract<keyof T, K>>
type Picked = OptionalPick<Alpha, 'a' | 'c'>;
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