I'm trying to restrict an array's elements to specific keys of an interface:
interface Foo {
bar: string;
baz: number;
foo: string;
}
type SelectedKeysArray<T, K extends keyof T> = Pick<T, K>[];
const selectedKeys: SelectedKeysArray<Foo, "bar" | "baz"> = ["bar", "baz"]; // Error: Type 'string' is not assignable to type 'Pick<Foo, "bar" | "baz">'
If you want to achieve this task effortlessly, you can utilize the Extract utility type in TypeScript. Here's an example:
type AllItems = keyof Items
type SelectedItems = Extract<keyof Items, 'selectedItem' | 'anotherSelectedItem'>
const allItemsValid: AllItems[] = ['selectedItem', 'anotherSelectedItem', 'item']
const allItemsInvalid: AllItems[] = ['selectedItem', 'invalid'] // Type '"invalid"' is not assignable to type '"selectedItem" | "anotherSelectedItem" | "item"'
const selectedItemsValid: SelectedItems[] = ['selectedItem', 'anotherSelectedItem']
const selectedItemsInvalid: SelectedItems[] = ['selectedItem', 'item'] // Type '"item"' is not assignable to type '"selectedItem" | "anotherSelectedItem"'.
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