When working with TypeScript, it's easy to create a type-safe array of object keys like so:
export type Keys<T> = [keyof T][];
export const keys = <T>(o: T): Keys<T> => Object.keys(o) as any;
const k = keys(a);
However, the challenge arises when trying to create a similar type for the values:
export type Values<T> = [T][keyof T];
// Using 'keyof T' to index type '[T]' throws an error.
To access the values in T, use T directly instead of [T]:
type Values<T> = T[keyof T][]; // or Array<T[keyof T]>
type Foo = { a: number, b: string };
type FooValues = Values<Foo>; // (string | number)[]
[T] represents a tuple with a single element of type T, so attempting to access it using T's keys results in an error.
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