const range = (from: number, to: number) => Array.from((function* () {
    let i = from;
    while(i <= to)
        yield i++;
})())

/** or even */

const fromGenerator = <T>(gen: () => Iterable<T>) => Array.from(gen())

const range = (from: number, to: number) => fromGenerator(function* () {
    let i = from;
    while(i <= to)
        yield i++;
})