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export default interface RLEIterator {    next(n: number): number;}function* RLEGenerator(encoding: number[]) {    for (let i = 0; i < encoding.length; i += 2) {        yield { count: encoding[i], value: encoding[i + 1] };    }}export default function RLEIterator(    encoding: number[],): RLEIterator {    const generator = (RLEGenerator)(encoding);
    let count = 0;    let value = 0;    let done = false;    return {        next(n: number): number {            if (done) return -1;            while (n > 0 && !done) {                if (count) {                    const delta = Math.min(count, n);                    n -= delta;                    count -= delta;                    if (n === 0) return value;                } else {                    const result = generator.next();                    done = !!result.done;                    if (result.done) return -1;                    value = result.value.value;                    count = result.value.count;                }            }            return -1;        },    };}