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export default class StringIterator {    #gen: Generator<string, void, unknown>;    #result: IteratorResult<string, void>;    constructor(compressedString: string) {        this.#gen = RLEGenerator(compressedString);        this.#result = this.#gen.next();    }    next() {        const value = this.#result.value;        if (typeof value === "undefined") return "";        this.#result = this.#gen.next();        return value;    }    hasNext() {        return !this.#result.done;    }}function* RLEGenerator(encoding: string) {    for (let i = 0; i < encoding.length; i += 2) {        const count = Number(encoding[i + 1]);        for (let j = 0; j < count; j++) {            yield encoding[i];        }    }}