depends-txt/dist/peekable.js

A parser module for TeX Live's DEPENDS.txt file format

export function peekable(it) {
    return new PeekableIterator(it);
}
export class PeekableIterator {
    it;
    #peeked = [];
    #done = false;
    constructor(it) {
        this.it = it;
    }
    [Symbol.iterator]() {
        return this;
    }
    next() {
        return this.#peeked.shift() ?? this.#next();
    }
    peekNth(n) {
        while (!this.#done && this.#peeked.length <= n) {
            this.#peeked.push(this.#next());
        }
        return this.#peeked[n] ?? this.#next();
    }
    #next() {
        const result = this.#done
            ? { value: undefined, done: this.#done }
            : this.it.next();
        this.#done = result.done ?? false;
        return result;
    }
}
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