spreadify: add a universal iterator to any array-like object

spreadify.once.js

/** Alternative spreadify implementation with `...spreadify.once` */
const spreadify = {
  /** Always spread */
  *[Symbol.iterator](): any {
    delete this[Symbol.iterator];
    yield* this.once[Symbol.iterator].call(this);
    this[Symbol.iterator] = this.once[Symbol.iterator];
  },
  once: {
    /** Spread once */
    *[Symbol.iterator](): any {
      delete this[Symbol.iterator];
      // eslint-disable-next-line no-restricted-syntax
      for (const item of Array.from(this)) {
        yield item;
      }
    },
  },
};

export default spreadify;

spreadify.ts

/**
 * spreadify: add a universal iterator to any array-like object.
 *
 * @example
 * const list = [...{...nonIterableArrayLike, ...spreadify}];
 * for (const item of list) {
 *   item.doStuff();
 * }
 */
const spreadify = {
  /** General array-like iterator */
  *[Symbol.iterator](): any {
    const iterator = this[Symbol.iterator];
    delete this[Symbol.iterator];
    // eslint-disable-next-line no-restricted-syntax
    for (const item of Array.from(this)) {
      yield item;
    }
    this[Symbol.iterator] = iterator;
  },
};

export default spreadify;