@silverwind/ioredis-mock/lib/commands/rpoplpush.js

This library emulates ioredis by performing all operations in-memory.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.rpoplpush = rpoplpush;

function rpoplpush(source, destination) {
  if (this.data.has(source) && !(this.data.get(source) instanceof Array)) {
    throw new Error(`Key ${source} does not contain a list`);
  }

  if (this.data.has(destination) && !(this.data.get(destination) instanceof Array)) {
    throw new Error(`Key ${destination} does not contain a list`);
  }

  if (!this.data.has(source) || this.data.get(source).length === 0) {
    return null;
  }

  if (!this.data.has(destination)) {
    this.data.set(destination, []);
  }

  const newSource = this.data.get(source);
  const item = newSource.pop();
  const newDest = this.data.get(destination);
  newDest.unshift(item);
  this.data.set(source, newSource);
  this.data.set(destination, newDest);
  return item;
}