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

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

"use strict";

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

function append(key, value) {
  if (!this.data.has(key)) {
    this.data.set(key, '');
  }

  if (value instanceof Buffer) {
    this.data.set(key, Buffer.concat([Buffer.from(this.data.get(key)), value]));
  } else {
    this.data.set(key, this.data.get(key) + value);
  }

  return this.data.get(key).length;
}