megahal.js

MegaHAL is a simple chatterbot.

This is a JavaScript implementation of the MegaHAL algorithm, more specifically a direct, nearly one-to-one port of kranzky/megahal. Major credits to kranzky, without whom this wouldn’t exist.

Features & Caveats

• TypeScript types are provided within the package.

• A Sooth stochastic predictive model is also implemented almost one-to-one and may later be extracted into a separate package.

• Both are licensed under the Unlicense license, in the spirit of the original packages. So basically, do whatever you want with it, but no warranty!

• Training a personality is rather slow and may take a few seconds to complete. Anyone is more than welcome to suggest any performance improvements, I am sure many can be made.

• It is not currently usable as a CLI application, but you can embed it into your own Node.js code.

Installation

Use your favorite package manager:

pnpm install megahal.js

yarn add megahal.js

npm install megahal.js

Usage

To start you must import the main class from the module.

import MegaHAL from 'megahal.js'

Using MegaHAL

Create a new instance of MegaHAL, and provide the personality you would like to use, using the name.

If you omit the personality name, default will be used.

Use .reply(line) to get a response for a a given line of text, and also learn from that line in the process.

You can use .train(filename) or .train(lines) to manually train the bot on the go.

import { MegaHAL } from 'megahal.js'

const bot = new MegaHAL('default')

const input = 'hello!'
const message = bot.reply(input)

Loading personalities

MegaHAL comes with several personalities pre-loaded. You can list them using MegaHAL.list().

To add a custom personality, use the addPersonality method.

To switch personalities on an existing instance, use the become method.

// list all personalities

console.log(MegaHAL.list())

// load a custom personality
MegaHAL.addPersonality('name', [
  'line 1',
  'line 2',
  // ...
])

// switch personality on-the-fly
import { MegaHAL } from 'megahal.js'
const bot = new MegaHAL('default')
bot.become('sherlock')

Continuous learning

You can save & load your continuous learning to a file, at your discretion so do it as often as you feel appropriate.

import { MegaHAL } from 'megahal.js'

const bot = new MegaHAL('default')

// save bot:
await bot.save('/path/to/file.zip')

// load bot at a later time:
await bot.load('/path/to/file.zip')