Random Number Predictor

A TypeScript library that predicts the next Math.random() number in V8 JavaScript engine (Chrome, Node.js, Edge, etc.).

Importants Notes

This predictor only works with the V8 JavaScript engine as it specifically targets its xoshiro128+ PRNG implementation. It will not work with other JavaScript engines like SpiderMonkey (Firefox) or JavaScriptCore (Safari).

In addition, to use it in the browser, the browser must accept SharedArrayBuffer

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer#security_requirements

Installation

npm install predict-next-random

To use the library in the browser, you can use the CDN version: <script src="https://unpkg.com/predict-next-random@latest/dist/index.global.js"></script> and use the predictNextRandom global variable.

Usage

The predictNextRandom function accepts an array of random numbers and predicts the next one in the sequence:

import predictNextRandom from 'predict-next-random';

// Using default sequence (automatically generates 5 random numbers)
const prediction = await predictNextRandom();
console.log('Next random number will be:', prediction, Math.random());

// Using custom sequence (must be 5 consecutive Math.random() numbers)
const customSequence = [
  0.1537274509826705,
  0.2825553692132683,
  0.730500319996316,
  0.2035670016395259,
  0.13580711831105652
];
const customPrediction = await predictNextRandom(customSequence);
console.log('Next random number will be:', customPrediction); // 0.4663416602317585

Requirements

Must be run in a V8 JavaScript engine (Node.js, Chrome, Edge, etc.)
Sequence must contain 5 consecutive Math.random() numbers
Numbers must be in the exact order they were generated

Return Value