Seeded Random Number Generator

Seedrandom is a JavaScript library that provides seeded pseudorandom number generators (PRNGs). It allows developers to create reproducible sequences of 'random' numbers, which is crucial for deterministic simulations, testing, and specific cryptographic applications (though caution is advised for security-sensitive contexts due to common misuse patterns). The current stable version is 3.0.5, released in late 2019, suggesting a mature but slow-moving maintenance cadence. Key differentiators include its ability to replace the global `Math.random` for debugging or testing purposes, and its inclusion of various PRNG algorithms (such as ARC4, Alea, xor128, Tyche-i) offering different performance characteristics and period lengths. It supports use in web browsers via script tags, as a Node.js module, and as an AMD module. Developers can instantiate independent PRNGs or opt to globally override `Math.random` with a seeded sequence.